Ip Network Parameters; Quality Of Service (Qos); Layer 2 / 802.1P - Siemens HiPath 2000 Administration Manual

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Administration

IP Network Parameters

3.3 IP Network Parameters
3.3.1

Quality of Service (QoS)

The QoS technology based on layer 2 and the two QoS technologies Diffserv and TOS/IP Pre-
cedence based on layer 3 are allowing the VoIP application to request and receive predictable
service levels in terms of data throughput capacity (bandwidth), latency variations (jitter), and
delay.
3.3.1.1

Layer 2 / 802.1p

QoS on layer 2 is using 3 Bits in the 802.1q/p 4-Byte VLAN tag which has to be added in the
Ethernet header.
The CoS (class of service) value can be set from 0 to 7. 7 is describing the highest priority and
is reserved for network management. 5 is used for voice (RTP-streams) by default. 3 is used
for signaling by default.
Data required
• Layer 2: Activates or deactivates QoS on layer 2.
Value range: "Yes", "No".
Default: "Yes".
• Layer 2 voice: Sets the CoS (Class of Service) value for voice data (RTP streams).
Value range: 0-7.
Default: 5.
• Layer 2 signalling: Sets the CoS (Class of Service) value for signaling.
Value range: 0-7.
Default: 3.
• Layer 2 default: Sets the default CoS (Class of Service) value.Value range: 0-7.
Default: 0.
3-10
PREAM. SFD DA SA
HiPath 2000/3000/5000 - OpenStage Family, Administration Manual
Three Bits Used for CoS
(User Priority)
TAG
PT DATA
4 Bytes
A31003-S2010-M100-10-7619, 27/08/2008
FCS