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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
When connecting two Model 1005s, it is necessary to use a
“crossover” cable. The diagram below shows how a crossover cable
should be constructed for an environment where both Model 1005s use
a 4-wire RJ-11 connector. Similar logic should be followed when using
RJ-45 connectors or a combination of the two.
SIGNAL PIN# COLOR
‡
COLOR PIN# SIGNAL
GND
†
1 Blue---------------------White 6 GND
†
RCV- 2 Yellow------------------Red 4 XMT-
XMT+ 3 Green------------------Black 5 RCV+
XMT- 4 Red---------------------Yellow 2 RCV-
RCV+ 5 Black-------------------Green 3 XMT+
GND
†
6 White-------------------Blue 1 GND
†
†
Connection to ground is optional
‡
Standard color codes—yours may be different
4.1.2 TWISTED PAIR CONNECTION USING TERMINAL BLOCKS
If your RS-232 application requires you to connect two pairs of
bare wires to the Model 1005, you will need to open the case to access
the terminal blocks. The following instructions will tell you how to open
the case, connect the bare wires to the terminal blocks, and fasten the
strain relief collar in place so that the wires won't pull loose.
4.0 INSTALLATION
Once you have properly configured the DCE/DTE switch, you are
ready to connect the Model 1005 to your system. This section tells you
how to connect the Model 1005 to the twisted pair and RS-232
interfaces, and how to operate the Model 1005.
4.1 CONNECTION TO THE TWISTED PAIR INTERFACE
The Model 1005 supports data-only communication between two
RS-232 devices at distances to 17 (27.2 km) miles and data rates to
19.2 Kbps. There are two essential requirements for installation:
1. These units work in pairs. Therefore, you must have one Model
1005 at each end of a two twisted pair interface.
2. To function properly, the Model 1005 needs two twisted pairs of
metallic wire. The pairs must be unconditioned, dry metallic wire,
between 19 and 26 AWG (the higher number gauges may limit
distance). Standard dial-up telephone circuits or leased circuits
that run through signal equalization equipment are not acceptable.
For your convenience, the Model 1005 is available with three
different twisted pair interfaces: RJ-11 jack, RJ-45 jack and terminal
blocks with strain relief.
4.1.1 TWISTED PAIR CONNECTION USING RJ-11 OR RJ-45
The RJ-11 and RJ-45 connectors on the Model 1005's twisted pair
interface are pre-wired for a standard TELCO wiring environment (see
Figure 1). The table on the following page shows the signal/pin
relationships.
5 6
1 - Blue
2 - Orange
3 - Black
4 - Red
5 - Green
6 - Yellow
7 - Brown
8 - Slate
1 - Blue
2 - Yellow
3 - Green
4 - Red
5 - Black
6 - White
Figure 1. AT&T standard modular color codes