Ip Softphone 2050 Support; Three-Port Switch Support - Nortel 2001 Installation And Operation Manual

Page 356 of 430

IP Softphone 2050 support

Three-port switch support

553-3001-368 Standard 7.00
Appendix B: 802.1Q VLAN description
For more information on configuring 802.1Q on the IP Audio Conference
Phone 2033, see "First time installation" on
The IP Softphone 2050 supports 802.1Q with Windows 2000. By default,
when 802.1Q is enabled, the priority bits of all frames are set to 6 and the
VLAN ID is set to 0 (a restriction of Windows 2000).
For more information, see the IP Softphone 2050 section: "QoS tab" on
page 232.
The IP Phond 2002 and IP Phone 2004 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 is connected.
An IP Phone can receive Broadcast frames from a PC's data VLAN. Any data
network broadcast storm packets from the network are seen by the IP Phone.
This type of traffic does not adversely affect the IP Phone.
Enhanced 802.1P and 802.1Q support on the IP Phones will improve voice
quality by taking advantage of the VLAN filtering available on the three port
switch on the BCM 1100/1101.
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 providing a higher quality
of service.
August 2005
page 322.