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Configuring Dial Services
7-2
308621-14.00 Rev 00
Data Compression
You can configure one of two compression protocols over any PPP backup circuit:
Nortel Networks proprietary data compression protocol, WCP
Hi/fn LZS
Enabling compression improves bandwidth efficiency by eliminating redundant
strings in data streams. This, in turn, improves network response times and yields
line-cost savings.
To implement data compression, you select either WCP or Hi/fn LZS as one of the
protocols for the backup circuit. Note that WCP does not work with any other
vendor’s compression protocol.
For more information about data compression, see Configuring Data Compression
Services.
Defining the Role of the Router in the Network
When you configure a router for dial backup, you must specify whether the router
initiates calls or waits to receive calls. The router placing the backup call waits
until the primary circuit fails. The other router then waits for the call without
trying to initiate one. If you do not specify the role of each router, they try to call
one another simultaneously and each router receives a busy signal.
You define the role of a router by defining the backup mode of the circuit. Do not
specify the same value for both sides of the circuit.
To modify the backup mode, see “Modifying Which Router Initiates a Call” on
page 13-10.
Bandwidth for Backup Circuits
Time-sensitive protocols or interactive protocols (for example, Telnet) may not
function correctly over a backup circuit that has less bandwidth than the primary
circuit. When user-response time is critical, backup circuits require the same
bandwidth as the primary circuits.
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