CALLMASTER®
IV Voice Terminal User and Installation Instructions
12
The 2-Wire/4-Wire Line Adapter
The 2-wire/4-wire line adapter (PEC: 32302; Comcode: 407124114 for a single
adapter; PEC: 32303 for a package of 25 adapters) is available to
accommodate situations in which customers need to upgrade from an analog-
type RJ11C jack to an 8-wire RJ45X-type jack. This adapter eliminates the
need to remove RJ11C jacks which are presently being used and install new
RJ45X jacks in their place.
Please read the CAUTION statement directly below before beginning the
installation. If all connections are correct, plug the adapter into the RJ11C jack
to provide the proper wiring translation to the DCP terminals.
NOTE: This adapter works ONLY when using a DCP terminal on a
2-wire DCP digital line circuit card (for example, the TN2181 or TN2224). It will
NOT work if you are connecting a DCP terminal to a
4-wire, 4-port, or 4-wire, 8-port DCP line circuit card (such as the TN754B,
TN754, TN413, SN270B, or SN270).
CAUTION: In a previous installation of the premises line jacks,
customers may have wired the jack connections as bridged or in
parallel. These jacks must be rewired, at customer expense, in order for
DCP terminals to function properly in either
2-wire or 4-wire installations. There must be NO INTERCONNECTIONS
between the wire pairs used for 2-wire and 4-wire operations. Bridging
or paralleling of these pairs can result in damage to the terminal or can
cause the PBX line circuit card to remove power to the terminal. All
interconnections between these pairs MUST BE REMOVED BEFORE
the DCP terminals are connected to the jack.
DCP Line Interface
The DCP line interface is a standard D8W 8-wire modular cord. The 8 line-jack
pins are numbered in increasing order from left to right when facing the jack
with the tab slot down. The table on the next page shows pin assignments fo r
the line cord and jack block interface
.