5-1
CHAPTER 5 Hardware Maintenance
Procedures
This chapter discusses various hardware maintenance procedures for the
Cabletron ATM switches. Items discussed include the following:
• Network Module Replacement
• Power Supply Replacement
• Fan Tray Replacement
• Switch Control Processor Replacement
• Switch Board Replacement
5.1 Network Module Replacement
5.1.1 Overview
The network modules in all Cabletron ATM switches are hot-swappable,
meaning that they can be removed and replaced with the unit under power.
Network modules should only be hot-swapped for purposes of replacing a
failed unit. Therefore, they should be replaced with a network module of the
same type, the same Series, and with the same number of ports. A network
module’s type is the class to which the network module belongs (e.g., OC-3,
E3, TAXI, etc.).
If a network module is removed and replaced by a network module of
another type or by a network module with fewer ports, all configuration
information for that network module’s slot will be deleted, and the new net-
work module will be configured with the defaults for its type. For example, if
a 4-port Series A OC-3c is replaced by a 4-port Series C OC-3c, the Series C
network module will use the same configuration of the Series A network
module. Any additional configurable variables will contain OC-3c defaults. If
a 4-port OC-3c is replaced by a 4-port DS3, all configuration information for
that slot will be deleted and the DS3 will be initialized with DS3 defaults. If a
6-port DS3 is replaced by a 2-port DS3, all configuration information for the
slot will be deleted, and the new DS3 initialized with DS3 defaults. If a net-
work module is placed into a previously vacant slot, it will be initialized into
the default state appropriate to that type of network module.