Avaya BCM 2.0 IP Telephony Manual de usuario descargar pdf (Pagina 34)

34 Engineering guidelines

Enterprise Edge 2.0 IP Telephony Configuration Guide P0911590 Issue 02

Saturation refers to too many packets on the intranet. Packets can be dropped on

improperly planned or damaged LAN segments.

Packets that arrive at the destination late are not placed in the jitter buffer and are

lost packets. See Adjust the jitter buffer size section on page 33.

Routing issues

Routing problems cause not needed delay. Some routes are better than other routes.

The Traceroute program allows the user to detect routing anomalies and to correct

these problems.

Possible high delay differences causes are:

• routing instability

• wrong load splitting

• frequent changes to the intranet

• asymmetrical routing

Implementing QoS in IP networks

Corporate intranets developed to support data services. Accordingly, normal

intranets are designed to support a set of QoS objectives dictated by these data

services.

When an intranet takes on a real-time service, users of that service set additional

QoS objectives in the intranet; some of the targets can be less controlled compared

with the targets set by current services, while other targets are more controlled. For

intranets not exposed to real-time services in the past but now need to deliver IP

telephony traffic, QoS objectives for delay can set an additional design restriction

on the intranet.

One method is to subject all intranet traffic to additional QoS restrictions, and

design the network to the strictest QoS objectives. A exact plan to the design

improves the quality of data services, although most applications cannot identify a

reduction of, say, 50 ms in delay. Improvement of the network results in one

correctly planned for voice, but over planned for data services.

Another plan is to consider using QoS mechanisms in the intranet, the purpose of

which is to provide a more cost-effective solution to engineering the intranet for

non-homogenous traffic types.

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Avaya BCM 2.0 IP Telephony Manual de usuario Pagina 34