Cabletron Systems ZX-250 manual 6 I/O Modules, Removing a Switch Module

Performing Hardware Maintenance Switch Administration

Backplane

Power Supply

Extended Switch Module

IO Modules

CPU Board

Main Switch Module

Figure 4-5 Internal components of the SmartCell ZX-250 ATM switch

4.9.6I/O Modules

The I/O Modules (IOMs) plug into the DIN connectors on the top of both the MSM and the ESM (see Figure 4-5). All ZX-250 switches can (with an ESM installed) support up to four IOMs, providing a total of 15 ATM ports (Port B4 is reserved for use by the CPU). To access, add, or replace IOMs, the switch module to which they correspond must be accessed. IOMs are user serviceable.

4.9.7Removing a Switch Module

The SmartCell ZX-250 ATM switch’s MSM is located in the bottom switch module slot; the ESM (if present) is located in the top slot. When accessing the switch modules, use the following procedure:

s• Power off the unit by switching the power switch (located in the back) to off.

¢• Disconnect all user port cables from I/O modules. It may be useful to label cables for easy reinstallation.

••Ground yourself using a Cabletron-approved ESD device and appropriate safety procedures.

T• Remove the front bezel from the chassis base by gently separating the six spring-loaded fasteners on the bezel from the chassis base using a non-marring pry tool or your fingers (see Figure 4-6).

Q• Remove filler blanks for any uninstalled I/O modules, if applicable.

4-34 SmartCell ZX-250 User Guide