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Implementation Notes for All Dial Services
114062 Rev. A 3-15
The following two examples describe how rate adaption works.
Example 1
Between two end nodes, there are seven switches, one of which uses a 56 Kb/s
trunk line (
Figure 3-7). 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. To do this,
the router drops one of the 8 bits of data from each byte and sends only 7 bits of
useful data at a time.
Figure 3-7. 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 3-8),
the router adapts the data rate for the outgoing call to 56 Kb/s to meet that of the
destination device, which can handle data only at 56 Kb/s. To effect this, set the
outgoing phone number’s Adaption Rate parameter to 56 Kb/s.
Figure 3-8. 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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