Avaya BCM 2.5 IP Telephony Průvodce konfigurací Strana 98

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98 Networking
P0937663 02.0
Enough link capacity
Table 13 on page 98 sorts the computations so that for each link, the available link capacity is
compared against the additional IP telephony load. For example, on link R4-R5, there is capacity
(568 kbit/s) to allow for the additional 96 kbit/s of IP telephony traffic.
Some network management systems have network planning modules that determine network
flows. These modules provide more detailed and accurate analysis as they can include correct
node, link and routing information. They also help to determine network strength by conducting
link and node failure analysis. By simulating failures, re-loading network and re-computed routes,
the modules indicate where the network can be out of capacity during failures.
Not enough link capacity
If there is not enough link capacity, consider one or more of the following options:
Use the G.723.1 codec. Compared to the default G.729 codec with 20 ms payload, the G.723.1
codecs use 29% to 33% less bandwidth.
Upgrade the bandwidth for the links.
Table 13 Link capacity example
Link Utilization (%)
Available
capacity
kbit/s
Incremental IP telephony
load
Enough
capacity?
End
Points
Capacity
kbit/s Threshold Used Site pair
Traffic
kbit/s
R1-R2 1536 85 75 154 Santa Clara/
Ottawa
Santa Clara/
Tokyo
15.5 Yes
R1-R3 1536
R2-R3 1536
R2-R4 1536
R4-R5 1536 85 48 568 Santa Clara/
Richardson
Ottawa/Tokyo
Santa Clara/
Tokyo
24 Yes
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