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DSU Back-to-Back Test
This test lets you connect two DSUs with a back-to-back cable to
verify proper DSU operation. Using a DSU that is known to be
operational, you can test a second DSU that is suspect.
1.
Obtain a DSU Back-to-Back cable (#45050000) from Multi-Tech,
or assemble one. Refer to Appendix B for instructions on
building the Back-to-Back cable.
2.
Plug the cable into each DSU's LINE jack.
On the "good" DSU, set DIP switch #9 to the UP position.
3.
4.
Set one DSU to internal clocking and the other DSU to DDS
clocking.
5.
If you send data from your DTE, it should be "looped back" to
your DTE. If you have access to a Bit Error Rate Tester, this can
be used in place of the DTE.
Figure 3-8. Back-to-Back Testing
Chapter 3 - Testing
29
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