Patton electronic 1004ABRC user manual Signal PIN# XMT+, Multipoint Twisted Pair Connection

When connecting two Model 1004ABRCs, 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

	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

4.4.2 MULTIPOINT TWISTED PAIR CONNECTION

The Model 1004ABRC supports multipoint applications using a star daisy chain topology (Section 3.0 describes proper multipoint configu- ration). Maximum distance between the units will vary based upon the number of drops, data rate, wire gauge, etc. Call Patton Technical Support for specific distance estimates. The diagram below shows how to wire the two-pair cables properly for a Model 1004ABRC star topolo- gy. Note that the ground connection is not needed.

HOST	FIRST SLAVE	SECOND SLAVE
XMT+	RCV+	RCV+
XMT-	RCV-
		RCV-
RCV+	XMT+
		XMT+
RCV-	XMT-
		XMT-

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