Configuring/Installing Quality Of Service - Siemens HiPath 3000 User Manual

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Installation

Configuring/installing Quality of Service

2.2 Configuring/installing Quality of Service
General
optiClient 130 can use the Windows QoS packet scheduler (Quality of Service) for network traf-
fic control in order to optimize voice quality. This service gives telephony packages priority over
"normal" data packets. The following applies depending on the Windows variant installed on
the client PC:
Windows 2000 / XP:
●
The QoS features required are supported by the operating system. The required configu-
ration steps are described below.
under Windows 98SE:
●
Only limited QoS features, if any, are supported. No further configuration steps are re-
quired for activation.
If QoS is to be implemented, the service must be installed and configured on the client PC.
The following may occur when transferring data in IP networks:
Time problems as a result of large e-mail attachments and Web surfing
●
Network congestion as a result of multiple requests for the same Web page
●
Reduced voice quality as a result of:
●
– delays
– jitter
– packet loss
Quality of Service incorporates various methods to ensure the transfer of certain properties in
packet-oriented networks (IP).
It is therefore important to ensure a minimum bandwidth for the duration of the transfer for Voice
over IP, for example. The available bandwidth of a transmission path (a 64 Kbps ISDN B chan-
nel, for example) is divided up if several applications run simultaneously via IP. As a result, pa-
cket losses leading to poor voice quality may occur in the case of a voice connection.
In HiPath networks, various types of traffic are transported via a single IP infrastructure. Quality
of Service aims to meet data and voice traffic requirements.
A high priority must be assigned to voice traffic to prevent it from being suppressed by data traf-
fic. In addition, it must be specified that high-priority traffic is to be transferred before low-priority
traffic. These specifications are performed in Layer 2 and 3:
In Layer 2, the three bits are used in the 802.1p field (the part of the 802.1Q day).
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A31003-G2540-A100-3-76A9, 04/2003
optiClient 130 V4.0, User Manual