17
18
When connecting two Model 2085RCs, it is necessary to use a
crossover cable. The diagrams below show how a
twisted pair 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 2085RC 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 2085RC star topology.
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-
