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COMSPHERE 392x P LUS MODEMS MODELS 3920 P LUS AND 3921 P LUS INST ALLA TION AND OPERA TION MANUAL Document No. 3920-A2-GN31-30 November 1996.
COMSPHERE 392x Plus Modems A November 1996 3920-A2-GN31-30 COMSPHERE 392x Plus Modems Models 3920 Plus and 3921 Plus Installation and Operation Manual 3920-A2-GN31-30 4th Edition (November 1996) Chang.
Safety Instructions B 3920-A2-GN31-30 November 1996 Important Safety Instructions 1. Read and follow all warning notices and instructions marked on the product or included in the manual. 2. This product is intended to be used with a three-wire grounding type plug – a plug which has a grounding pin.
COMSPHERE 392x Plus Modems C November 1996 3920-A2-GN31-30 Notices .
i 3920-A2-GN31-30 November 1996 T able of Contents Preface Objectives and Reader Assumptions vii . . . . . . . . . . . . . . . . . . . . . . . . . How to Use This Manual vii . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Related Documents viii .
COMSPHERE 392x Plus Modems ii November 1996 3920-A2-GN31-30 Poll List Branch 3-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Control Branch 3-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able of Contents iii 3920-A2-GN31-30 November 1996 List of Figures Figure Page 1-1 Model 3920 Plus Standalone Singleport and Multiport Modems 1-3 . . . . . . . . . . . . . . . 1-2 Model 3921 Plus Singleport Modem 1-5 . . . . . . . . . . . . . . . . .
COMSPHERE 392x Plus Modems iv November 1996 3920-A2-GN31-30 List of T ables T able Page 1-1 392x Plus Operational Modes 1-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 T echnical Specifications for 392x Plus Modems 1-13 .
T able of Contents v 3920-A2-GN31-30 November 1996 T able Page B-6 Online Operation B-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7 Mux Operation B-5 . . . . . . . . . . . . . . . . . . .
vii 3920-A2-GN31-30 November 1996 Preface Objectives and Reader Assumptions This manual describes how to install and operate the COMSPHERE r Model 3920 Plus standalone and Model 3921 Plus carrier -mounted modems. Users of this manual must have a basic understanding of modems and their operation.
COMSPHERE 392x Plus Modems viii November 1996 3920-A2-GN31-30 Related Documents 3000-A2-GA31 COMSPHERE 3000 Series Carrier , Installation Manual 3610-A2-GZ45 3600 Hubbing Device, Featur e Number 3600-.
1-1 3920-A2-GN31-30 November 1996 Introduction Overview 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . COMSPHERE 392x Plus Models 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 392x Plus Modems 1-2 November 1996 3920-A2-GN31-30 COMSPHERE 392x Plus Models The COMSPHERE 392x Plus modem is available in the following four models: • Model 3920 Plus standalone singleport modem (model no. 3920-A1-41x). • Model 3920 Plus standalone multiport modem (model no.
Introduction 1-3 3920-A2-GN31-30 November 1996 DIAGNOSTIC CONTROL P ANEL LCD AND KEYP AD ST A TUS INDICA TORS SPEAKER POWER SUPPL Y POWER CORD 496-14684-01 LEASED Model 3920 Plus Singleport and Multip.
COMSPHERE 392x Plus Modems 1-4 November 1996 3920-A2-GN31-30 Model 3921 Plus Carrier-Mounted Singleport Modem The Model 3921 Plus is a carrier-mounted singleport modem (Figure 1-2) capable of either 4-wire/2-wire leased-line or dial operation. The modem installs into a COMSPHERE 3000 Series Carrier , occupying a single slot.
Introduction 1-5 3920-A2-GN31-30 November 1996 F ACEPLA TE 496-14178a-04 EIA232/V .24 EDGE CARD CONNECTOR FUTURE USE BACK CONNECTOR PLA TE V .35 (3600/3500) RS366A/V .25 (3800) EIA232/V .24 TXD RXD RTS CTS DSR DTR LSD 103 104 105 106 107 108 109 Pwr Alrm T est Dial RI Busy Serv SQ Status Front Panel 3921 Plus 142 125 Spkr EIA232/V .
COMSPHERE 392x Plus Modems 1-6 November 1996 3920-A2-GN31-30 49614423a-0 3 F ACEPLA TE EDGE CARD CONNECTORS PORT 3 PORT 4 PORT 1 PORT 2 3921 Plus TXD RXD RTS CTS DSR DTR LSD Pwr Alrm T est Dial RI Busy Serv SQ Status Front Panel Spkr 142 125 103 104 105 106 107 108 109 13 24 Port BACK CONNECTOR PLA TES DTE B DTE A DTE B DTE A Figure 1-3.
Introduction 1-7 3920-A2-GN31-30 November 1996 392x Plus Operational Modes The 392x Plus operational modes determine how your modem performs in various applications. These operational modes are determined by your modem model and the selected configuration options.
COMSPHERE 392x Plus Modems 1-8 November 1996 3920-A2-GN31-30 • Network management system (NMS) support through the COMSPHERE 6800 or 6700 Series NMS using Advanced Diagnostic protocol (ADp). • Automatic and manual backup with standby capabilities for 4-wire/2-wire leased-line applications.
Introduction 1-9 3920-A2-GN31-30 November 1996 Dual-Leased Backup Dual-Leased Backup is available in all 392x Plus modems. It enables a 2-wire leased line to be used as the backup facility instead of the normal 2-wire dial line.
COMSPHERE 392x Plus Modems 1-10 November 1996 3920-A2-GN31-30 The CCITT standard for V .34 modulation includes dial- or leased-line operation. For proper leased-line operation, one modem must be designated as the answer modem while the other modem must be designated as the originate modem.
Introduction 1-1 1 3920-A2-GN31-30 November 1996 Government Requirements and Equipment Return Certain governments require that instructions pertaining to modem connection to the public switched telephone network be included in the installation and operation manual.
COMSPHERE 392x Plus Modems 1-12 November 1996 3920-A2-GN31-30 9. If you experience trouble with this equipment, please contact your sales or service representative (as appropriate) for repair or warranty information.
Introduction 1-13 3920-A2-GN31-30 November 1996 T echnical Specifications T able 1-2 shows the technical specifications for the 392x Plus modems. T able 1-2 (1 of 2) T echnical Specifications for 392x.
COMSPHERE 392x Plus Modems 1-14 November 1996 3920-A2-GN31-30 T able 1-2 (2 of 2) T echnical Specifications for 392x Plus Modems Specifications Description POWER CONSUMPTION Model 3920 Plus Singleport.
2-1 3920-A2-GN31-30 November 1996 Modem Installation Overview 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 392x Plus Modem Package 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 392x Plus Modems 2-2 November 1996 3920-A2-GN31-30 For the carrier-mounted models • Installation instructions • Model 3921 Plus modem • One (singleport) or two (multiport) connector plates with two DB-25-S edge card connectors on each plate If any hardware components are damaged, notify your service representative.
Modem Installation 2-3 3920-A2-GN31-30 November 1996 Model 3920 Plus Modem Installation Before installing your standalone modem, make sure your installation site is clean and well-ventilated. Allow space around the modem for installing cables and telephone cords, and make sure the modem is located within reach of the ac power outlet.
COMSPHERE 392x Plus Modems 2-4 November 1996 3920-A2-GN31-30 8-POSITION, 8-CONDUCTOR PLUG FOR LEASED-LINE NETWORK OPERA TION 6-POSITION, 4-CONDUCTOR PLUG FOR PERMISSIVE DIAL NETWORK OPERA TION DB-25-P.
Modem Installation 2-5 3920-A2-GN31-30 November 1996 Power Supply Connection Use the following steps to connect the modem to an ac power outlet: 1. Make sure the modem is powered OFF . 2. Insert the power supply’ s 8-pin DIN connector into the modem’ s back panel dc power receptacle, labeled PWR (Figure 2-1).
COMSPHERE 392x Plus Modems 2-6 November 1996 3920-A2-GN31-30 Network Management System Connection Use the following steps to connect the modem to the network management system (NMS) interface: 1. Insert the sub-miniature, 4-conductor modular plug of the 3600 Hubbing Device into the jack labeled NMS (Figure 2-1).
Modem Installation 2-7 3920-A2-GN31-30 November 1996 SDU is required when the modems in the carrier are controlled by an NMS, or when multiple carriers in a cabinet configuration are to be controlled by a single shared diagnostic control panel (SDCP).
COMSPHERE 392x Plus Modems 2-8 November 1996 3920-A2-GN31-30 3000 SERIES CARRIER MODEL 3921 Plus MUL TIPORT MODEM LA TCH CIRCUIT CARD GUIDES 495-14708 SDU MODEL 3921 Plus SINGLEPORT MODEM LA TCH CIRCUIT CARD GUIDES SDU 3000 SERIES CARRIER Figure 2-3.
Modem Installation 2-9 3920-A2-GN31-30 November 1996 If the Model 3921 Plus modem is to communicate with an installed SDCP , install the modem as described above and perform the following steps: 1.
COMSPHERE 392x Plus Modems 2-10 November 1996 3920-A2-GN31-30 6. Once you have determined that the modem is installed properly and completed its power -up self-test, rotate the circuit pack lock until it covers the faceplate latch (Figure 2-4) and tighten the retention screw on the circuit pack lock.
Modem Installation 2-1 1 3920-A2-GN31-30 November 1996 Removing and Replacing the Model 3921 Plus Modem CAUTION When removing the Model 3921 Plus modem from the carrier , always use a ground strap when handling the modem. Always store the Model 3921 Plus modems in an antistatic bag when it is removed from the carrier .
COMSPHERE 392x Plus Modems 2-12 November 1996 3920-A2-GN31-30 configuration, then you must change the factory setting using either the modem’ s DCP (as described in the following sections) or the A T command set.
3-1 3920-A2-GN31-30 November 1996 DCP Operation Overview 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diagnostic Control Panels 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 392x Plus Modems 3-2 November 1996 3920-A2-GN31-30 T est Branch 3-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Abort 3-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DCP Operation 3-3 3920-A2-GN31-30 November 1996 Model 3920 Plus Diagnostic Control Panel The diagnostic control panel (DCP) of the Model 3920 Plus modem (Figure 3-1) contains status indicators, pushbutton-type keys, an LCD, and speaker grill.
COMSPHERE 392x Plus Modems 3-4 November 1996 3920-A2-GN31-30 TXD RXD RTS CTS DSR DTR LSD Pwr Alrm T est Dial RI Busy Serv SQ Status Front Panel Spkr 142 125 103 104 105 106 107 108 109 13 24 Port 3921.
DCP Operation 3-5 3920-A2-GN31-30 November 1996 T able 3-1 (1 of 2) 392x Plus DCP LEDs Label Color Indicates Pwr green Power has been applied to the modem. Alrm red Flashing – A major alarm has been detected in a remote 392x Plus modem. ON – A major alarm has been detected in the local modem.
COMSPHERE 392x Plus Modems 3-6 November 1996 3920-A2-GN31-30 T able 3-1 (2 of 2) 392x Plus DCP LEDs Label Indicates Color Port* 1,2,3,4 (3921Plus multiport only) green ON – The selected port* is one of the mux ports (either 1, 2, 3, or 4). OFF – The port* is not selected.
DCP Operation 3-7 3920-A2-GN31-30 November 1996 Diagnostic Control Panel Operation The 392x Plus modem’ s diagnostic control panel (DCP) is the user interface to all functions used to configure and control the modem. In addition to the status LEDs, this interface includes the liquid crystal display (LCD) and keypad (Figure 3-3).
COMSPHERE 392x Plus Modems 3-8 November 1996 3920-A2-GN31-30 Other Indicators Other indicators may turn on depending on existing conditions, such as error detection, informational alerts, and warnings. These indicators appear on the top or bottom line of the LCD.
DCP Operation 3-9 3920-A2-GN31-30 November 1996 F1 F2 F3 Keys Function keys F1, F2, and F3 select the LCD choice that appears above the function key . Refer to the Summary section in Chapter 4 for the exception. If the displayed LCD choice spans more than one function key , then any of the function keys select that choice.
COMSPHERE 392x Plus Modems 3-10 November 1996 3920-A2-GN31-30 The menu tree contains the following branches: Status — Used to monitor the current status of the VF line and DTE interface as well as view the identity of the modem. Configure — Used to change and save the modem’ s configuration options.
DCP Operation 3-1 1 3920-A2-GN31-30 November 1996 T op-Level Menu Status and Operational Messages Access to all menu tree branches from the DCP begins at the T op-Level menu, the head of the menu hierarchy .
COMSPHERE 392x Plus Modems 3-12 November 1996 3920-A2-GN31-30 T able 3-3 (2 of 3) T op-Level Menu Status Status Indicates Message Call Failure Busy Signal The answering modem is busy . Delayed Number { As a result of failed call attempts, this number can not be called at this time.
DCP Operation 3-13 3920-A2-GN31-30 November 1996 T able 3-3 (3 of 3) T op-Level Menu Status Status Indicates Message Call Disconnect A TH Disconnect The modem has disconnected due to an A TH command. Bad Lines Disc The modem has disconnected because the lines do not support the modulation and/or data rate selected.
COMSPHERE 392x Plus Modems 3-14 November 1996 3920-A2-GN31-30 Messages listed in T able 3-4 are common operational messages that occur during modem operation. These messages normally appear on the second line of the LCD. T able 3-4 Common Operational Messages Common Operational Message Indicates Please W ait.
DCP Operation 3-15 3920-A2-GN31-30 November 1996 The T op-Level menu’ s main branches appear on the LCD in the order of Status, Configure, Control, T est, Call Setup, T alk/Data, Security , and Remote.
COMSPHERE 392x Plus Modems 3-16 November 1996 3920-A2-GN31-30 The following provides information about the Quick Configuration LCD display . a Displays the network position of the modem. The letter C indicates this is a control modem, and T indicates this is a tributary modem.
DCP Operation 3-17 3920-A2-GN31-30 November 1996 Status Branch The Status branch of the T op-Level menu allows you to view the current status of the leased-line or dial connection, the identity (for example, serial number and model number) of your equipment, and the DTE interface.
COMSPHERE 392x Plus Modems 3-18 November 1996 3920-A2-GN31-30 Device Health and Status (DeviceHS) DeviceHS provides a ‘ ‘snapshot” of current modem alarms which are active at the time the DeviceHS function is selected. T o access DeviceHS from the Status branch, make the following selection: F1 Status: > DeviceHS VF F2 F3 Select DeviceHS.
DCP Operation 3-19 3920-A2-GN31-30 November 1996 T able 3-6 (2 of 3) Health and Status Messages T ype Indicates Message Status Subtree T runcate Downstream health and status information has been truncated because it overflowed system limits. There is a large amount of health and status information in the subnetwork.
COMSPHERE 392x Plus Modems 3-20 November 1996 3920-A2-GN31-30 T able 3-6 (3 of 3) Health and Status Messages T ype Indicates Message Security Database Reset The security database has been reset (passwords erased). Password Protect Security password protection is enabled.
DCP Operation 3-21 3920-A2-GN31-30 November 1996 Displaying VF Conditions F1 Status:VF Display Clear F2 F3 To display VF conditions, select Display from the Status:VF screen. F1 Status:VF > SigQual=Excelent F2 F3 If the modem is receiving a signal, the signal quality appears on the LCD’ s bottom line.
COMSPHERE 392x Plus Modems 3-22 November 1996 3920-A2-GN31-30 EchoFreqOff Echo Frequency Of fset displays the frequency of fset of the far end echo. This parameter appears for V .
DCP Operation 3-23 3920-A2-GN31-30 November 1996 F1 VF Counter Clear Command Complete F2 F3 The message Command Complete appears on the LCD’ s bottom line indicating the VF Counters are cleared. T o exit VF and remain in the Status Branch, press the key .
COMSPHERE 392x Plus Modems 3-24 November 1996 3920-A2-GN31-30 DTE DTE displays the state and/or activity of the following interface leads: LSD, DTR, DSR, TST , TXD, RXD, R TS, and CTS.
DCP Operation 3-25 3920-A2-GN31-30 November 1996 V .34 When running V .34 modulation, this function displays information about the modem’ s receiving and transmitting data rate, symbol rate, transmitting level, and asymmetric rate. NOTE The V .34 status display is available only when the modem is configured for V .
COMSPHERE 392x Plus Modems 3-26 November 1996 3920-A2-GN31-30 Backup The Status Backup function displays the configuration of the modem’ s current operating line facility and the configuration and condition of the inactive line. NOTE The modem’s rear panel has two line interface jacks: LEASE and DIAL (see Figure 2-1 in Chapter 2).
DCP Operation 3-27 3920-A2-GN31-30 November 1996 T able 3-7 provides information about the Status Backup screens. The first column lists all possible configurations for the modem’ s currently active line. The second column lists all possible configurations for the modem’ s inactive lines.
COMSPHERE 392x Plus Modems 3-28 November 1996 3920-A2-GN31-30 Options The Options Status function displays all optional firmware features currently installed in the modem.
DCP Operation 3-29 3920-A2-GN31-30 November 1996 F1 Record Status Display Clear F2 F3 To display sequence faults, select Display . F1 Record Number 1 Modem O.K. F2 F3 The LCD displays the first sequence fault field. (Sequence fault fields range from 1 to 8 and are identified by a number in the upper right corner .
COMSPHERE 392x Plus Modems 3-30 November 1996 3920-A2-GN31-30 Select Nxt to scroll through the entries in the Service Log. T o exit this function and remain in the Status branch, press the key . T o exit and return to the T op-Level menu, press the key .
DCP Operation 3-31 3920-A2-GN31-30 November 1996 F1 Leased:28.8 PList Control F2 F3 Press the key until PList appears. Select PList. W ithin a network link, a control modem can communicate with a tributary modem by using the tributary modem’ s network management address for polling functions.
COMSPHERE 392x Plus Modems 3-32 November 1996 3920-A2-GN31-30 Select Nxt to scroll through the entries in the Active or Skip poll lists. T o exit this function and remain in the PList Display branch, press the key . T o exit and return to the T op-Level menu, press the key .
DCP Operation 3-33 3920-A2-GN31-30 November 1996 T o implement Change, select the appropriate function (Active, Delete, or Skip). (For Skip, you will need to press the key until Skip appears.) F1 Poll List:yyyyyy E n t x xx F2 F3 The function field (yyyyyy) displays the function selected (Active, Delete, or Skip).
COMSPHERE 392x Plus Modems 3-34 November 1996 3920-A2-GN31-30 The message Command Complete appears on the LCD to indicate that the tributary modem will be added to the control modem’ s poll list. T o exit this function and remain in the PList branch, press the key .
DCP Operation 3-35 3920-A2-GN31-30 November 1996 F1 Poll List:Acquir Num Acquired yyy F2 F3 The number field (yyy) indicates the total number of devices acquired for the poll list. T o exit this function and remain in the PList branch, press the key .
COMSPHERE 392x Plus Modems 3-36 November 1996 3920-A2-GN31-30 Speaker Speaker allows you to make temporary adjustments to the modem’ s speaker volume. Upon a reset, speaker volume returns to its configured setting. For more information on speaker settings, refer to the Misc section in Chapter 4.
DCP Operation 3-37 3920-A2-GN31-30 November 1996 Reset Reset causes the modem to stop operation and perform a complete program restart. The modem begins the power -up test sequence that ends with the T op-Level menu displayed on the LCD.
COMSPHERE 392x Plus Modems 3-38 November 1996 3920-A2-GN31-30 F1 Data Stream Port1 Disable F2 F3 The port field (for example, Port1) displays the selected port. The available Data Stream action (Disable or Enable) appears on the second line of the LCD beside the port field.
DCP Operation 3-39 3920-A2-GN31-30 November 1996 F1 Select DS Port > All F2 F3 To change the data stream on all ports again, press the F1 key . or T o exit this function and remain in the Control branch, press the key . T o exit and return to the T op-Level menu, press the key .
COMSPHERE 392x Plus Modems 3-40 November 1996 3920-A2-GN31-30 Press the F1 key until the appropriate digital interface appears. Select the appropriate interface by pressing the corresponding function key .
DCP Operation 3-41 3920-A2-GN31-30 November 1996 F1 Control: RemoveMakeBusy F2 F3 Press any function key to select RemoveMakeBusy . The message Command Complete appears on the LCD. Service Line/Disconnect Service Line The Service Line/Disconnect Service Line is only available in Models 3921-B1-001 and 3021-B1-01 1.
COMSPHERE 392x Plus Modems 3-42 November 1996 3920-A2-GN31-30 T o disconnect the modem from the service line and resume normal operation, press the key (returning to Control branch). From the Control branch, press the key until DiscServiceLine appears.
DCP Operation 3-43 3920-A2-GN31-30 November 1996 F1 Control: Download_Code F2 F3 Press the key until Download_Code appears. Press any function key to select Download_Code. The DwnLoadSoftware screen appears. F1 DwnLoadSoftware > Clone_Remote F2 F3 Press any function key to select Clone_Remote.
COMSPHERE 392x Plus Modems 3-44 November 1996 3920-A2-GN31-30 From the Choose DLL T ype screen, press the F1 key to select SC_Clone to request the transfer of an exact copy of the tributary modem’ s firmware to the VF connected control modem.
DCP Operation 3-45 3920-A2-GN31-30 November 1996 Clone Remote in Multipoint Configurations A T rellis Multipoint (TMp) control modem can be used to download firmware to just one tributary modem ( Single ) or to all of its tributary modems ( Multiple ).
COMSPHERE 392x Plus Modems 3-46 November 1996 3920-A2-GN31-30 Cloning a Single TMp Remote F1 Choose DLL T ype > Single Multiple F2 F3 Press the F1 key to select Single Clone Remote. F1 Choose Address: E n t x xx F2 F3 The address field (xxx) displays the network management address of the modem that receives the download.
DCP Operation 3-47 3920-A2-GN31-30 November 1996 Cloning a Multiple TMp Remote F1 Choose DLL T ype > Single Multiple F2 F3 Press the F3 key to select Multiple Clone Remote. After completing this action, proceed to the next section titled Implementing a Clone Remote Operation .
COMSPHERE 392x Plus Modems 3-48 November 1996 3920-A2-GN31-30 Implementing a Clone Remote Operation W ARNING The modem begins a transfer of its own program to the remote modem. This process takes the communication link out-of-service for a period of time depending on the data rate of the link.
DCP Operation 3-49 3920-A2-GN31-30 November 1996 If unsuccessful, the modem remains in the Download T ransfer mode. The LCD’ s top line displays RemClone Failed and the bottom line displays one of the following messages: Incompat Modulat The modems are connected, but are using a modulation scheme other than V .
COMSPHERE 392x Plus Modems 3-50 November 1996 3920-A2-GN31-30 Automatic Firmware Download New releases may be available for the 392x Plus modems. The latest 392 xPlus firmware is available at no char ge from the Automatic Firmware Download Center . Refer to page A in the front of this document for contact information.
DCP Operation 3-51 3920-A2-GN31-30 November 1996 VF Thresholds Update The VF Thresholds Update function allows you to set the thresholds that determine the H e a l th a n d St a t u s alarm conditions for the VF parameters. R ef e r t o T ab l e 3 - 8 i n t h i s s e c tion for VF thresholds and their valid ranges and default values.
COMSPHERE 392x Plus Modems 3-52 November 1996 3920-A2-GN31-30 NOTE Note that a warning ( ) appears on the second line of the screen if you enter an invalid VF threshold (out of range). Y ou cannot save your edits until all thresholds are within their valid range.
DCP Operation 3-53 3920-A2-GN31-30 November 1996 If the edited VF thresholds are valid, the Save command stores them into nonvolatile memory . When the Save completes, the message Save Completed appears. F1 Save VF Thresh Thd Out of Range F2 F3 If the edited VF threshold is invalid (out of range), the error message Thd Out of Range appears.
COMSPHERE 392x Plus Modems 3-54 November 1996 3920-A2-GN31-30 T able 3-8 (2 of 2) V alid Ranges for VF Thresholds VF Thresholds Default V alues V alid Ranges Far Echo 0 –38 dBm Above –20 dBm Frequ.
DCP Operation 3-55 3920-A2-GN31-30 November 1996 To access the T est branch from the T op-Level menu, make the following selections: F1 Leased:28.8 Control T est F2 F3 Press the key until T est appears. Select T est. Abort Abort ends any test that is in progress and brings the modem back to the normal mode of operation.
COMSPHERE 392x Plus Modems 3-56 November 1996 3920-A2-GN31-30 Self Self performs an internal self-test of the modem, which takes less than a minute to complete. The modem must be of fline; otherwise, Invalid Command appears. W ARNING When this test is run in Remote mode, it causes the Remote mode session to be lost.
DCP Operation 3-57 3920-A2-GN31-30 November 1996 Loc Analog Loop This test is not available when using V .34 modulation in Multiport mode. Loc Analog Loop performs a local analog loopback (CCITT V .54 Loop 3), Figure 3-4, that verifies modem operation as well as the connection between the DTE and modem.
COMSPHERE 392x Plus Modems 3-58 November 1996 3920-A2-GN31-30 NOTE The test delays 15 to 30 seconds to allow any outstanding network management messages to propagate before the VF channel is interrupted by the test. The message Started appears on the LCD, and the T est LED lights for the duration of the test.
DCP Operation 3-59 3920-A2-GN31-30 November 1996 T o access Rem_Digital_Loop from the T est branch, make the following selections: F1 T est: Rem_Digital_Loop F2 F3 Press the key until Rem_Digital_Loop appears. Press any function key to start this test.
COMSPHERE 392x Plus Modems 3-60 November 1996 3920-A2-GN31-30 Loc Digital Loop Loc Digital Loop is issued by a local modem and forces it to loopback any data received from the remote modem (Figure 3-6 ). (This test operates the same as a CCITT V .54 Loop 2 except it is issued at your modem.
DCP Operation 3-61 3920-A2-GN31-30 November 1996 This screen does not appear in Singleport mode. F1 T est:P1:Dig Loop Started F2 F3 The message Started appears on the LCD and the T est LED lights. The port field (for example, P1 for Port 1) displays the port that is currently selected.
COMSPHERE 392x Plus Modems 3-62 November 1996 3920-A2-GN31-30 Figure 3-8. Pattern T est and Digital Loopback T est Figure 3-9. End-to-End Pattern T est T o access Pattern from the T est branch, make the following selections: F1 T est: < Pattern F2 F3 Press the key until Pattern appears.
DCP Operation 3-63 3920-A2-GN31-30 November 1996 F1 Pick T est Port > Port1 Port2 F2 F3 Select the appropriate port by pressing the corresponding F key . Press the key to scroll other ports into view . The Pick T est Port screen does not appear in Singleport mode.
COMSPHERE 392x Plus Modems 3-64 November 1996 3920-A2-GN31-30 Sub-Network Health and Status Branch The Sub-Network Health and Status (SubHS) function is not available on multipoint tributary modems or with certain modulations (V .29, V .33, V .22bis, and V .
DCP Operation 3-65 3920-A2-GN31-30 November 1996 When you select SubHS, xxx Displays the network management address of the downstream modem selected. yyyyyy Displays the status of the downstream modem. This message is updated every several seconds to display the latest status.
COMSPHERE 392x Plus Modems 3-66 November 1996 3920-A2-GN31-30 T o access the Call Setup branch from the T op-Level menu, make the following selections: F1 Leased:28.
DCP Operation 3-67 3920-A2-GN31-30 November 1996 F1 DialDirectory:01 Off Hook F2 F3 The Call Setup status Off Hook appears during the connection process. If the connection is successful, the modem is online and one of the Normal Operation status messages (T able 3-3) appears on the LCD.
COMSPHERE 392x Plus Modems 3-68 November 1996 3920-A2-GN31-30 Answer For dial backup applications, Answer allows the modem to go of f-hook, generate an answer tone, and begin the handshaking process with the calling modem. Use the Answer function when the Auto-Answer Ring Count configuration option is disabled.
DCP Operation 3-69 3920-A2-GN31-30 November 1996 Under normal backup conditions, when a problem occurs on the primary leased line, the modems establish a connection over the backup network. F1 Call Setup: Dial Standby F2 F3 When this occurs, the Dial Standby function appears on the LCD.
COMSPHERE 392x Plus Modems 3-70 November 1996 3920-A2-GN31-30 Change Directory Change Directory allows you to enter or modify telephone numbers. The modem has nonvolatile memory locations that allow you to store up to 24 telephone numbers.
DCP Operation 3-71 3920-A2-GN31-30 November 1996 Entering T elephone Numbers and Dial Command Modifiers into Directory Locations The following example uses an empty directory location for describing how to enter a telephone number . If you want to change an existing telephone number in any of the 24 directory locations, follow the same procedures.
COMSPHERE 392x Plus Modems 3-72 November 1996 3920-A2-GN31-30 T able 3-9 V alid Dial Command Modifiers Dial command modifiers are parameters entered in the dial command string which specify how , when, and what number to dial. The following is a list of parameters the 392x Plus modems recognize: T — T one (DTMF) dial.
DCP Operation 3-73 3920-A2-GN31-30 November 1996 F1 Number Status Nxt 01:Allowed F2 F3 Select Nxt to display other directory locations. The status of a directory location can be: No Number The directory location is empty . Allowed The number in this directory location may be dialed at this time.
COMSPHERE 392x Plus Modems 3-74 November 1996 3920-A2-GN31-30 The following sections describe the uses of the T alk/Data function. Manual Dialing When the Remote Modem is Configured for Auto-Answer NOTE On the remote modem, the Line Current Disconnect configuration option (refer to the Line Dialer section in Chapter 4) must be set to Disable.
DCP Operation 3-75 3920-A2-GN31-30 November 1996 Manual Dialing When the Remote Modem is Configured for Manual Answer NOTE On both modems, the Line Current Disconnect configuration option (refer to the Line Dialer section in Chapter 4) must be set to Disable.
COMSPHERE 392x Plus Modems 3-76 November 1996 3920-A2-GN31-30 Remote Branch The Remote branch of the T op-Level menu allows you to control the remote modem’ s DCP using the local modem’ s DCP . This function allows you to change configuration options and control test functions in a remote modem.
DCP Operation 3-77 3920-A2-GN31-30 November 1996 Remote DCP access is accomplished using either the primary or secondary channel (if available) of the VF line. Using the primary channel gives a much faster response time due to the higher data rate, but it also interrupts data flow because primary data is stopped when Remote mode is active.
COMSPHERE 392x Plus Modems 3-78 November 1996 3920-A2-GN31-30 For T rellis Multipoint (TMp) modems (control or tributary), you must specify the remote access password of the modem that will be accessed by the Remote function. The following display does not appear in point-to-point modems.
DCP Operation 3-79 3920-A2-GN31-30 November 1996 F1 Leased:28.8 Control ExitRem F2 F3 If the remote modem accepts the password and the entry is successful, the T op-Level menu of the remote modem appears on the local modem’ s LCD.
DCP Operation 3-81 3920-A2-GN31-30 November 1996 Diagnostic Control Panel Access NOTE This page of the manual is self supporting and can be removed to prevent unwanted knowledge of the DCP security access selections. Use the DCP security access function to “lock” the DCP of any 392x Plus modem and prevent unwanted user access.
4-1 3920-A2-GN31-30 November 1996 DCP Configuration Overview 4-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Configure Branch 4-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 392x Plus Modems 4-2 November 1996 3920-A2-GN31-30 • Factory is a read-only (unchangeable) configuration area containing six sets of predefined configuration options labeled Sync Leased , Async Leased , TMp (T rellis Multipoint), Async Dial , Sync Dial , and UNIX Dial .
DCP Configuration 4-3 3920-A2-GN31-30 November 1996 Configure Branch The Configure branch of the T op-Level menu contains all of the modem’ s configuration options which determine how the modem operates. These configuration options are accessed by scrolling down and across various levels of the Configure branch.
COMSPHERE 392x Plus Modems 4-4 November 1996 3920-A2-GN31-30 The Configure branch consists of the following three levels: • Ld EditAr ea frm . Allows the selection of the Active (Operating), Active (Saved), Customer 1, Customer 2, and Factory configuration areas.
DCP Configuration 4-5 3920-A2-GN31-30 November 1996 F1 Ld Fact Preset: > Sync_Leased F2 F3 Select Sync_Leased. F1 Choose Mode: Answer Originate F2 F3 Select Answer .
COMSPHERE 392x Plus Modems 4-6 November 1996 3920-A2-GN31-30 F1 StrapsWhenDisc > Nxt No_Change F2 F3 F1 RemAccssPasswrd: N x t 0 0000000 F2 F3 Select Nxt until RemAccssPasswrd appears. F1 RemAccssPasswrd: N x t 1 0000000 F2 F3 Select the F2 ( ) key to increment password values.
DCP Configuration 4-7 3920-A2-GN31-30 November 1996 To save the new password to a configuration area, make the following selections: F1 RemAccssPasswrd: N x t 12345678 F2 F3 Press the key to scroll up (twice). F1 Choose Function Edit Save F2 F3 Select Save.
COMSPHERE 392x Plus Modems 4-8 November 1996 3920-A2-GN31-30 Configuration T ables Each modem operates in either the Multiport or Singleport mode depending on the modem’ s configuration (refer to 392xPlus Operational Modes in Chapter 1 ) .
DCP Configuration 4-9 3920-A2-GN31-30 November 1996 DTE Interface DTE Dialer Line Dialer AutoAnswerRing# Dialer T ype DialT one Detect Blind Dial Paus BusyT one Detect "," Pause T ime NoAnsw.
COMSPHERE 392x Plus Modems 4-10 November 1996 3920-A2-GN31-30 DTE Interface — Multiport Mode l The DTE Interface configuration options contain EIA-232-D (CCITT V .24) and asynchronous character format information essential for maintaining a connection and for transmitting data between the DTEs and the modem.
DCP Configuration 4-1 1 3920-A2-GN31-30 November 1996 T able 4-1 (2 of 9) DTE Interface Configuration Options — Multiport Mode l Bakup_TXClk_Src: Internal Nxt Internal RXC_Loop Port1 Port2 Port3 Port4 This configuration option only appears when Dual_Leased_Ln is configured for Enable.
COMSPHERE 392x Plus Modems 4-12 November 1996 3920-A2-GN31-30 T able 4-1 (3 of 9) DTE Interface Configuration Options — Multiport Mode l Port Rate Sub-Group (One for Each Port) NOTE: The Port Rate Sub Group configuration options are not available in Digital Bridge mode.
DCP Configuration 4-13 3920-A2-GN31-30 November 1996 T able 4-1 (4 of 9) DTE Interface Configuration Options — Multiport Mode l Rate at 7200 Nxt Disable 7200 4800 2400 1200 Rate at 7200. When the modem rate is 7200 bps the port rate will be as selected by this configuration option (Disable or 7200 to 1200).
COMSPHERE 392x Plus Modems 4-14 November 1996 3920-A2-GN31-30 T able 4-1 (5 of 9) DTE Interface Configuration Options — Multiport Mode l Async OverSpeed: 1.0 % End 1.0 % 2.3 % This configuration option only appears when Async/Sync Mode is configured for Async.
DCP Configuration 4-15 3920-A2-GN31-30 November 1996 T able 4-1 (6 of 9) DTE Interface Configuration Options — Multiport Mode l RTS Action: Stndrd_RS232 Nxt Stndrd_RS232 Ignore Sim_Cntl_Car Request-to-Send Action. RTS is a signal from the DTE indicating the DTE has data to send.
COMSPHERE 392x Plus Modems 4-16 November 1996 3920-A2-GN31-30 T able 4-1 (7 of 9) DTE Interface Configuration Options — Multiport Mode l RTS/CTS Delay: 0msec Nxt 0msec 10msec 50msec 150msec 600msec 5 Request-to-Send/Clear-to-Send Delay .
DCP Configuration 4-17 3920-A2-GN31-30 November 1996 T able 4-1 (8 of 9) DTE Interface Configuration Options — Multiport Mode l CT1 1 1 Control: Disable Nxt Disable Enable This configuration option does not appear when V .34 is enabled for a leased or dial line.
COMSPHERE 392x Plus Modems 4-18 November 1996 3920-A2-GN31-30 T able 4-1 (9 of 9) DTE Interface Configuration Options — Multiport Mode l Extend Main Ch.: Disable Nxt Disable Enable Primary data can only be extended one link. Extend Main Channel. Supports extended diagnostics.
DCP Configuration 4-19 3920-A2-GN31-30 November 1996 Line Dialer — Multiport Mode l The Line Dialer configuration options establish parameters used by the modem to answer or originate calls.
COMSPHERE 392x Plus Modems 4-20 November 1996 3920-A2-GN31-30 T able 4-2 (2 of 3) Line Dialer Configuration Options — Multiport Mode l “,” Pause Time: 2sec Nxt 2sec 4sec 6sec 8sec 10sec 20sec Pause T ime. Determines the number of seconds the modem pauses when it encounters a comma (,) in the dial command string.
DCP Configuration 4-21 3920-A2-GN31-30 November 1996 T able 4-2 (3 of 3) Line Dialer Configuration Options — Multiport Mode l No Carrier Disc: 2sec Nxt 2sec Disable 5sec 10sec 20sec No Carrier Disconnect. If the modem no longer receives carrier from the remote modem, it disconnects the call.
COMSPHERE 392x Plus Modems 4-22 November 1996 3920-A2-GN31-30 Dial Line — Multiport Mode l The Dial Line configuration options are used to configure the modem for operation over dial lines.
DCP Configuration 4-23 3920-A2-GN31-30 November 1996 T able 4-3 (2 of 2) Dial Line Configuration Options — Multiport Mode l Dial Tx Level: Permissv(–9) Nxt Permissv(–9) –10 –1 1 –12 –13 –14 –15 –16 –17 –18 –19 –20 –21 –22 –23 –24 –25 –26 –27 –28 –29 –30 –31 –32 Dial T ransmit Level.
COMSPHERE 392x Plus Modems 4-24 November 1996 3920-A2-GN31-30 Leased Line — Multiport Mode l The Leased Line configuration options only appear when the Sync Leased factory preset template is selected. They are used to configure the modem for operation over leased lines.
DCP Configuration 4-25 3920-A2-GN31-30 November 1996 T able 4-4 (2 of 3) Leased Line Configuration Options — Multiport Mode l V32bis Override: Disable Nxt Disable 2400 This configuration option is ignored unless Leased-Line Rate is 4800(V32b). V .32bis Override.
COMSPHERE 392x Plus Modems 4-26 November 1996 3920-A2-GN31-30 T able 4-4 (3 of 3) Leased Line Configuration Options — Multiport Mode l SpecialStandby: Disable Nxt Disable Enable This configuration o.
DCP Configuration 4-27 3920-A2-GN31-30 November 1996 T est — Multiport l The T est configuration option determines the duration of a test. T able 4-5 shows the T est configuration option as it appea.
COMSPHERE 392x Plus Modems 4-28 November 1996 3920-A2-GN31-30 Misc — Multiport l The Miscellaneous configuration options determine specifics for various functions, including network management parameters and remote modem access.
DCP Configuration 4-29 3920-A2-GN31-30 November 1996 T able 4-6 (2 of 3) Miscellaneous Configuration Options — Multiport Mode l Dir#1_Callback: Disable Nxt Disable Enable Directory Location 1 Callback. This configuration option controls whether or not the modem’ s single number callback function is used.
COMSPHERE 392x Plus Modems 4-30 November 1996 3920-A2-GN31-30 T able 4-6 (3 of 3) Miscellaneous Configuration Options — Multiport Mode l Diag Connection: Modem(DC) Nxt Modem(DC) NMS(CC) Disable This configuration option does not appear when the LeaseLine Rate is configured for TMp and NetworkPosition is configured for T ributary .
DCP Configuration 4-31 3920-A2-GN31-30 November 1996 Singleport Mode A In Singleport mode, the modem’ s configuration options are arranged into nine groups based on functionality: • DTE Interface (T able 4-7) • DTE Dialer (T able 4-8) • Line Dialer (T able 4-9) • Dial Line (T able 4-10) • Leased Line (T able 4-1 1) • V .
COMSPHERE 392x Plus Modems 4-32 November 1996 3920-A2-GN31-30 DTE Interface Async/Sync Mode Async DTE Rate Asyn #Data Bits Asyn Parity Bit Asyn #Stop Bits DTR Action DSR Control RTS Action RTS Antistream CTS Control RTS/CTS Delay LSD Control Tx Clock Source Bakup_TXClk_Src XTXC Clamps TXC CT1 1 1_Rate Cntl DTE_Rate=VF Extend Main Ch.
DCP Configuration 4-33 3920-A2-GN31-30 November 1996 DTE Interface — Singleport Mode A The DTE Interface configuration options contain EIA-232-D (CCITT V .24) and asynchronous character format information essential for maintaining a connection and for transmitting data between the DTE and the modem.
COMSPHERE 392x Plus Modems 4-34 November 1996 3920-A2-GN31-30 T able 4-7 (2 of 8) DTE Interface Configuration Options — Singleport Mode A Asyn #Data Bits: 8 Nxt 8 7 9(DirectMde) 6(DirectMde) This configuration option only appears when Async/Sync Mode is configured for Async.
DCP Configuration 4-35 3920-A2-GN31-30 November 1996 T able 4-7 (3 of 8) DTE Interface Configuration Options — Singleport Mode A DTR Action: Ignore Nxt Ignore Stndrd_RS232 CntrlsOnHook CntrlsTxMute Data T erminal Ready Action. DTR is a signal from the DTE to the modem indicating that the DTE is connected and ready for operation.
COMSPHERE 392x Plus Modems 4-36 November 1996 3920-A2-GN31-30 T able 4-7 (4 of 8) DTE Interface Configuration Options — Singleport Mode A DSR Control: Stndrd_RS232 (Cont.) The A T command for Forced On is &S0. The A T command for Standard RS232 is &S1.
DCP Configuration 4-37 3920-A2-GN31-30 November 1996 T able 4-7 (5 of 8) DTE Interface Configuration Options — Singleport Mode A CTS Control: Stndrd_RS232 Nxt Stndrd_RS232 Forced_On WinkWhenDisc Follows_DTR Follows_RTS Clear-to-Send Control. CTS is a signal from the modem to the DTE indicating that it can accept data from the DTE.
COMSPHERE 392x Plus Modems 4-38 November 1996 3920-A2-GN31-30 T able 4-7 (6 of 8) DTE Interface Configuration Options — Singleport Mode A LSD Control: Stndrd_RS232 Nxt Stndrd_RS232 Forced_On WinkWhenDisc Follows_DTR Sim_Cntl_Car =DTR/DiscOFF Line Signal Detect Control.
DCP Configuration 4-39 3920-A2-GN31-30 November 1996 T able 4-7 (7 of 8) DTE Interface Configuration Options — Singleport Mode A Bakup_TXClk_Src: Internal Nxt Internal External RXC_Loop This configuration option only appears in customized installations in which the Dual_Leased_Ln is configured for Enable and Async/Sync Mode is Sync.
COMSPHERE 392x Plus Modems 4-40 November 1996 3920-A2-GN31-30 T able 4-7 (8 of 8) DTE Interface Configuration Options — Singleport Mode A Extend Main Ch.: Disable Nxt Disable Enable Primary data can only be extended one link. Extend Main Channel. This configuration option supports extended diagnostics.
DCP Configuration 4-41 3920-A2-GN31-30 November 1996 DTE Dialer — Singleport Mode A The DTE Dialer configuration options establish the DTE-to-modem protocol for call establishment and control.
COMSPHERE 392x Plus Modems 4-42 November 1996 3920-A2-GN31-30 T able 4-8 (2 of 5) DTE Dialer Configuration Options — Singleport Mode A A T Escape Char: 043 ASCI Nxt 043 ASCI This configuration option only appears when DTE Dialer T ype is configured for A T .
DCP Configuration 4-43 3920-A2-GN31-30 November 1996 T able 4-8 (3 of 5) DTE Dialer Configuration Options — Singleport Mode A Linefeed Char: 010 ASCI Nxt 010 ASCI This configuration option only appears when DTE Dialer T ype is configured for A T .
COMSPHERE 392x Plus Modems 4-44 November 1996 3920-A2-GN31-30 T able 4-8 (4 of 5) DTE Dialer Configuration Options — Singleport Mode A ResultCode Form: Words Nxt Words Numbers (1) Numbers (2) This configuration option only appears when DTE Dialer T ype is configured for A T .
DCP Configuration 4-45 3920-A2-GN31-30 November 1996 T able 4-8 (5 of 5) DTE Dialer Configuration Options — Singleport Mode A V25bis IdleFill: Mark Nxt Mark Flag This configuration option only appears when DTE Dialer is configured for V .25bis HDLC.
COMSPHERE 392x Plus Modems 4-46 November 1996 3920-A2-GN31-30 Line Dialer — Singleport Mode A The Line Dialer configuration options establish parameters used by the modem to answer or originate calls.
DCP Configuration 4-47 3920-A2-GN31-30 November 1996 T able 4-9 (2 of 4) Line Dialer Configuration Options — Singleport Mode A BusyT one Detect: Enable Nxt Enable Disable Busy T one Detect. Sets the modem to monitor for Busy T one (Enable) or ignore Busy T one (Disable).
COMSPHERE 392x Plus Modems 4-48 November 1996 3920-A2-GN31-30 T able 4-9 (3 of 4) Line Dialer Configuration Options — Singleport Mode A Long Space Disc: Enable Nxt Enable Disable Long Space Disconnect. Determines the modem’ s response to a continuous spacing condition sent from the remote modem before it goes on-hook.
DCP Configuration 4-49 3920-A2-GN31-30 November 1996 T able 4-9 (4 of 4) Line Dialer Configuration Options — Singleport Mode A Auto Make Busy: Disable Nxt Disable Enable This option is only valid on Model 3921 Plu s.
COMSPHERE 392x Plus Modems 4-50 November 1996 3920-A2-GN31-30 Dial Line — Singleport Mode A The Dial Line configuration options are used to configure the modem for operation over dial lines.
DCP Configuration 4-51 3920-A2-GN31-30 November 1996 T able 4-10 (2 of 3) Dial Line Configuration Options — Singleport Mode A Automode: Enable Nxt Enable Disable System 85 This configuration option only appears when Dial Line Rate is configured for V .
COMSPHERE 392x Plus Modems 4-52 November 1996 3920-A2-GN31-30 T able 4-10 (3 of 3) Dial Line Configuration Options — Singleport Mode A V22b Guard T one: Disable Nxt Disable 550Hz 1800Hz This configuration option only appears when Dial Line Rate is configured for V .
DCP Configuration 4-53 3920-A2-GN31-30 November 1996 Leased Line — Singleport Mode A The Leased Line configuration options only appear when the Sync Leased factory preset template is selected. They are used to configure the modem for operation over leased lines.
COMSPHERE 392x Plus Modems 4-54 November 1996 3920-A2-GN31-30 T able 4-1 1 (2 of 5) Leased Line Configuration Options— Singleport Mode A LeasedLine Rate: 28800(V34) (Cont.) 4800(V27bis), 2400(V27bis) – This modulation scheme is available on 2-wire (half-duplex) and 4-wire leased lines.
DCP Configuration 4-55 3920-A2-GN31-30 November 1996 T able 4-1 1 (3 of 5) Leased Line Configuration Options— Singleport Mode A Leased Tx Level: 0 Nxt 0 –1 –2 –3 – 4 – 5 – 6 –7 – 8 – 9 –10 –1 1 –12 –13 –14 –15 Leased T ransmit Level.
COMSPHERE 392x Plus Modems 4-56 November 1996 3920-A2-GN31-30 T able 4-1 1 (4 of 5) Leased Line Configuration Options— Singleport Mode A SpecialStandby: Disable Nxt Disable Enable This configuration.
DCP Configuration 4-57 3920-A2-GN31-30 November 1996 T able 4-1 1 (5 of 5) Leased Line Configuration Options— Singleport Mode A V29 Link Config: PointT oPoint Nxt PointT oPoint Multipoint This configuration option only appears when Leased-Line Rate is configured for V29.
COMSPHERE 392x Plus Modems 4-58 November 1996 3920-A2-GN31-30 V .42/MNP/Buffer — Singleport Mode A V .42/MNP/Buffer configuration options determine the type of error correction and flow control used by the modems and attached DTEs. Some choices within this group may not appear depending upon how previous configuration options have been selected.
DCP Configuration 4-59 3920-A2-GN31-30 November 1996 T able 4-12 (2 of 6) V .42/MNP/Buffer Configuration Options — Singleport Mode A Err Contrl Mode: V .42/MNPorBfr (Cont.) The A T command for Buffer Mode is N0. The A T command for Direct Mode is N1.
COMSPHERE 392x Plus Modems 4-60 November 1996 3920-A2-GN31-30 T able 4-12 (3 of 6) V .42/MNP/Buffer Configuration Options — Singleport Mode A EC Fallbck Char: 013 ASCI Nxt 013 ASCI This configuration option only appears when Async/Sync Mode is configured for Async, and EC Negotiate Buffer is not configured for Disable.
DCP Configuration 4-61 3920-A2-GN31-30 November 1996 T able 4-12 (4 of 6) V .42/MNP/Buffer Configuration Options — Singleport Mode A XON/XOFF Psthru: Disable Nxt Disable Enable This configuration option only appears when Async/Sync Mode is configured for Async, and Flow Control of Modem is configured for XON/XOFF Psthru.
COMSPHERE 392x Plus Modems 4-62 November 1996 3920-A2-GN31-30 T able 4-12 (5 of 6) V .42/MNP/Buffer Configuration Options — Singleport Mode A Send Break Cntl: Data_First End Data_First Break_First This configuration option only appears when Async/Sync Mode is configured for Async, and Error Control Mode is not configured for DirectMode.
DCP Configuration 4-63 3920-A2-GN31-30 November 1996 T able 4-12 (6 of 6) V .42/MNP/Buffer Configuration Options — Singleport Mode A CellularEnhance: Disable Nxt Disable Enable This configuration op.
COMSPHERE 392x Plus Modems 4-64 November 1996 3920-A2-GN31-30 T est — Singleport Mode A The T est configuration options determine specifics, such as the duration of a test, for the various diagnostic tests available to the modem.
DCP Configuration 4-65 3920-A2-GN31-30 November 1996 T able 4-13 (2 of 2) T est Configuration Options — Singleport Mode A V54 Address: Disable Nxt Disable (Address V alues) V .54 Address. Determines which remote 392x Plus modem is placed into a remote loopback test.
COMSPHERE 392x Plus Modems 4-66 November 1996 3920-A2-GN31-30 Misc — Singleport Mode A The Miscellaneous configuration options determine specifics for various functions, including network management parameters and remote modem access.
DCP Configuration 4-67 3920-A2-GN31-30 November 1996 T able 4-14 (2 of 3) Miscellaneous Configuration Options — Singleport Mode A Access frm Remt: Enable Nxt Enable Disable Access from Remote. Determines if your modem’ s DCP can be accessed by a remote modem via the VF line.
COMSPHERE 392x Plus Modems 4-68 November 1996 3920-A2-GN31-30 T able 4-14 (3 of 3) Miscellaneous Configuration Options — Singleport Mode A NetworkPosition: T ributary End T ributary Control Network Position Identification. Each modem must be identified either as a control modem or a tributary modem.
5-1 3920-A2-GN31-30 November 1996 A T Command Set and S-Registers Overview 5-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating Modes 5-1 . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 392x Plus Modems 5-2 November 1996 3920-A2-GN31-30 Escape Sequence and Escape Guard Time The escape sequence is only issued when the modem is online and in Data mode. The 392x Plus modems use three consecutive plus ( + ) characters as the escape sequence.
A T Command Set and S-Registers 5-3 3920-A2-GN31-30 November 1996 Result Codes T able 5-1 lists all valid result codes for the 392x Plus modems. T able 5-1 (1 of 2) Result Codes Numbers (1) Numbers (2.
COMSPHERE 392x Plus Modems 5-4 November 1996 3920-A2-GN31-30 T able 5-1 (2 of 2) Result Codes Numbers (1) Description Word Numbers (2) 22 12 CONNECT 9600/ EC**** Connection at 9600 bps with error cont.
A T Command Set and S-Registers 5-5 3920-A2-GN31-30 November 1996 A T Command List A T commands are issued from an asynchronous DTE, such as a PC, and control the modem’ s operation and software configuration. A T commands are only applicable when the DTE Dialer T ype configuration option is set for A T .
COMSPHERE 392x Plus Modems 5-6 November 1996 3920-A2-GN31-30 T able 5-2 (1 of 9) 392x Plus A T Commands AT Command Description DCP LCD Command Sequence A/ Repeat Last Command. Reexecutes last command string. (Not to be preceded with A T or followed by pressing the Return key .
A T Command Set and S-Registers 5-7 3920-A2-GN31-30 November 1996 T able 5-2 (2 of 9) 392x Plus A T Commands AT Command DCP LCD Command Sequence Description DS= n Dial Stored Number . Dials the number stored in Location n (1–24). (T o store a telephone number , refer to the & Zn=x command.
COMSPHERE 392x Plus Modems 5-8 November 1996 3920-A2-GN31-30 T able 5-2 (3 of 9) 392x Plus A T Commands AT Command DCP LCD Command Sequence Description X n Extended Result Code, Dial T one Detect, and Busy T one Detect Configuration Options.
A T Command Set and S-Registers 5-9 3920-A2-GN31-30 November 1996 T able 5-2 (4 of 9) 392x Plus A T Commands AT Command DCP LCD Command Sequence Description &C n LSD Control. &C0 Forced On. LSD ON at all times. &C1 Standard RS232. LSD is ON when the remote modem’s carrier signal is detected.
COMSPHERE 392x Plus Modems 5-10 November 1996 3920-A2-GN31-30 T able 5-2 (5 of 9) 392x Plus A T Commands AT Command DCP LCD Command Sequence Description &G n V .22bis Guard T one. &G0 Disable. &G1 550 Hz. &G2 1800 Hz. ConfigureEdit Dial Line NOTE: The V .
A T Command Set and S-Registers 5-1 1 3920-A2-GN31-30 November 1996 T able 5-2 (6 of 9) 392x Plus A T Commands AT Command DCP LCD Command Sequence Description &M n and &Q n Async/Sync Mode and DTE Dialer T ype. &M0, &Q0 Modem operates in Asynchronous mode using A T Command protocol.
COMSPHERE 392x Plus Modems 5-12 November 1996 3920-A2-GN31-30 T able 5-2 (7 of 9) 392x Plus A T Commands AT Command DCP LCD Command Sequence Description &T n T ests. &T0 Abort. Stops any test in progress. &T1 Local Analog Loop. &T2 Pattern.
A T Command Set and S-Registers 5-13 3920-A2-GN31-30 November 1996 T able 5-2 (8 of 9) 392x Plus A T Commands AT Command DCP LCD Command Sequence Description &Z n=x Store T elephone Numbers. Modem saves the telephone numbers and dial command modifiers (if any) entered for x (up to 40 characters in length) in Directory Location n (1–24).
COMSPHERE 392x Plus Modems 5-14 November 1996 3920-A2-GN31-30 T able 5-2 (9 of 9) 392x Plus A T Commands AT Command DCP LCD Command Sequence Description N n Error Control Mode. N0 Buffer Mode. N1 Direct Mode. N2 MNP or Disconnect. N3 MNP or Buffer . N4 V .
A T Command Set and S-Registers 5-15 3920-A2-GN31-30 November 1996 S-Register List S-Registers af fect the operating parameters of the 392x Plus modems. S-Registers are only applicable when the DTE Dialer T ype configuration option is set for A T . (Refer to the &M n and &Q n commands.
COMSPHERE 392x Plus Modems 5-16 November 1996 3920-A2-GN31-30 T able 5-3 (1 of 12) 392x Plus S-Registers S-Register Description DCP LCD Command Sequence S0 Auto-Answer Ring Number 1 . Register determines number of rings the modem will count before automatically answering a call.
A T Command Set and S-Registers 5-17 3920-A2-GN31-30 November 1996 T able 5-3 (2 of 12) 392x Plus S-Registers S-Register DCP LCD Command Sequence Description S12 Escape Guard Time. Register sets the value (in 20-millisecond increments) for the required pause before and after the escape sequence is issued.
COMSPHERE 392x Plus Modems 5-18 November 1996 3920-A2-GN31-30 T able 5-3 (3 of 12) 392x Plus S-Registers S-Register DCP LCD Command Sequence Description S41 Dial-Line Rate. Register determines the modem’ s data rate and modulation scheme for operation on dial lines.
A T Command Set and S-Registers 5-19 3920-A2-GN31-30 November 1996 T able 5-3 (4 of 12) 392x Plus S-Registers S-Register DCP LCD Command Sequence Description S44 Leased-Line Rate. Register determines the modem’ s data rate and modulation scheme for operation on either 2-wire or 4-wire leased lines in either Answer or Originate mode.
COMSPHERE 392x Plus Modems 5-20 November 1996 3920-A2-GN31-30 T able 5-3 (5 of 12) 392x Plus S-Registers S-Register DCP LCD Command Sequence Description S46 Auto Dial Backup. Register determines if the modem performs an automatic dial backup if the leased lines fail.
A T Command Set and S-Registers 5-21 3920-A2-GN31-30 November 1996 T able 5-3 (6 of 12) 392x Plus S-Registers S-Register DCP LCD Command Sequence Description S52 DTE LL (CT141). Register determines if the modem performs a local analog loopback if it receives a CT141 signal from the DTE.
COMSPHERE 392x Plus Modems 5-22 November 1996 3920-A2-GN31-30 T able 5-3 (7 of 12) 392x Plus S-Registers S-Register DCP LCD Command Sequence Description S61 CT1 1 1 Rate Control. Register determines if CT1 1 1 Rate is disabled, set for Fallback 1 or Fallback 2.
A T Command Set and S-Registers 5-23 3920-A2-GN31-30 November 1996 T able 5-3 (8 of 12) 392x Plus S-Registers S-Register DCP LCD Command Sequence Description S66 NMS Call Messages.
COMSPHERE 392x Plus Modems 5-24 November 1996 3920-A2-GN31-30 T able 5-3 (9 of 12) 392x Plus S-Registers S-Register DCP LCD Command Sequence Description S74 Network Position Identification. Register identifies each modem as either a control or tributary modem.
A T Command Set and S-Registers 5-25 3920-A2-GN31-30 November 1996 T able 5-3 (10 of 12) 392x Plus S-Registers S-Register DCP LCD Command Sequence Description S85 Fast Disconnect. Register allows the modem to disconnect immediately after receiving a disconnect command from a local DTE or its own diagnostic control panel.
COMSPHERE 392x Plus Modems 5-26 November 1996 3920-A2-GN31-30 T able 5-3 (1 1 of 12) 392x Plus S-Registers S-Register DCP LCD Command Sequence Description S91 Cellular Enhancement. Register allows the modem to use non-standard techniques to enhance V .
A T Command Set and S-Registers 5-27 3920-A2-GN31-30 November 1996 T able 5-3 (12 of 12) 392x Plus S-Registers S-Register DCP LCD Command Sequence Description S96 Trellis Multipoint (TMp) Tx Preemphasis. Provides amplification for frequencies above the carrier frequency to compensate for high frequency line attenuation.
6-1 3920-A2-GN31-30 November 1996 Dial Access Security Chapter 6, Dial Access Security , is not available for viewing online because it contains security-sensitive information. Dial Access Security information is available in the COMSPHERE 392x Plus Modems Models 3920 Plus and 3921 Plus Installation and Operation Manual, Document No.
A-1 3920-A2-GN31-30 November 1996 Menu T ree Overview A-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 392x Plus Modems A-2 November 1996 3920-A2-GN31-30 Displays current status of modem along with data rate and error control mode. “Status” Status Configure PList Ld EditArea frm: Display .
Menu T ree A-3 3920-A2-GN31-30 November 1996 Y z z Y Y Y Y Y Y Y Y Y Y Y z Y Control SubHS Call_Setup Tlk/Data Remote Security T est (Dial Backup only) Dial Answer Change_Directory Disconnect Dial_Sta.
B-1 3920-A2-GN31-30 November 1996 T roubleshooting Overview B-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Overview This appendix points out basic problems that can occur when operating a 392x Plus modem.
COMSPHERE 392x Plus Modems B-2 November 1996 3920-A2-GN31-30 T able B-2 Leased-Line Operation Symptom Action The modems do not train-up on leased lines. V erify that the correct cabling is used for your application. Refer to Chapter 2, Modem Installation .
T roubleshooting B-3 3920-A2-GN31-30 November 1996 T able B-4 Modem — DTE Connection Symptom Action The modem does not accept or echo back A T commands. V erify that the cable between the Async port of the DTE and the modem is a standard RS-232 cable.
COMSPHERE 392x Plus Modems B-4 November 1996 3920-A2-GN31-30 T able B-5 (1 of 2) Modem — VF Connection Symptom Action The modem does not receive a dial tone. Attach a telephone directly to the telephone line to verify that a dial tone exists. Make sure the VF line is connected to the modem’ s rear jack labeled DIAL.
T roubleshooting B-5 3920-A2-GN31-30 November 1996 T able B-5 (2 of 2) Modem — VF Connection Symptom Action Intermittent disconnects, high error rates, or excessive retransmissions occur . Perform an End-to-End test. Refer to Pattern located in the T est Branch section of Chapter 3.
C-1 3920-A2-GN31-30 November 1996 Pin Assignments Overview C-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EIA-232-D Pin Assignments C-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 392x Plus Modems C-2 November 1996 3920-A2-GN31-30 EIA-232-D Pin Assignments T able C-1 lists the EIA-232-D pin assignments for the modem. T able C-1 EIA-232-D Pin Assignments Pin Name EIA C.
Pin Assignments C-3 3920-A2-GN31-30 November 1996 VF Connector Pin Assignments T able C-2 lists the connector pin assignments for Model 3920 Plus modular jacks as well as the pin assignments for the TELCO jacks.
COMSPHERE 392x Plus Modems C-4 November 1996 3920-A2-GN31-30 Auxiliary Cables Not Supplied T o add an external telephone to your modem, use an external “Y” cable to connect the phone line to both the modem and the telephone (Figure C-2). Figure C-2.
Pin Assignments C-5 3920-A2-GN31-30 November 1996 For 2-wire leased-line connections to a JM8 network interface, use an 8-position to 6-position crossover cable (Figure C-3) according to the following.
COMSPHERE 392x Plus Modems C-6 November 1996 3920-A2-GN31-30 To connect a Model 3920 Plus port to another modem’ s EIA-232-D interface, use a 25-pin crossover cable (Figure C-4).
D-1 3920-A2-GN31-30 November 1996 CCITT V .25bis Dialing Command and Responses Overview D-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Call Request Commands D-2 . . . . . . . . . . . . . . .
COMSPHERE 392x Plus Modems D-2 November 1996 3920-A2-GN31-30 Call Request Commands Call Request commands are issued from the DTE to the modem and are responsible for initiating dial calls. Call Request commands include Call Request with Number Provided (CRN) and Call Request with Stored Memory Address Provided (CRS).
CCITT V .25bis Dialing D-3 3920-A2-GN31-30 November 1996 ET is similar to the Call Failure Messages Busy Signal and T runk Busy and the result code BUSY . NS is similar to the Common Operational Message Invalid Number and the result code ERROR. CB is similar to the Call Failure Messages Dial Line in Use and No Dial-T est and the result code ERROR.
COMSPHERE 392x Plus Modems D-4 November 1996 3920-A2-GN31-30 Connect Incoming Call (CIC) The CIC command forces the modem to cancel any DIC commands and answer an incoming call. This command is only valid when the DTE issues a DIC command. CIC must be issued within 10 seconds after sending a DIC.
CCITT V .25bis Dialing D-5 3920-A2-GN31-30 November 1996 Request List of Stored Numbers (RLN) The Request List of Stored Numbers (RLN) command displays telephone numbers stored in the modem’ s directory location. If the RLN command is entered without specifying a directory location, then all directory locations and telephone numbers appear .
COMSPHERE 392x Plus Modems D-6 November 1996 3920-A2-GN31-30 Command Response A Command Response indicates that the command entered was a valid or invalid entry . Command Response includes V alid (V AL) and Invalid (INV). V alid (V AL) The V AL response indicates that the modem has accepted the V .
CCITT V .25bis Dialing D-7 3920-A2-GN31-30 November 1996 T able D-1 (2 of 2) V .25bis Commands V .25bis Command A T Command/ S-Register Equivalent Description List Request RLD Request to List Delayed .
E-1 3920-A2-GN31-30 November 1996 ASCII Character T able Overview E-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 392x Plus Modems E-2 November 1996 3920-A2-GN31-30 T able E-1 (2 of 4) ASCII Characters Hexadecimal ASCII V alue Key Control Character Decimal ASCII V alue 17 023 ETB CTRL-W 18 024 CAN CTRL-.
ASCII Character T able E-3 3920-A2-GN31-30 November 1996 T able E-1 (3 of 4) ASCII Characters Hexadecimal ASCII V alue Key Control Character Decimal ASCII V alue 3E 062 > 3F 063 ? 40 064 @ 41 065 A.
COMSPHERE 392x Plus Modems E-4 November 1996 3920-A2-GN31-30 T able E-1 (4 of 4) ASCII Characters Hexadecimal ASCII V alue Key Control Character Decimal ASCII V alue 65 101 e 66 102 f 67 103 g 68 104 .
F-1 3920-A2-GN31-30 November 1996 Default Configuration Options Overview F-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 392x Plus Modems F-2 November 1996 3920-A2-GN31-30 T able F-1 (1 of 10) Factory Default Configuration Options Configuration Option Sync Leased Default Settings Async Leased Default Settings .
Default Configuration Options F-3 3920-A2-GN31-30 November 1996 T able F-1 (2 of 10) Factory Default Configuration Options Configuration Option Sync Dial Default Settings UNIX Dial Default Settings Async Dial Default Settings TMp Default Settings Async Leased Default Settings Sync Leased Default Settings Port Rate Sub-group (Cont’d) Rate at 14.
COMSPHERE 392x Plus Modems F-4 November 1996 3920-A2-GN31-30 T able F-1 (3 of 10) Factory Default Configuration Options Configuration Option Sync Dial Default Settings UNIX Dial Default Settings Async.
Default Configuration Options F-5 3920-A2-GN31-30 November 1996 T able F-1 (4 of 10) Factory Default Configuration Options Configuration Option Sync Dial Default Settings UNIX Dial Default Settings As.
COMSPHERE 392x Plus Modems F-6 November 1996 3920-A2-GN31-30 T able F-1 (5 of 10) Factory Default Configuration Options Configuration Option Sync Dial Default Settings UNIX Dial Default Settings Async.
Default Configuration Options F-7 3920-A2-GN31-30 November 1996 T able F-1 (6 of 10) Factory Default Configuration Options Configuration Option Sync Dial Default Settings UNIX Dial Default Settings Async Dial Default Settings TMp Default Settings Async Leased Default Settings Sync Leased Default Settings Dial Line Dial Modulation V .
COMSPHERE 392x Plus Modems F-8 November 1996 3920-A2-GN31-30 T able F-1 (7 of 10) Factory Default Configuration Options Configuration Option Sync Dial Default Settings UNIX Dial Default Settings Async Dial Default Settings TMp Default Settings Async Leased Default Settings Sync Leased Default Settings Lease Line (Cont’d) V .
Default Configuration Options F-9 3920-A2-GN31-30 November 1996 T able F-1 (8 of 10) Factory Default Configuration Options Configuration Option Sync Dial Default Settings UNIX Dial Default Settings Async Dial Default Settings TMp Default Settings Async Leased Default Settings Sync Leased Default Settings V .
COMSPHERE 392x Plus Modems F-10 November 1996 3920-A2-GN31-30 T able F-1 (9 of 10) Factory Default Configuration Options Configuration Option Sync Dial Default Settings UNIX Dial Default Settings Asyn.
Default Configuration Options F-1 1 3920-A2-GN31-30 November 1996 T able F-1 (10 of 10) Factory Default Configuration Options Configuration Option Sync Dial Default Settings UNIX Dial Default Settings.
G-1 3920-A2-GN31-30 November 1996 Sample Configurations Overview G-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Point-to-Point G-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMSPHERE 392x Plus Modems G-2 November 1996 3920-A2-GN31-30 Point-to-Point Figure G-1 shows a sample configuration for point-to-point applications. Cable 1 Cable 2 Cable 2 Leased 28800(V34) 28800(V34.
Sample Configurations G-3 3920-A2-GN31-30 November 1996 Sample Port Rate T able Port Rate Port 1 Port 2 Port 3 Port 4 28.8K 9600 9600 4800 4800 24.0K 9600 Disable 4800 4800 19.2K 9600 Disable 4800 4800 16.8K 9600 Disable Disable 4800 14.4K 9600 Disable Disable 4800 12.
COMSPHERE 392x Plus Modems G-4 November 1996 3920-A2-GN31-30 Extended Point-to-Point Figure G-2 shows a sample configuration for extended point-to-point applications.
Sample Configurations G-5 3920-A2-GN31-30 November 1996 3910 A Use Sync Leased (Answer) default configuration options with the following exceptions: TX Clock Sour ce Set to External. LeasedLine Rate Set to 4800(V32b). Autorate (Leased Line) Set to Disable.
COMSPHERE 392x Plus Modems G-6 November 1996 3920-A2-GN31-30 Extended Multipoint Figure G-3 shows a sample configuration for extended multipoint applications.
Sample Configurations G-7 3920-A2-GN31-30 November 1996 Configuration Options 3920 Plus A Use Sync Leased (Answer) default configuration options with the following exception: Rate Refer to Sample Port Rate T able in this section.
COMSPHERE 392x Plus Modems G-8 November 1996 3920-A2-GN31-30 Cables Cable 1 Use a standard, customer -supplied, EIA-232-D/V .24 cable with a DB-25-P (plug) connector at one end to attach to the modem. Attach this to the connector labeled DTE1 , 2 , 3 , or 4 .
Sample Configurations G-9 3920-A2-GN31-30 November 1996 Configuration Options 3920 Plus A Use Sync Leased (Answer) default configuration options with the following exception: Auto Dial Back Set to Enable. Rate Refer to Sample Port Rate T able in this section.
COMSPHERE 392x Plus Modems G-10 November 1996 3920-A2-GN31-30 Point-to-Point with Network Management Figure G-5 shows a sample configuration for point-to-point applications with network management.
Sample Configurations G-1 1 3920-A2-GN31-30 November 1996 Sample Port Rate T able Port Rate Port 1 Port 2 Port 3 Port 4 28.8K 9600 9600 4800 4800 24.0K 9600 Disable 4800 4800 19.2K 9600 Disable 4800 4800 16.8K 9600 Disable Disable 4800 14.4K 9600 Disable Disable 4800 12.
COMSPHERE 392x Plus Modems G-12 November 1996 3920-A2-GN31-30 Carrier with Network Management Figure G-6 shows a sample configuration for COMSPHERE 3000 Series Carrier applications with network management.
Sample Configurations G-13 3920-A2-GN31-30 November 1996 Configuration Options 3921 Plus Use Sync Leased (Answer) default configuration options with the following exception: Rate Refer to the Sample Port Rate T able in this section. Diag Connection Set to NMS(CC).
COMSPHERE 392x Plus Modems G-14 November 1996 3920-A2-GN31-30 Extended Diagnostics Figure G-7 shows a sample configuration for extended diagnostics. Figure G-7.
Sample Configurations G-15 3920-A2-GN31-30 November 1996 3920 Plus C Use Sync Leased (Answer) default configuration options with the following exceptions: Tx Clock Sour ce Set to External. Extended Channel Set Port 1 to Enable. Upstream Port # Set to Port 1.
COMSPHERE 392x Plus Modems G-16 November 1996 3920-A2-GN31-30 Digital Bridging Figure G-8 shows a sample for Digital Bridging. Figure G-8. Sample Configuration Digital Bridge 3920 Plus A Use TMp Control T emplate default configuration options with the following exception: MUX Mode Set to DTE Bridge.
Sample Configurations G-17 3920-A2-GN31-30 November 1996 3920 Plus E, G Use TMp Tributary template default configuration options with the following exceptions: Port2 MSD Set to Enable. R TS Action Set to Sim_Cntl_Car . Auto Dial Back Set to Enable. Auto Dial Standby Set to Adv 15min.
COMSPHERE 392x Plus Modems G-18 November 1996 3920-A2-GN31-30 Point-to-Point MSD Figure G-9 shows a sample configuration for point-to-point MSD. Figure G-9.
Sample Configurations G-19 3920-A2-GN31-30 November 1996 Sample Port Rate T able: Point-to-Point MSD 3920Plus A Port Rate Port 1 Port 2 Port 3 Port 4 28.8K 19200 Disable Disable 9600 24.0K 14400 Disable Disable 9600 19.2K 9600 Disable Disable 9600 16.
COMSPHERE 392x Plus Modems G-20 November 1996 3920-A2-GN31-30 Multipoint MSD Figure G-10 shows a sample configuration for multipoint MSD. Figure G-10. Sample Configuration — Multipoint MSD 3920 Plus A Use TMp Control T emplate default configuration options with the following exception: NetworkPosition Set to Control.
Sample Configurations G-21 3920-A2-GN31-30 November 1996 Cables Cable 1 Use a standard, customer -supplied, EIA-232-D/V .24 cable with a DB-25-P (plug) connector at one end to attach to the modem. Attach this to the connector labeled DTE1 , 2 , 3 , or 4 .
H-1 3920-A2-GN31-30 November 1996 Equipment List Equipment Feature/ Part Number Model 3920 Plus 3920-A1-XXX Model 3921 Plus 3921-B1-XXX 6-position, 4-wire modular cord, 7-foot length 125-0067-0031 8-position, 8-wire modular cord, 14-foot length 125-0053-1431 Universal Power Supply 327-0074-XXXX 3600 Hubbing Device 3600-F3-300 EIA-323-D/V .
Glossary-1 3920-A2-GN31-30 November 1996 Glossary Active (Operating) A configuration area containing configuration options currently in use by the modem. Any time a power cycle occurs or a reset is performed or a save is issued using the DCP , this area is updated with the contents of Active (Saved).
COMSPHERE 392x Plus Modems Glossary-2 November 1996 3920-A2-GN31-30 automatic dial standby When operating in Dial Backup mode, this function forces the modem to periodically check the quality of the leased line.
Glossary Glossary-3 3920-A2-GN31-30 November 1996 circuit pack lock A screw lock tab installed over a circuit card’ s latch release tab to prevent the unit from being removed without a tool. It is used on SDUs, modems, and filler panels. command mode One of two modem operating modes.
COMSPHERE 392x Plus Modems Glossary-4 November 1996 3920-A2-GN31-30 dBm A decibel referenced to one milliwatt. This unit measures relative signal power . DCE The equipment (Data Communications Equipment or Data Circuit T erminating Equipment) that provides the functions required to establish, maintain, and end a connection.
Glossary Glossary-5 3920-A2-GN31-30 November 1996 EIA Electronic Industries Association. This or ganization provides standards for the data communications industry . EIA-232-D An Electronic Industries Association’ s standard defining the 25-position interface between data terminal equipment and data communications equipment.
COMSPHERE 392x Plus Modems Glossary-6 November 1996 3920-A2-GN31-30 idle A state in which the modem’ s operating parameters can be modified or commands can be issued to the modem using either A T commands or the DCP . JM8 A jack used for leased-line networks.
Glossary Glossary-7 3920-A2-GN31-30 November 1996 network A communications circuit. network management address The customer -assigned diagnostic address of a modem. NIM Network Interface Module. The interface provided, up to two per carrier , for the public switched telephone network (PSTN).
COMSPHERE 392x Plus Modems Glossary-8 November 1996 3920-A2-GN31-30 register A part of the modem’ s memory that contains values that determine the modem’ s operating characteristics. Remote A branch of the T op-Level menu that permits access to the DCP of another modem.
Glossary Glossary-9 3920-A2-GN31-30 November 1996 TDM T ime Division Multiplexer . A device that enables the simultaneous transmission of multiple independent data streams into a single high-speed data stream by simultaneously sampling the independent data streams and combining these samples to form the high-speed stream.
COMSPHERE 392x Plus Modems Glossary-10 November 1996 3920-A2-GN31-30 VF V oice Frequency . The part of the audio frequency range used to transmit voice sound (usually 300 Hz to 3400 Hz). This band is used by the modem for its modulated signal. XOFF A character that tells the DTE or modem to stop transmitting data.
Index-1 3920-A2-GN31-30 November 1996 Index A Abort (test), 3-55 ac power requirements, 1-13 Active (Operating) configurations, 4-1 Active (Saved) configurations, 4-1 address, network management, 3-31.
COMSPHERE 392x Plus Modems Index-2 November 1996 3920-A2-GN31-30 D data access arrangement, 1-2 data compression, 4-59 data rates. See rates DA T AKIT , 4-16, 4-38, 4-41 DataStream, 3-37 default configuration options, 2-1 1–2-12, 4-2, F-2–F-7 diagnostic control panel (DCP) configurations.
Index Index-3 3920-A2-GN31-30 November 1996 Load Number (LN), 1-12 loopback local analog, 3-57–3-58 local digital, 3-60–3-61 remote digital, 3-58–3-59 M Make Busy , 3-40–3-41 manual dial.
COMSPHERE 392x Plus Modems Index-4 November 1996 3920-A2-GN31-30 reset control, 3-37 result codes enable/disable, 4-43, 5-7 extended, 4-43, 5-8 list, 5-3–5-4 numeric or word, 4-44, 5-7 ringer equiva.
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