Patton electronics 2701/B User Manual
Also see for NetLink 2701/B: Specification sheetUser manualUser manual
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Contents
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20Figure 7. Local Loopback for a Network Termination ApplicationTo perform a LL test, follow these steps:1. Activate LL. This may be done in one of two ways:ó Place the switch on the front panel in the ìLocalî position.ó Activate the ìLLî signal on the DTE (2701/B and 2701/C only).If you are not sure which lead is the ìLLî signal, please refer toAppendix D.2. Verify that the data terminal equipment is operating properly andcan be used for a test.3. Perform a V.52 BER (bit error rate) test as described in sectionìUsing the V.52 (BER) Test Pattern Generatorî on page 22. If theBER test equipment indicates no faults, but the data terminal indi-cates a fault, follow the manufacturerís checkout procedures for thedata terminal. Also, check the interface cable between the terminaland the Model 2701.Operating Remote Digital Loopback (RL)The Remote Digital Loopback (RL) test checks the performance of boththe local and remote NetLink-E1ô, as well as the communication linkbetween them. Any characters sent to the remote NetLink-E1ô in thistest mode will be returned back to the originating device (i.e, characterstyped on the keyboard of the local terminal will appear on the local termi-nal screen after having been passed to the remote NetLink-E1ô andlooped back). |
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