Nortel Meridian 1 Manual page 928

12-164 Upgrades to Meridian 1 option 81
553-3001-250 Standard 14.00 August 1996
Before you begin to switch operation from the existing system to Core and
Network columns, the columns should be powered up and all cables that can
be pre-routed should be in place. At that point, there are two methods for
performing the upgrade:
— If the system can be out of service for the time it will take to move the
cards, you can shut down the existing system and move all of the network
cards at one time. (If existing cabinets are being removed and replaced
by the columns, this method will take longer, but it may be unavoidable.)
— If the system must remain in operation, you can move one network card
at a time. This will take longer than moving all of the cards at one time,
but will cause limited, localized interruptions in service rather than
taking the system completely out of service. Note that even with this
phased transfer of service, there will be no telephone connections
between the old and new systems.
When the upgrade is complete, all CPU and network functionality will reside
in the Meridian 1 columns. Existing peripheral equipment is retained but
cabled to the network cards now located in the modules in the option 81.
The hardware required for this upgrade is provided in the Core and Network
Module Upgrade Package. All existing equipment that will be retained must
meet minimum vintage requirements and be compatible with X11 release 21.
You must order replacements for equipment that does not comply. Refer to
Product compatibility (553-3001-156) for vintage requirements.