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Configuring WAN Line Services
10-2
308648-14.00 Rev 00
Types of Multiline Circuits
You can configure multiline services over the following types of WAN media:
Synchronous (Nortel Networks Standard, PPP, and frame relay protocols)
•T1/E1
•MCE1/MCT1
HSSI
The data paths that form a multiline circuit must share the same bandwidth, MTU,
and encapsulation method. T1, E1, MCT1, MCE1, HSSI, and Nortel Networks
Standard synchronous lines share the same encapsulation method, so you can
group any of these lines to form a multiline circuit as long as they share the same
bandwidth and MTU.
Frame relay and PPP each have unique encapsulation methods. You cannot mix
these line types with any other line type when you create a multiline circuit.
Physical and Logical Circuits
There are two types of multiline circuits:
Circuits that include several physical lines
Circuits on one physical line with several data paths that have separate
addresses (logical lines)
In Figure 10-1
, Multiline Circuit A groups three synchronous lines into one
circuit. Multiline Circuit B consists of one physical synchronous line, but has
three data paths with separate addresses.
A multiline circuit reacts to individual data paths coming up and going down by
adding to and subtracting from its pool of active data paths, and can operate with
some of its data paths down.
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