Avaya Configuring Dial Services Bedienungsanleitung Seite 73

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Implementation Notes for All Dial Services
114062 Rev. A 3-13
PRI Multirate
PRI multirate enables you to group B channels in multiples of 64 Kb/s to
dynamically allocate bandwidth on a call-by-call basis. Depending on how many
B channels you combine, the bandwidth can range from 128 Kb/s to 1472 Kb/s.
This allows you to choose the most suitable bandwidth for an application.
Applications such as dial backup and video conferences, benefit from the
flexibility of multirate service. These applications require more than a single B
channel but less than the full compliment of B channels for a PRI interface. Also,
service providers offer multirate service at low tariffs relative to other ISDN
services, which makes it a good option for many applications.
Multirate is especially useful where Frame Relay is used across an ISDN line. You
can group multirate dial lines to provide backup connections if the primary
connection fails.
Multirate service is available for all three dial services on the BLN and BCN,
using only the Dual or Single Port MCT1 and QMCT1 Link Modules. The
following switches for North America and Canada support multirate service:
5ESS
4ESS
DMS 100
For these switches, you can group 2 to 23 B channels, supplying bandwidth from
128 Kb/s to 1472 Kb/s.
Placing Multirate Calls
Multirate call setup across the D channel is simple. You set up a call only once no
matter how many B channels are in use. Both ends of a connection need to support
multirate for it to work.
You can place several multirate calls over the same PRI interface; however, the
total number of B channels for each call cannot exceed the number of lines in the
pool or the number of lines supported by the network switch. If there are no
available B channels in the line pool, the call fails.
Each call can operate at a different transmission rate, which is determined by the
number of B channels that you configure for each circuit and the outgoing phone
number.
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