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Key Expansion Module initialization
The IP Phone Key Expansion Module (KEM) starts and begins initialization
after it is connected to an IP Phone.
In some circumstances on the Centrex IP Client Manager platform, it may
be necessary for the user to log off and log on again after attaching the KEM
to the IP Phone, before the KEM becomes operational.
KEM initialization process
Phase Description
KEM performs self-test The self-test confirms the operation of the module’s local memory,
CPU, and other circuitry. During the self-test, the module display
lights up.
If the display does not light up, or lights up and then goes blank, or fails
to begin flashing, contact your system administrator.
KEM establishes
communication with
the base IP phone
The KEM display flashes until it establishes communication with the IP
phone.
If the display does not stop flashing, communication cannot be
established with the IP Phone. Contact your system administrator.
KEM downloads key
maps
KEM uses key maps to download feature key assignments. Key maps
are downloaded after communication is established with the IP Phone.
The KEM screen is blank until the key maps are downloaded.
Labels appear beside
the keys on the module
After the three initialization phases are complete, labels appear beside
the keys on the KEM. Keys assignments are made by the administrator.
After the initialization sequence is complete, you can begin to use the
additional feature and line (DN) keys that are available through the KEM.
If two modules are connected to the IP Phone, the first one in the series
must be functioning in order for the second module to operate. This is
because the second module depends on the first module to provide power
from, and communication with, the IP Phone.
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