Multitech MT56DSU-S, User Manual

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34
Appendix
Loopback Cable (MTS P/N 45640100)
1
8
Figure B-5. Loopback Cable Connector
DESCRIPTION
This cable lets you test the MT56DSU-S when a second DSU is not available. When the DSU generates a
signal, this cable “loops” the signal back to the DSU for comparison to the original signal sent. You can
order this cable (#45640100) from Multi-Tech, or build one using the instructions below. Refer to Chapter 4
for test procedures.
SCHEMATIC
RJ48S
1
2
3
4
5
6
7
8
6"
RECEIVE
RECEIVE
TRANSMIT
TRANSMIT
Figure B-6.
BUILD INSTRUCTIONS
1. Strip cable insulation 3/4"
2. Cut wires 3, 4, 5, 6 off.
3. Strip wires 1, 2, 7, 8 1/4"
4. Solder wires 1 and 8 together.
5. Solder wires 2 and 7 together.
6. Cover solder connections with 1" of shrink tube.