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Implementation Notes for All Dial Services
114062 Rev. B 4-15
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 one
B channel but not the full complement of B channels for PRI. Also, ISDN service
providers offer multirate service at lower tariffs than other ISDN services.
Multirate is especially useful when 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 ASN, using only the
Dual MCT1 Net Module, and 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:
AT&T 5ESS
AT&T 4ESS
DMS-100
For these switches, you can group from 2 to 23 B channels, supplying bandwidth
from 128 Kb/s to 1472 Kb/s.
Placing Multirate Calls
Both ends of a connection must support multirate for it to work. You enable
multirate and specify the transmission rate of each multirate call when you
configure an outgoing phone number for a circuit. (Refer to Chapter 12 for
specific instructions.) Each multirate call can operate at a different transmission
rate. You determine the transmission rate by specifying the number of B channels
the circuit can use for a phone number. The greater the number of B channels, the
faster the transmission rate because the circuit has more bandwidth.
You can place several multirate calls over the same PRI connection; 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.
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