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Chapter 16 xDSL Port Setup

IES-1248-51V User’s Guide

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16.8 Virtual Channels

Defining virtual channels (also called Permanent Virtual Circuits or PVCs) allows

you to set priorities for different services or subscribers. You can define up to eight

channels on each DSL port and use them for different services or levels of service.

You set the PVID that is assigned to untagged frames received on each channel.

You also set an IEEE 802.1p priority for each of the PVIDs. In this way you can

assign different priorities to different channels (and consequently the services that

get carried on them or the subscribers that use them).

For example, you want to give high priority to voice service on one of the ADSL

ports.

Use the Edit Static VLAN screen to configure a static VLAN on the IES-1248-51V

for voice on the port.

Use the ADSL Edit Port Channel Setup screen to:

• Configure a channel on the port for voice service.

• Set the channel to use the PVID of the static VLAN you configured.

• Assign the channel a high priority.

16.8.1 Super Channel

The IES-1248-51V forwards frames belonging to VLAN groups that are not

assigned to specific channels to the super channel. Enable the super channel

option to allow a channel forward frames belonging to multiple VLAN groups (that

are not assigned to other channels). The super channel functions in the same way

as the channel in a single channel environment. One port can have only one super

channel.

16.8.2 LLC

LLC is a type of encapsulation where one VC (Virtual Circuit) carries multiple

protocols with each packet header containing protocol identifying information.

Despite the extra bandwidth and processing overhead, this method may be

advantageous if it is not practical to have a separate VC for each carried protocol,

for example, if charging heavily depends on the number of simultaneous VCs.

16.8.3 VC Mux

VC Mux is a type of encapsulation where, by prior mutual agreement, each

protocol is assigned to a specific virtual circuit, for example, VC1 carries IP, VC2

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