Avaya IP Telephony Konfigurationsanleitung PDF herunterladen (Seite 162)

162 Efficient Networking

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Some network management systems have network planning modules that determine network

flows. These modules provide more detailed and accurate analysis because 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.

Other intranet resource considerations

Bottlenecks caused by non-WAN resources do not occur often. For a more complete evaluation,

consider the impact of incremental IP telephony traffic on routers and LAN resources in the

intranet where the IP telephony traffic moves across LAN segments that are saturated, or routers

whose central processing unit (CPU) utilization is high.

Implementing the network, LAN engineering

To minimize the number of router hops between the systems, connect the gateways to the intranet.

Ensure that there is enough bandwidth on the WAN links shorter routes. Place the gateway and the

LAN router near the WAN backbone. This prevents division of the constant bit-rate IP telephony

traffic from bursty LAN traffic, and makes easier the end-to-end Quality of Service engineering

for packet delay, jitter and packet loss.

Further network analysis

This section describes how to examine the sources of delay and error in the intranet. It also

discusses several methods for reducing one-way delay and packet loss.

The key methods are described under the following headings:

• “Components of delay” on page 163

• “Reduce link delay” on page 163

• “Reducing hop count” on page 164

• “Routing issues” on page 165

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Avaya IP Telephony Konfigurationsanleitung Seite 162