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Installing Your Voice Terminal
General Notes on Wiring
and Installation
Regardless of which configuration is in use, ALL wiring between the PBX and the
terminal MUST consist of twisted-pairs, including the modular line cord. The line
cord must be a D8W, which consists of four twisted-pairs, or an AT&T approved
equivalent.
Twisted-pair wiring is used to make lines less sensitive to crosstalk. Therefore,
failure to use twisted pair wiring may result in less-than-optimum performance of
the terminal and may also contribute to problems with the line.
An 8-wire modular cord MUST be used for all 4-wire and any 2-wire installations
requiring auxiliary power.
You do NOT need to change any settings on the voice terminal for 2-wire or
4-wire installations. The voice terminal is able to detect whether it is in a 2-wire
or a 4-wire configuration.
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 8400-Series terminals.
NOTE:
This adapter works ONLY when using an 8400-Series terminal on a 2-wire
16-port (TN2181) digital line circuit card. It will NOT work if you are
connecting an 8400-Series 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 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 the 8400-Series 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
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