Lucent Technologies DEFINITY Administrator's Manual page 107

Glossary
O
On-premise Lines
Communication lines (usually twisted-pair) that are used to connect the
PBX to the DEFINITY telephone.
P
PBX
Private Branch Exchange.
R
Rack-Mount Switch Module
An interface card that fits into one of the 12 slots in the Multi-Mount
Extender Rack. The Rack-Mount Switch Module has all the functionality of
the Standalone Switch Module.
Remote Module
The DEFINITY Extender module that connects to the remote DEFINITY
telephone.
Issue 3 July 1997
GL-3