Manuel d'utilisation / d'entretien du produit 1 du fabricant Nortel Networks
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> Voice over Wireless LAN Technical Solution Guide Enterprise Solutions Engineering Document Date: December 15, 2005 Document Version: 1.0.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 2 Copyright © 2005 Nortel Networks All rights reserved. Decem ber 20 05. The information in this document is subj ec t to change without notice.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 3 Abstract This document is intend.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 4 TABLE OF CONTENTS 1. EXECUTIVE SUMMARY ............................................
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 5 3.2.2 WLAN Handse t 2210/11/12 ....................................................
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 6 1.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 7 1.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 8 QoS over the air techniques gen .
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 9 2.1 Applications Following is a brief description of the various voice applicatio ns.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 10 Dell Axim X5 (CPU >= 400 MHz) Dell Axim X3/C3i iPAQ h5550/h5555 Toshiba e750/e755 Toshiba e800/e805 2.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 11 location. The three architectures can be combi ned as desired, so they are not mutually exclusive choices.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 12 Figure 1: Distributed Campus architectur e 2.2.1.2 Centralized Campus A second architectural option is to centralize the se curity switches within a data center environment.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 13 Figure 2: Centralized Campus architecture 2.2.1.3 Branch Office The WLAN 2300 can also be deployed i n a small branch office environment.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 14 Figure 3: Branch Office architectu re 2.2.1.4 Combining architectures Up to now, architecture has been discus sed in binary terms—this t opology or that topology.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 15 Figure 4: Combined architecture 2.2.1.5 Third-party AP support In some cases, integrating the WLA N 2300 series into an existing fat-AP deployment may be required or desired.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 16 Figure 5: Network with third-party APs The WSS 2300 supports many model s of third-party APs with a few restriction s—see WSS 2300 Release Notes .
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 17 the ES PSU 10 can provide up to 75 W of power to PoE devices through the ES 460-24T -PO E.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 18 MLT to the L2 switch. In this configuration, all APs in the branch must be DAP s powered by the L2 switch or a separate PoE injector.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 19 beneficial to overall voice quality and media scalability. These are some of the dynamics to consider when making this c hoi ce.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 20 maximum call capacity is not that much highe r than th e 802.11b channel reuse case (only up to four times as much).
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 21 As a new client on the network .
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 22 Figure 7: Single telephony VLAN implementatio n Consolidating VoWLAN handsets into o ne VLAN/sub net has a few advantages.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 23 downstream and upstream traffic is tunn eled to and from the WSS 2300 that serves the assigned remote subnet.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 24 Figure 9: VPN design over L3 ne.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 25 Figure 10: Not recommended VoWLAN design The VPN feature is not designed for rem ote con n ectivity over a WAN back to the corporate network.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 26 Figure 11: Unsupported branch VoWLAN d esign 2.2.3 High availability designs You can configure many of the comp one nts de scribed in this document to provide high availability.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 27 radio power setting. Another option is to set t he minimum data rate before clien t-driven power changes occur to be 2 Mbps or less.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 28 other words, the user device will not be aware of any problem with the WLAN (other than that traffic flow has stopped) until the AP 2330 detect s the WSS 2300 failure.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 29 because three is the minimum number that can be tiled such that no two nei ghboring APs are controlled by the same WSS 2300.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 30 2.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 31 WPA-PSK plus MAC authentication is suitable. For WLAN Handsets 2212, Nortel also recommends use of IPsec from a securit y perspec tive.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 32 subtract from medium capacity by virtue of the resulting transmission errors and t he retransmission of corrupted frame s.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 33 particular handset that uses G.711 and 20 ms pa cket ization, you can get a maximum of eight calls on an AP.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 34 2.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 35 up the other half and were known to scale up to 10, then likely the resulting mix may scale to about nine calls per AP.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 36 WTM 2245s Calls per WTM 2245 To.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 37 and SVP in combination on the WLAN 2300 seri es.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 38 2.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 39 WSS 2380 regardless of m ode of ope ration on the AP 2330. When WMM is disabled, the AP 2330 has a binary manner of applying u ser p acket s to queues.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 40 Auto-RF is another set of features that can hav e a negative impact on the overall quality of calls.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 41 Figure 14: ES family s witches pe rforming packet classificatio n 2.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 42 The basic concept is to ha ve t.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 43 Figure 16: Nesting of VoIP within SVP and CAPP The ES at Interface B must implement IP filters in order to class ify SVP traffic, albeit indirectly.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 44 Figure 17: ERS 5510/5520 perfor.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 45 An ERS 5510/5520 connected to the WTM 2245 at Inte rface C can be co nfigured to simply trust the markings set by the WTM 2245.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 46 0x00 to 0x30 (110000) correspondi ng to the CS6 cl a ss. All other DSCP/ToS values are left untouched.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 47 types of devices side by side. The other major source of problems relates to security capabilities among clients.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 48 the WLAN Handset 2210/11/12 can impl ement it as well. However, the authentic ation mechanism may still be a problem if you desire 802.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 49 1. Assessment – Network Health Chec ks a nd WLAN Site Surveys (post-deploym ent) are critical assessment items.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 50 WLAN Site Survey Technical support for VoWLAN is cont ingent on cust omers performing a prior site survey of the WLAN.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 51 NetIQ Vivinet Assessor Performing a Network Heal th Che ck is probably the mo st critical step to ensuring a smooth rollout for any VoIP deployment.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 52 Meridian 1 products (as well as virtually all other Nortel product s).
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 53 Figure 20: ENMS 10.4 IPSM convergence vie w ENMS can provide down to physical sl ot port co nnectivity for the wired net wo rk.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 54 Communication Server 1000 Telep.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 55 Figure 22: NetIQ Vivinet AppM a.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 56 Vivinet Diagnostics is a product that can be purch ased sepa rately and used in conjunction with Vivinet AppManager.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 57 Enterprise Switch Manager (ESM).
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 58 3.2.2 WLAN Handset 2210/11/12 The WLAN Handset 2210/11/12 also support s numer ous DHCP extensions for assi gnin g various configuration options.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 59 the proper signaling server. This can of course get cumbersome if there are a large number of users who travel.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 60 ; WLAN access points must be SVP or View compatible as tested by SpectraLink Corp.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 61 determine holes in coverage that may create dropped calls or poor voice QoS.
Voice over Wireless LAN Solution Guide v1.0 December 2005 ______________________________________________________________________________________________________ Page 62 Contact us For product support and sales information, visit the Nortel web site at: www.
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