Overlay Loader; Overload Monitor; Resident Trunk Diagnostic; System Loader - Nortel Meridian 1 General Maintenance Information

Overlay Loader

This resident program locates, loads, and checks all overlay programs. It
automatically activates the Midnight and Background Routines. You can load
programs manually by entering commands through the system terminal or
maintenance telephone. Once the program is loaded, you see the program
mnemonic (such as TRK for Trunk Diagnostic) on the system terminal.
You can also use the Overlay Loader to enable, disable, and display the status
of the disk drive unit.

Overload Monitor

The system continuously monitors the volume of system messages. If it
detects too many error messages from a line or trunk card, the system
activates the Overload Monitor program. The Overload Monitor disables the
faulty card and generates system messages with the mnemonic OVD.
Refer to X11 System Messages (553-3001-411) for help in interpreting system
messages.

Resident Trunk Diagnostic

This program automatically monitors all trunk calls and records apparent
faults on each trunk. If the number of faults on a trunk exceeds the threshold
for that trunk, the program generates a system message identifying the trunk
and the type of fault.
A failure on a trunk may keep the trunk from detecting incoming calls. The
threshold mechanism cannot detect such a failure, so this program also
records how many days it has been since each trunk received an incoming
call. If you suspect some incoming calls are not being processed, you can use
the command LMAX in Trunk Diagnostic 1 (LD 36) to identify the trunk with
the maximum idle days.

System Loader

The System Loader program loads all call-processing programs and data and
starts memory-checking diagnostics. After all required programs and data
have been loaded and all checks performed, the System Loader is erased from
system memory, the Initialize Program runs, and normal call processing
begins. This process is called a sysload or system reload.
Software maintenance tools
Meridian 1 General Maintenance Information
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