RJ-45 Cable (4-Wire)
SIGNAL PIN# PIN# SIGNAL
GND†2-----------------------7 GND†
RCV- 3-----------------------5 XMT-
XMT+ 4-----------------------6 RCV+
XMT- 5-----------------------3 RCV-
RCV+ 6-----------------------4 XMT+
GND†7-----------------------2 GND†
RJ-11 Cable (2-Wire)
SIGNAL PIN# PIN# SIGNAL
XMT+ 3-----------------------3 XMT+
XMT- 4-----------------------4 XMT-
RJ-45 Cable (2-Wire)
SIGNAL PIN# PIN# SIGNAL
XMT+ 4-----------------------4 XMT+
XMT- 5-----------------------5 XMT-
†Connection to ground is optional
4.2 WIRING FOR MULTIPOINT CIRCUITS
The Model 1004 supports multi-point applications using either a
star or daisy chain topology. Both topologies require special wiring, as
well as specific DIP switch settings for master and slave units. Note:
Refer to Section 3.2.2 for multipoint DIP switch settings.
4.2.1 STAR TOPOLOGY
Using a star topology, you may connect several Model 1004s
together in a master/slave arrangement. Maximum distance between
the units will vary based upon the number of drops, data rate, wire
gauge, etc. Call Technical Support for specific distance estimates.
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4.1.2 TWISTED PAIR CONNECTION USING RJ-11 OR RJ-45
The RJ-11 and RJ-45 connectors on the Model 1004’s twisted pair
interface are pre-wired for a standard TELCO wiring environment. The
signal/pin relationships are shown below:
RJ-11 SIGNAL RJ-45 SIGNAL
1...................GND†1 ...................N/C
2...................RCV- 2 ...................GND
3...................XMT+ 3 ...................RCV-
4...................XMT- 4 ...................XMT+
5...................RCV+ 5 ...................XMT-
6...................GND 6 ...................RCV+
7...................GND
8...................N/C
†Connection to ground is optional
AT&T standard modular color codes
When connecting two Model 1004’s, it is necessary to use a
crossover cable. The diagrams below show how a crossover cable
should be constructed for the following environments: 4-wire RJ-11,
4-wire RJ-45, 2-wire RJ-11 or 2-wire RJ-45.
RJ-11 Cable (4-Wire)
SIGNAL PIN# PIN# SIGNAL
GND†1-----------------------6 GND†
RCV- 2-----------------------4 XMT-
XMT+ 3-----------------------5 RCV+
XMT- 4-----------------------2 RCV-
RCV+ 5-----------------------3 XMT+
GND†6-----------------------1 GND†
†Connection to ground is optional
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