When connecting two Model 1020s 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 1020s use a
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
‡ The Model 1020 is not sensitive to polarity
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| 1 | - Blue |
1 | - Blue |
| 2 | - Orange |
2 | - Yellow |
| 3 | - Black |
3 | - Green |
| 4 | - Red |
4 | - Red |
| 5 | - Green |
5 | - Black |
| 6 | - Yellow |
6 | - White |
| 7 | - Brown |
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| 8 | - Slate |
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Standard AT&T color codes
4.1.2 TWISTED PAIR CONNECTION USING TERMINAL BLOCKS
If your application requires you to connect two pairs of bare wires to the Model 1020, you will need to open the case to access the terminal blocks. The instructions on the following pages 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.
1.Open the unit by gently inserting a screw driver between the
Once the unit has been opened, you will be able to see the terminal blocks located at the rear of the PC board.
2.Strip the outer insulation from the twisted pairs about one inch from the end.
3.Strip back the insulation on each of the 2 twisted pair wires about .25”.
7 | 8 |