Patton electronic 3058, 3054, 3056 user manual Local Loopback, DTE Remote Loopback

5.2 TEST MODES

The Model 305X Series has three test modes: Local Loopback, Remote Loopback and DTE Remote Loopback. This section tells you how to use these test modes to isolate cabling or multiplexer problems.

5.2.1 Local Loopback

The Local Loopback test allows you to evaluate the integrity of the DTE cable and the local Model 305X. Any data sent to the local Model 305X in this test mode will be echoed (returned) back to the user device. (See Figure 8, below.) For example, characters typed on the keyboard of a terminal will appear on the terminal screen.

Figure 8. Local Loopback Test

To use the local loopback test, follow these instructions.

1.Set the front panel switch of the mux being tested to local loopback. The corresponding LED should glow.

2.On a terminal connected to one of the sub-channel ports, key a character string. You should see those same characters echoed back on the terminal screen.

3.If the keyed character string does not echo on the terminal screen, check all sub-channel connections for continuity and proper pinning.

5.2.2Remote Loopback

The Model 305X offers a second test that evalulates the integrity of the local and remote multiplexers. With the local multiplexer in REMOTE LOOPBACK mode and the remote multiplexer set to NORMAL, the local mux sends a low frequency pulse to the remote mux over the twisted pair wire. If the two muxes and the twisted pair cable are functioning properly together, you will see the remote multiplexers RECEIVE DATA LEDs blinking together. If you have a RJ- 45 loopback adapter connected to the remote sub-channel ports, the remote multiplexers TRANSMIT DATA LEDs and the local multiplexers RECEIVE DATA LEDs will also blink.

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5.2.2 DTE Remote Loopback

The DTE Remote Loopback test allows you to evaluate the multiplexers and their connection path by using the local DTE. In order to fully test both units as well as the twisted pair connection path, you will need install the enclosed RJ-45 loopback adapter into the specific remote sub-channel modular jack. Figure 9 shows an example of the Remote Loopback test with the RJ-45 loopback adapter attached to the remote multiplexer.

Figure 9 . Line Test

To use this test follow the instructions below:

1.Install the RJ-45 loopback adapter into the sub-channel of the remote multiplexer as shown above in Figure 9. For instance, if you are testing channel 1, install a loopback adapter into the sub-channel 1 RJ-45 jack on the remote multiplexer.

2.Set the front panel switch of the local multiplexer and the remote multiplexer to NORMAL.

3.On a terminal connected to the sub-channel port to be tested, key a character string. You should see those same characters echoed back on the terminal screen after they have passed through the local multiplexer, through the cable and remote multiplexer, and then back to the through the cable to the multiplexer and the attached terminal.

4.If the above test exhibits bit errors or does not work at all, check all sub-channel and main channel connections for continuity an proper pinning.

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