System Initialization - Avaya Nortel Communication Server 1000 Reference

System initialization

When new base or application software is installed on a CS 1000E, CS 1000M Cabinet, and
Meridian 1 PBX 11C Cabinet, the download decision is made during system initialization. The
actual MSDL base software download is done in background mode and can take several
minutes to complete, depending on switch traffic and the size of the MSDL base software.
Card enabling or application enabling
If a normal download enable command is executed, the MSDL base code and application is
conditionally downloaded to the DDCH card. This conditional download depends on the result
of the check made by the CPU on the MSDL base code and application software.
If a forced download enable command is executed in LD 96, the MSDL base code and
application are forced down to the DDCH card, even if the base and application software is
already resident on the DDCH card. To complete a forced download, the following conditions
must be met:
• the DDCH card must be enabled
• the D-channel port must be disabled
Card reset
After a card reset, the MSDL base code and the D-channel application software are validated
by the CPU. The software is stored in flash EPROM on the DDCH card and need not be
downloaded. But if the software is missing due to new installation, corruption, or loadware
version mismatch, the CPU automatically downloads the base/application into the DDCH
card.
Background audit
If a background audit of the card and associated applications finds that a download is required,
the card is queued in the PSDL tree. Downloading is performed in background mode based
on the entries in the PSDL tree.
Circuit Card Reference
Download operation
July 2011 565