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474 802.1Q VLAN description

• IP Phone 1140E

• IP Phone 1150E

The three-port switch does not interpret the 802.1Q header, but rather,

allows the packets to pass through unmodified. Priority is achieved on a

per port basis. The phone "port" traffic has higher priority over the Ethernet

port to which the PC connects.

An IP Phone can receive Broadcast frames from a PC data VLAN. Any

data network broadcast storm packets from the network are seen by the

IP Phone. Significant broadcast storms occurring on the DATA VLAN can

impact IP Phone performance. See “Enhanced VLAN Tagging” (page

476) for configuration information to filter network activity from impacting IP

Phone performance.

Enhanced 802.1P and 802.1Q support on the IP Phones improves voice

quality by taking advantage of the VLAN filtering available on the three-port

switch on the IP Phone 1110, IP Phone 1120E, IP Phone 1140E, IP Phone

1150E, IP Phone 1210, IP Phone 1220, IP Phone 1230, Phase II IP Phone

2002, Phase II IP Phone 2004, and IP Phone 2007.

The following functions are available on the three-port switch

• hardware VLAN filter

•

two TX (out) queues on each port —High Priority Queue (HPQ) and

Low Priority Queue (LPQ)

Therefore, traffic other than Voice VLAN can be filtered by enabling the

VLAN filtering feature and taking advantage of the hardware VLAN filter.

Voice traffic is always queued to the HPQ thereby that provide a higher

quality of service.

VLAN IDs

The VOICE and DATA VLAN ID fields can be specified on a per interface

basis. There is only one network interface on the IP Phone; however, the

IP Phone has two internal IDs, one for voice and one for data traffic. The

IP Phone firmware can detect and route the voice and data traffic.

The VLAN ID fields are global settings. That is, all voice packets

transmitted by the IP Phone have the same VOICE VLAN ID. If DATA

VLAN is enabled, the IP Phone adds the DATA VLAN ID to untagged

traffic. However, if the traffic arriving on the PC port is already tagged, the

frame passes through unchanged.

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 02.07

5 February 2009