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TRENDnet User's Guide
Voice VLAN
This chapter 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 imbedded into the first part
of each MAC address of an Ethernet network device. You can find the OUI
of an IP phone in the first three complete bytes of its MAC address.
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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 address 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 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.
However, it is possible that you can find more than one OUI from the same
manufacturer among the IP phones you are installing. It is also possible
that your IP phones are from two or more different manufacturers in
which case you will find different OUIs for each manufacturer. If you
identify more than one OUI among the IP phones being installed, then one
MAC address representing each individual OUI must be configured in the
voice VLAN. You can enter a total of 10 OUIs.
Dynamic Auto-Detection vs Static Ports
Prior to configuring the voice VLAN, you must configure a tagged VLAN
which is the basis for the voice VLAN configuration. The VLAN must be
configured with one or more tagged or untagged ports that will serve as
the voice VLAN uplink/downlink. By default, a tagged or untagged port is
a static member of a tagged VLAN. The ports that you choose to configure
as dynamic Auto-Detection ports must be connected directly to an IP
phone. When you initially define the ports of a tagged VLAN for your voice
VLAN configuration, they must be configured as a "Not Member" ports.
The "Not Member" ports are eligible to dynamically join the voice VLAN
when voice data is detected with a predefined OUI in the source MAC
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