Avaya Configuring Dial Services Bedienungsanleitung Seite 125

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Implementation Notes for All Dial Services
114062 Rev. B 4-17
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, refer to Chapter 8 and Chapter 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
4-7). 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 4-7. Rate Adaption for a Network with a 56 Kb/s Trunk Line
Example 2
For a connection between an ISDN and switched 56 Kb/s network (Figure 4-8),
the router adapts the data rate for the outgoing call to 56 Kb/s to match that of the
destination device, which can handle data only at 56 Kb/s. To do this, you set the
adaption rate for the outgoing phone number to 56 Kb/s.
Figure 4-8. Rate Adaption for a Switched 56 Kb/s Network
Router
Router
64 Kb/s
Switch
Switch
Switch Switch
Switch
Switch
Switch
56 Kb/s trunk
DS0015A
64 Kb/s
ISDN
connection
56 Kb/s
Router
Router
ISDN
Switched
56 Kb/s
DS0016A
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