A T1, E1, or 56k CSU interface can be configured as the primary WAN port for the Passport 4400, or as a backup port which becomes active only when the primary netlink fails. The Passport 4400 can also support two physical CSU connections, one for the primary and one for the backup port. For information on how to configure primary and backup WAN ports, see Managing Primary and Backup Ports.
This section discusses the following topics:
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