PLANET VIP-360PT - Manual (Page 24)

Qos Config
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 layer 2 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
transmission
Note: chart 2 use red and blue to identify the different VLAN, but in practice, VLAN uses different VLAN
IDs to identify.