Setting Wan Bandwidth Limits Between Network Regions - Avaya Communication Manager Administrator's Manual

Setting WAN bandwidth limits between network regions

Using the Communication Manager Call Admission Control: Bandwidth Limitation (CAC-BL)
feature, you can specify a VOIP bandwidth limit between any pair of IP network regions, and
then deny calls that need to be carried over the WAN link that exceed that bandwidth limit.
Bandwidth limits can be administered in terms of:
Kbit/sec WAN facilities
●
Mbit/sec WAN facilities
●
Explicit number of connections
●
No limit
●
It is highly recommended that you have the following design information before setting the
bandwidth limits and mapping the connections:
1. Network topology and WAN link infrastructure.
2. An understanding of the Committed Information Rate (CIR) for the WAN infrastructure.
3. Overlay/design of the Network Regions mapped to the existing topology.
4. Codec sets administered in the system.
5. Bandwidth is assumed to be full duplex.
The following table can be used to help assess how much bandwidth (in Kbits/sec) is used for
various types of codecs and packet sizes. The values shown assume a 7 byte L2 WAN header
(and are rounded up).
Table 1: Bandwidth usage (in Kbits/sec) based on packet size and codec selection
Packet
Size
G.711
G.729
G.723-6.3
G.723-5.3
These values, when compared to the actual bandwidth used for 8 byte as well as 10 byte L2
WAN headers are not significantly different. In some cases, the rounded up values shown
above are greater than values used for 10 bytes.
Setting WAN bandwidth limits between network regions
10 ms 20 ms
102 83
46 27
NA NA
NA NA
30 ms 40 ms
77 74
21 18
19 NA
18 NA
50 ms 60 ms
72 71
16 15
NA 13
NA 12
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