Multi-Tech Systems MT56DSU-S - Manual (Page 35)

35
Appendix
Back-To-Back Cable (MTS P/N 45050000)
1
8
Figure B-7. Back-toBack Cable Connector
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 Receive circuits of the good DSU. You can order this cable from Multi-
Tech (#45050000), or build one using the instructions below. Refer to Chapter 4 for test procedures.
SCHEMATIC
RJ48S
1
2
3
4
5
6
7
8
7"
RJ48S
8
7
6
5
4
3
2
1
Figure B-8.
BUILD INSTRUCTIONS
1. Strip cable installation 3/4".
2. Strip wires 1,2,7 and 8 on one end of cable and 8,7,2 and 1 on other end 1/4".
3. Cut unstripped wires off.
4. Solder wire 1 on one connector to 8 on the other.
5. Solder wire 2 on one connector to 7 on the other.
6. Solder wire 7 on one connector to 2 on the other.
7. Solder wire 8 on one connector to 1 on the other.
8. Cover solder connections with 1" of shrink tube.