Nortel Networks Circuit Card - Manual (Page 413)

NT6D80 MSDL card Page 413 of 906
Circuit Card Description and Installation
Maintenance
Routine maintenance consists of enabling and disabling MSDL cards and
downloading new versions of peripheral software. These activities are
performed by an authorized person such as a system administrator.
Troubleshooting the MSDL consists of determining problem types, isolating
problem sources, and solving the problem. A craftsperson normally performs
these activities.
CS 1000S, CS 1000M, and Meridian 1 systems have self-diagnostic
indicators as well as software and hardware tools. These diagnostic facilities
simplify MSDL troubleshooting and reduce mean-time-to-repair (MTTR).
For complete information concerning system maintenance, refer to
Communication Server 1000M and Meridian 1: Large System Maintenance
(553-3021-500).
For complete information regarding software maintenance programs, refer to
Software Input/Output: Administration (553-3001-311).
MSDL states
MSDL states are controlled manually by maintenance programs or
automatically by the system. Figure 87 on
page 414 shows MSDL states and
the transitions among them. These are the three states the MSDL may be in:
• Manually disabled
• Enabled
• System disabled
The following sections describe the relationships between these states.
Manually disabled
In this state, the MSDL is not active. The system does not attempt to
communicate or attempt any automatic maintenance on the MSDL.