Administration
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Step by Step
Layer 2/3 settings
The optiPoint 600 office supports QoS Layer 2 i.e.
IEEE 802.1D prioritisation tags and VLAN Id tagging as
well as the QoS layer 3 i.e. DiffServ codepoint.
The following menus are provided to manage the
Layer 2/3 settings and to set the Virtual LAN identifier:
• Quality of Service
• Virtual LAN page 32
Quality of Service
The QoS Layer 2 is implemented in the Ethernet driver.
The application on the phone sends packets of data (ei-
ther signalling or voice) to the Ethernet driver to be
transmitted on to the network. These packets contain
the QoS Layer 3 information - by default voice packets
are marked as 12 and signalling as 18 but these values
can be set between 0 and 63. The Ethernet driver can-
not determine whether the packets contain voice or sig-
nalling data but it can determine the layer 3 priority. This
priority is used and translated into a layer 2 priority val-
ue. This is done using a look-up table using the layer 3
value as an index into the table. The Ethernet driver has
to be initialised with the look-up table before any pack-
ets are sent onto the network. The loop-up table has
two non-zero values by default for index positions 12
and 18. The default values at these index positions are
6 and 3 respectively but these can be altered to have
values in the range 0 to 7. Prior to transmitting each
packet on the network the Ethernet driver adds the rel-
evant layer 2 priority and Vlan Id value (along with other
layer 2 addressing information) onto the front of the
packet. When such a packet arrives at a busy QoS en-
abled switch it is the layer 2 priority value which deter-
mines whether it jumps ahead of other packets in the
switches queue.
Enter the Administration menu. Access page 17.
Select "Configuration".
Select "Network settings".
Select "Direct LAN access".
Select "Layer 2/3 settings".
Select "Quality of service".
Make the desired entries or changes (Text input see
page 41).
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