Digital Loopback Test - Black Box SME-4M ME251A-R3 User Manual

Synchronous Modem Eliminator (SME-4M)
The digital loopback test is for asynchronous applications only. Proceed as follows to initiate the test.
1. Press the loopback switch (the switch must remain in the IN position) on the front panel
to loopback at the digital interfaces for both devices connected to the SME-4M.
2. Enter data at the terminal or computer. The data should be returned to the DTE device
exactly as it was entered.
3. Release the DLB switch (the switch must remain in the OUT position) to end the test.
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4. Digital Loopback Test