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Configuring ISDN and Leased Line Connections 2-55
CSU Backup
When you are using the leased line interfaces T1 and DDS, you can
configure an automatic CSU backup, to switch to the SA port during a
leased line failure.
CSU Backup Configuration
Enable SA Port as CSU Backup Yes
Requires Data Link Failure of... 30 Sec
Circuit Type... Switched Async
Data Rate (kbps)... 57.6
Modem Initialization String: AT&C1&D2E0S0=1
Modem Dialing Prefix: ATDT
Data Link Encapsulation is Async PPP
In the CSU Backup Configuration Screen, follow these steps to enable
the SA port as the CSU backup.
1. Select Enable SA Port as CSU Backup and toggle it to Yes.
2. Select Requires Data Link Failure of. From the pop-up menu,
select how long the failure must be to enable the backup. The
default is 30 seconds.
3. The remaining fields configure the SA port. See “Line
configuration for an SA/Serial line” on page 2-7 for more
information.
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