Multitech MT56DSU-R Owner's Manual Page 55

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Appendix B - Interface Signals and Connector Pinouts
55
BACK-TO-BACK CABLE
DESCRIPTION
This cable lets you test a suspect DSU by connecting it to a known
good DSU. It tests the suspect DSU by connecting its Transmit
signal to the good DSUs Receive circuits. You can order it from
Multi-Tech (CADSURBB), or build one using the instructions below.
Refer to Chapter 4 for test procedures.
SCHEMATIC
BUILD INSTRUCTIONS
1. Strip cable insulation 3/4" .
3. Strip wires 1and 3 on one end of cable and 4 and 8 on other
end a 1/4"
2. Cut unstriped wires off.
4. Solder wire 1on one connector to 8 on the other.
5. Solder wire 3 on one connector to 4 on the other..
6. Cover solder connections with 1"of shrink tube.
82023101.p65 2/12/01, 2:52 PM55
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