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3
3
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2
2
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3
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Q
Q
O
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S
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The VOIP phone support 802.1Q/P protocol and DiffServ configuration. VLAN functionality can use
different VLAN IDs by setting signal/voice VLAN and data VLAN. The VLAN application of this
phone is very flexible.
In chart 1, there is a switch 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 2,3 and 4.
In chart 2, red and blue circles 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, the 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 divides the broadcast domain via restricting the
range of broadcast frame transmission.
Note: Chart 2 uses red and blue to identify the different VLANs; but in practice, VLAN uses different
VLAN IDs to identify them.
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