Owner`s manual
59
Appendixes
LOOPBACK CABLE
1
8
Figure C-4. Loopback Cable
DESCRIPTION
This cable lets you test the MultiDSU64K when a second DSU is not
available. It tests the DSU by having the DSU generate a signal,
then the 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.
SCHEMATIC
RJ48S
1
2
3
4
5
6
7
8
6"
RECEIVE
RECEIVE
TRANSMIT
TRANSMIT
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.