Cisco Systemsメーカー7920の使用説明書/サービス説明書
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iii Site Sur vey Guide fo r Deploying C isco 7920 IP Pho nes OL-6315-01 CONTENTS Preface v CHAPTER 1 Overview 1- 1 Recommenda tion s for Succe ssful VoI P Surveys 1-1 Gettin g star ted 1-2 Minimum Req.
Cont ent s iv Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01.
v Site Sur vey Guide fo r Deploying C isco 7920 IP Pho nes OL-6315-01 Preface This doc ument provides inst ructio ns and guidelin es for condu cting a site su rvey for wir eless LA Ns using V oice over IP (V oIP) o n Cis co 79 20 IP Phon es.
vi Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Preface.
C HAPTER 1-1 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 1 Overview This documen t be gins by identif ying the spec ific radi o en vironmenta l v alue s that ar e ne eded fo r a successful voice de ployment.
1-2 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Ch apter 1 Over vi ew Recomme ndations for Success ful VoIP Survey s degr adation.
1-3 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 1 Ov erview Recommen dations f or Succ essful Vo IP Surveys Figur e 1 -1 ACU Site Surv e y Window Noise is def ined as a 2.4-GHz signal that is not in an 802 .11 DSSS format bu t is in the frequency range of the access p oint’s conf igure d ch anne l.
1-4 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Ch apter 1 Over vi ew Recomme ndations for Success ful VoIP Survey s Figur e 1 -2 Signal to Noise Ratio Minimum Require ments for WIP T Cells Ta b l e 1 - 1 lists the minimum v alues for v oice and data cells.
1-5 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 1 Ov erview Recommen dations f or Succ essful Vo IP Surveys difference in transm itter power an d receiver sensitivity that ma tters beca use the gai n of an an tenna i s recip rocal.
1-6 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Ch apter 1 Over vi ew Recomme ndations for Success ful VoIP Survey s Figure 1-4 also illustrates the recommended o ver lap of 15 to 20 percent for WIPT cells ( larger than the 10 to 15 p ercent for data cells).
1-7 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 1 Ov erview Recommen dations f or Succ essful Vo IP Surveys The char acteristic s of V oIP r equire a met iculous WIPT site sur vey . T o av oid a c all with ji tter , th e delay variation betwe en packets shoul d not exceed 30 ms.
1-8 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Ch apter 1 Over vi ew Recomme ndations for Success ful VoIP Survey s Compariso n of a M anual Surve y and an A utomated S urvey Figure 1-6 sh ows an act ual ho spital survey done using Ai rMag net Surveyor wit h an 8 02.
1-9 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 1 Ov erview Recommen dations f or Succ essful Vo IP Surveys Fi g u re 1-7 Ho s p i ta l F l oo r Su r vey by a S u r vey.
1-10 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Ch apter 1 Over vi ew Recomme ndations for Success ful VoIP Survey s.
C HAPTER 2-1 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 2 Survey Tools AirM agnet offers ma ny tools f or an alyzi ng 80 2.11 perform ance at a site . Fi gure 2-1 sh ows the AirMagn et Survey tool. Cisco reco mmend s AirMagne t for data an d WIPT surveys.
2-2 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 2 Su rvey Too ls Figur e 2-2 AirMagnet P a ck et Decode T ool The 7920 survey tool rep orts the signal stren gth of the sign al from the a ccess poi nt as an RSSI value. Most client c ard utilitie s report signal str ength as dBm or per cent of signal str ength.
2-3 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 2 Survey Tools The d ata in Ta b l e 2 - 1 was c reated fr om live tests. Each tool an d card combi nation data po int was taken at the sam e time from the same dis tance.
2-4 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 2 Su rvey Too ls The Cisc o CB21 ADU repor ts signal st rength in dBm . Figur e 2-4 shows the ADU Adv anced Status windo w .
2-5 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 2 Survey Tools Figur e 2-5 AirMagnet Surve y T ool.
2-6 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 2 Su rvey Too ls The Air Magnet Survey packet de code tool shows signal strengt h in dBm.
2-7 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 2 Survey Tools Figur e 2-7 Air oP eek Windo w AiroPeek has options to show real-t ime graphs of current signal strengt h and current noise le vels both in dBm and pe rcen tages, but it does not have a surve y tool like A CU or AirM agne t.
2-8 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 2 Su rvey Too ls Figur e 2-8 Air oP eek dBm and Signa l P er centag e Real-Time Graph s Snif fer Pro fr om Network A ssociates sho ws th e signal strength in a perce nt v alue.
2-9 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 2 Survey Tools The Cisc o access point displ ays the signa l strength of the packets fr om the client.
2-10 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 2 Su rvey Too ls Figure 2-11 shows that the 7920 hears th ree acce ss points an d the RSSI values of those access points ar e 18, 31, and 48. Figur e 2-1 1 Cisco 79 20 IP Phone Surv ey Scr een Y ou can also use Air Magnet Su rveyor to de termine chann el s eparation.
2-11 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 2 Survey Tools Survey Too ls for Pa cket Jit ter Survey Tools for Packet Jitter T ypicall y , voice pac kets ar e sent every 20 ms.
2-12 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 2 Su rvey Too ls Survey To ols for Packet J itter Figur e 2-1 4 AirMagnet Jit te r T ool in an Ent er pr ise Off ice with High 8 02.
2-13 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 2 Survey Tools Survey Too ls for Pa cket Jit ter Home off ice u tiliz ation is 2 .18 p ercent and t he throughp ut i s 246 kbps for 1 1 Mbp s-onl y calls, wit h a single act iv e WIPT call, but utiliz ation is 15.
2-14 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 2 Su rvey Too ls Survey To ols for Packet J itter.
C HAPTER 3-1 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 3 Surveying for Cell Capacity an d Channel Re-Use This chap ter de scribe s ho w to perfo rm a site sur ve y to de sign a wirele ss LAN for cel l capaci ty and chan nel re -use.
3-2 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapt er 3 Surveying f or Cell Capacit y and Channel Re -Use Survey Des ign for Cell Capac ity Note If the Cisco acces s point is configured to di sable data rates 1, 2, and 5. 5, clients ar e not requi red to transmit on ly at 11 Mbps.
C HAPTER 4-3 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 4 Conducting a WIPT Survey This chapter describes specific steps for performing a site survey for WIPT .
4-4 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 4 C onducting a WIP T Survey How To Surve y for the WIPT Figur e 4-1 Ideal WIPT En vir onment Channel R e-Use Figure 4-2 shows the typica l chan nel r e-use fo r 802.1 1b and 802.
4-5 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 4 Condu cting a WIPT Surv ey How To Survey for the WIPT Manual Su rvey for the WIP T Y o u can use passive or activ e mode w hen you use A CU to run a si te survey . Figur e 4-3 shows the A CU Site Surv ey windo ws.
4-6 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 4 C onducting a WIP T Survey How To Surve y for the WIPT Figur e 4-4 ACU Site Surv e y Activ e Mode Click OK to retu rn to the Site Surve y screen. Click Start to start the site surv ey in acti v e mode.
4-7 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 4 Condu cting a WIPT Surv ey How To Survey for the WIPT The AirMagnet su rve yor works v ery well for surv e ying a site with an in stalled WLAN or for surv e ying a site wit hout a WLAN.
4-8 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 4 C onducting a WIP T Survey How To Surve y for the WIPT Figur e 4-6 AirMagnet Surv e y Activ e Mode T o survey a group of acc ess point s using the A ctive Mode tool, configur e the too l with an SSID that is configured on the access points.
4-9 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 4 Condu cting a WIPT Surv ey How To Survey for the WIPT Figur e 4-7 AirMagnet Client W alkabout When you selec t display mode on the bottom tool bar, SiteV iewer displays da ta collec ted during t he surve y .
4-10 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 4 C onducting a WIP T Survey How To Surve y for the WIPT Figur e 4-8 AirMagnet Sho win g Acce ss P o ints and Mer g ed Displ ay Figure 4-9 sh ows Site V iewer’ s four-p anel display .
4-11 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 4 Condu cting a WIPT Surv ey How To Survey for the WIPT Figur e 4-9 AirMagnet Four -P anel Displa y.
4-12 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 4 C onducting a WIP T Survey How To Surve y for the WIPT.
C HAPTER 5-1 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 5 Positioning Access Points and Ante nnas for Site Surveys When you perform a site surve y , it is important to position wire less equipmen t for opti mal co verage. This chap ter de scribe s best practic es for p osition ing access p oints and antennas.
5-2 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 5 Positioning Access Points and Antennas for Site Surveys Antenn as and Ant enna Posit ioning The access point in Figure 5- 2 provides b etter c overage beca use the re flecte d sig nal prod uces fewer nul ls and less multipa th than the I-beam pl acement.
5-3 Site Sur vey Guide fo r Deployin g Cisco 792 0 IP Phones OL-6315-01 Chapter 5 Positioning Access Po ints and A ntennas f or Site Surve ys Ant ennas an d Ante nna Pos itioni ng Figure 5-4 shows a p atch ante nna mount ed on a wa ll. The ant enna cab les are ro uted ab ov e the sus pende d ceili ng and are attach ed to a hi dden acc ess poi nt.
5-4 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Chapter 5 Positioning Access Points and Antennas for Site Surveys Antenn as and Ant enna Posit ioning Figure 5-6 shows a pat ch ant enna m ounted o n a suspe nded cei ling. The cable s are h idden an d are routed abov e the cei ling to the access point.
A- 1 Site Sur vey Guide fo r Deploying C isco 7920 IP Pho nes OL-6315-01 APPEND IX A Additional Sources of Information This a ppendix lists docume nts th at provi de addit ional i nfor mation about si te su rveys: • Cisco W ir eless IP Phone 7 920 D eploym ent Rec ommendat ions http://www .
A- 2 Site Survey Guid e for Depl oying Cisco 7920 IP Phones OL-6315-01 Appendix A Additional Sources of Information.
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