Avaya 4600 Series manual QoS, Ieee 802.1D and 802.1Q

4600 Series IP Telephone LAN Administrator’s Guide

#GETAPP

IF $MODEL4 SEQ 4630D01A GOTO SCREENSETS IF $MODEL4 SEQ 4624D01A GOTO BIGSETS IF $MODEL4 SEQ 4612D01A GOTO BIGSETS IF $MODEL4 SEQ 4606D01A GOTO SMALLSETS

#SCREENSETS

SET APPNAME 4630_000301.BIN

GOTO END

#BIGSETS

SET APPNAME 4624_000301.BIN

GOTO END

#SMALLSETS

SET APPNAME 4606_000301.BIN

#END

GET 46XXSETTINGS.SCR

QoS

The 4600 Series IP Telephones support both IEEE 802.1D/Q and DiffServ, and may in the future support other, possibly proprietary, procedures for implementing Quality of Service. In addition, other network-based QoS initiatives such as UDP port selection do not require support by the telephones, but nonetheless can contribute to improved QoS for the entire network.

IEEE 802.1D and 802.1Q

IEEE’s 802.1Q standard defines a tag that can be added to voice and data packets. Most of the information associated with this tag deals with Virtual LAN (VLAN) management, but 3 bits are reserved for identifying packet priority. These 3 bits allow any one of 8 priorities to be assigned to a specific packet. As defined in the standard, the 8 priorities are, from highest to lowest:

■7: Network management traffic

■6: Voice traffic with less than 10ms latency

■5: Voice traffic with less than 100ms latency

■4: “Controlled-load” traffic (mission-critical data applications)

■3: Traffic meriting “extra-effort” by the network for prompt delivery (for example, executives’ e-mail)

■2: Reserved for future use

■0: Traffic meriting the network’s “best-effort” for prompt delivery (the default priority)

QoS

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