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WLAN IP Telephony Manager 2245 planning 55
Table 3
Multiple WLAN IP Telephony Manager 2245-80 capacities (cont’d.)
Number of
WLAN IP
Telephony
Manager
2245
units
Calls per
WLAN IP
Telephony
Manager
2245
units
Total
calls Erlangs
Number of
wireless
handsets
10% use
Number of
wireless
handsets
15% use
Number of
wireless
handsets
20% use
8
55
440 415 4000 2767 2075
9
55
495 469 4500 3127 2345
10
55
550 524 5000 3493 2620
11
55
605 578 5500 3853 2890
12 54 648 621 6000 4140 3105
13 54 702 674 6500 4493 3370
14 54 756 728 7000 4853 3640
15 54 810 782 7500 5213 3910
16 54 874 836 8000 5573 4180
Table 4
Multiple WLAN IP Telephony Manager 2245-10 and 2245-20 capacities
Number of
WLAN IP
Telephony
Manager
2245
units
Number of handsets
WLAN IP
Telephony
Manager
2245-10
Number of handsets
WLAN IP
Telephony
Manager
2245-20
110 20
220 40
330
not applicable
440
not applicable
For example, if there are two subnets for handsets in a campus and some
handsets are directed to one subnet and some to the other, there are two
Call Admission Control domains operating independently. Specifically,
if both specified a limit of seven calls for each AP, it is possible to have
seven calls admitted by each WLAN IP Telephony Manager 2245 on the
same AP—therefore, the AP is oversubscribed by 2:1.
If multiple subnets are required, the best way to support them is to
leverage the Layer 3 WLAN IP Telephony Manager 2245 design. With
this design, the WLAN IP Telephony Manager 2245 units are clustered in
one subnet and the traffic from the handset is routed from the appropriate
WLAN IP Telephony Manager 2245 unit in the cluster. Although this is a
supported configuration, all the engineering guidelines for latency, jitter,
Nortel Communication Server 1000
WLAN IP Telephony Installation and Commissioning
NN43001-504 03.04 Standard
23 September 2008
Copyright © 2004–2008 Nortel Networks
.