Multitech MT64DSU Manuale del Proprietario Scaricare il pdf (Pagina 29)

Chapter 3 - Testing

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.

3. On the

“good”

DSU, set DIP switch #9 to the UP position.

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

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Multitech MT64DSU Manuale del Proprietario Pagina 29