Specifications

XMU+ Installation and Maintenance Guide rev.07 45
Preparing to Cable the XMU+
Matching Connector Pinouts to XMU+ Line Cards
Most XMU+ line cards are cabled using the RJ-21 50-pin Connector on page 45.
Exceptions include:
 The MOH line card, which uses the RCA/Phono Connectors on page 46.
 T1 line cards, which use a digital signal to connect to the XMU+.
All connectors are used to connect and wire the line cards to a PBX, as described in
the various PBX interface tables found in Cabling XMU+ Line Cards on page 54.
RJ-21 50-pin Connector
Use the Amphenol RJ-21 50-pin Connector
to connect the following line cards to
telephone lines or PBX trunks:
 Hybrid Analog line card. See To cable
Hybrid Analog line cards on page 54 for
more information.
 Low Impedance line card. See To cable
Low Impedance cards on page 54 for
more information.
 MWR line card. See To cable MWR line
cards on page 55 for more information.
Each line on the Amphenol 50-pin
connector has a tip (-)/ring (+) pair. The
tip/ring pair performs like a regular
telephone extension operating in the Ring
Start Mode (see About XMU+ Operating
Modes on page 68 for more information).
For lines operating in other modes, the
tip/ring pair provides the message audio
path.