
A-2 Cisco 2524 and Cisco 2525 Router User Guide
Installing WAN Modules
Warning Before working on a chassis or working near power supplies, unplug the power
cord on AC units; disconnect the power at the circuit breaker on DC units. (To see translated
versions of this warning, refer to the appendix “Translated Safety Warnings.”)
Installing WAN Modules
You can install WAN modules in the router without removing the chassis cover. Each router
chassis can accommodate up to three WAN modules—two synchronous serial and one
ISDN. The choice of synchronous serial WAN modules is as follows:
• 2-wire switched 56-kbps DSU/CSU
• 4-wire 56/64-kbps DSU/CSU
• Fractional T1/T1 DSU/CSU
• Five-in-one synchronous serial
The choice of ISDN WAN modules is as follows:
• ISDN BRI
• ISDN with integrated NT1 device
The ISDN WAN modules are designed so that you cannot insert them into the synchronous
serial WAN slots. A blank slot cover is installed over unused slots.
Take the following steps to install a WAN module:
Step 1 Turn OFF power to the router.
Caution Unlike some other Cisco routers, the WAN modules are not hot-swappable (that
is, you cannot remove or install them when power to the router is ON). Be sure to turn OFF
power to the router before installing or removing WAN modules. Failure to do so may
damage or halt the router.
Step 2 Remove the WAN module from the ESD-protective shipping material.
Step 3 Slide the WAN module into the appropriate slot along the card guides until it is
completely seated in the connector inside the router (see Figure A-1).
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