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28
7.3.2.3
QoS&VLAN
The VOIP phone support 802.1Q/P protocol and DiffServ configuration. VLAN functionality can use different VLAN
IDs by
setting voice VLAN and data VLAN. The VLAN application of this phone is very flexible.
In chart 1, there is a layer 2 that switches without setting VLAN. Any broadcast frame will be transmitted to the other
ports except the send port. For example, a broadcast information is sent out from port 1 then transmitted to port
2,3and 4.
In chart 2, red and blue indicate two different VLANs in the switch, and port 1 and port 2 belong to red VLAN, port 3
and port 4 belong to blue VLAN. If a broadcast frame is sent out from port 1, switch will transmit it to port 2, the
other port in the red VLAN and not transmit it to port3 and port 4 in blue VLAN. By this means, VLAN divide the
broadcast domain via
restricting the range of broadcast frame transition.
Notice:
chart 2 use red and blue to identify the different VLAN, but in practice, VLAN uses different VLAN IDs to
identify.
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