Siemens 8000 manual IP Network Parameters Quality of Service QoS, Layer 2 / 802.1p

Administration

IP Network Parameters

3.3IP Network Parameters

3.3.1Quality 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.

3.3.1.1Layer 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.

Three Bits Used for CoS (User Priority)

PREAM. SFD DA SA

TAG

4 Bytes

PT

DATA

FCS

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	A31003-O1010-M100-10-76A9, 13/06/2008
	HiPath 8000 - OpenStage Family, Administration Manual