Avaya Configuring Dial Services Manual de usuario Pagina 139

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Implementation Notes for All Dial Services
308621-14.00 Rev 00
5-17
Rate Adaption
Rate adaption enables the router to accommodate data transmission at a rate of
56 Kb/s over a 64 Kb/s B channel. Nortel Networks supports only 56 Kb/s adapted
to 64 Kb/s using the ITU-T V.110 type of rate adaption. You can enable rate
adaption for BRI and PRI service.
For incoming calls, the router automatically adapts the data received at 56 Kb/s to
the 64 Kb/s channel, based on information in the call setup packet. For outgoing
calls, the router sets the rate to either 64 Kb/s or 56 Kb/s, depending on how you
configure the rate adaption parameters. To determine which rate to select, ask your
service provider for information about the network and connecting to the
destination device.
For information about configuring rate adaption, see “Modifying the Adaption
Rate” on page 11-9 and “Modifying a Call’s Adaption Rate” on page 15-12. The
following two examples describe how rate adaption works.
Example 1
Between two end nodes there are seven switches. One switch uses a 56 Kb/s trunk
line (Figure 5-6
). To accommodate this switch, the router sends data at 56 Kb/s
over the 64 Kb/s line that connects the switch to the network. The router drops one
of the eight bits of data from each byte and sends only seven bits of data at a time.
Figure 5-6. Rate Adaption for a Network with a 56 Kb/s Trunk Line
Router
Router
64 Kb/s
Switch
Switch
Switch Switch
Switch
Switch
Switch
56 Kb/s trunk
DS0015A
64 Kb/s
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