3Com REMOTE ACCESS SYSTEM 1500, Management Manual

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Configuring Expansion Units
35
Replacing I/O
Modules in the Port
Expansion Unit
The slot in each Port Expansion Unit retains configurations of specific I/O
modules that are installed. As a result, the Port Expansion Unit uses the
following rules when you replace I/O modules (analog modems, U
interface ISDN, or S/T interface ISDN):
■
If you remove an I/O module from a Port Expansion Unit and replace it
with the same type of module into the same slot, the Port Expansion
Unit retains the configuration of that module.
■
If you remove an I/O module from a Port Expansion Unit and replace it
with different type of I/O module in the same slot, the Port Expansion
Unit may not recognize the new I/O module.
To verify if the Port Expansion Unit recognizes the correct I/O modules,
use the
show pem <pem name>
command in the CLI.
After you install a new I/O module, if the Port Expansion Unit does not
correctly recognize it, complete the following steps:
1 Disconnect the FireWire cable to the Router Unit.
2 Delete the Port Expansion Unit:
delete pem <pem-name>
3 Save the configuration:
save all
4 Reconnect the FireWire cable.
5 Reset the Port Expansion Unit (via the front panel).
6 After the boot procedure is complete (blinking green on the Port
Expansion Unit), save the configuration:
save all
Disconnecting
Expansion Units
After an expansion unit is physically disconnected from a stack, the
list
stack
command still recognizes the removed expansion unit. To
permanently remove the expansion unit from the list, issue the
delete
unit type (pem, pau)
command, then the
save all
command.
To list available ports, use the
list interfaces
command. This
command lists ports on physically connected expansion units.
Expansion Unit
Configuration after
Rebooting
When you add an expansion unit to a stack, issue the
save all
command in the CLI; otherwise, the expansion unit configuration will not
be saved after a reboot.