TRENDnet TPE-3012LS, User Manual, Page: 70 / 187

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TRE
NDnet User’s Guid e
TPE-3012LS / TPE-3018LS
66
5. Click Apply .
6. In the top right, click Save to save the configuration settings to NV-RAM/startup
configuration.
7. Click OK .
Voice VLAN
This chapt er contains a description of the Switch’s Voice VLAN feature and the
procedures to create, modify, and delete a voice VLAN configuration.
The Voice VLAN feature is specifically designed to maintain high quality, uninterrupted
voice traffic through the switch. When talking on a voice over IP phone, a user expects
to have no interruptions in the conversation and excellent voice quality. The Voice VLAN
feature can be configured to meet these requirements.
CoS with Voice VLAN
The Voice VLAN CoS parameter maintains the voice quality between the ingress and
egress ports of the switch. CoS must be enabled for the Voice VLAN CoS priority to take
effect. The CoS priority level that you config is applied to voice traffic on all ports of the
voice VLAN. Normally, most (non-Voice) Ethernet traffic transverses the switch through
lower-order egress queues. To avoid delays and interruptions in the voice data flow, the
CoS priority level assigned to the voice VLAN should be mapped to a higher-order queue
and the scheduling algorithm should be set to Strict Priority. These settings ensure that
the voice data packets are processed before other types of data so that the voice quality
is maintained as the voice data passes through the switch.
Organization Unique Identifier (OUI)
Each IP phone manufacturer can be identified by one or more Organization Unique
Identifiers (OUIs). An OUI is three bytes long and is usually expressed in hexadecimal
format. It is embedded into the first part of each MAC address of an Ethernet network
device. You can find the OUI of the IP phone in the first three complete bytes of its MAC
address.
Typically, you will find that all of the IP phones you are installing have the same OUI in
common. The switch identifies a voice data packet by comparing the OUI information in
the packet’s source MAC addre ss with an OUI table that you configure when you initially
set up the voice VLAN. This is important when the Auto-Detection feature for a port and
is a dynamic voice VLAN port.
When you are configuring the voice VLAN parameters, you must enter the complete
MAC address of at least one of your IP phones. An “OUI Mask” is automatically
generated and applied by the Web Management Utility software to yield the
manufacturer’s OUI. If the OUI of the remaining phones from that manufacturer is the
same, then no other IP phone MAC addresses need to be entered into the configuration.