Black Box 3600 MODEM manual Grant/Deny RDL Request &T4, &T5, Remote Digital Loopback &T6

Test Mode Operation

Grant/Deny RDL Request &T4, &T5

Local operators can deny a request from the remote modem for remote digital loopback.

To allow your modem to be placed in RDL by a remote operator, enter

AT&T4

To prevent your modem from entering RDL, enter

AT&T5

Remote Digital Loopback &T6

The initiating modem signals the remote modem to go to Digital Loopback. The remote modem receives and then retransmits data back to the local modem. If Digital Bilateral Loopback is enabled on the remote modem, the remote DTE is looped back to itself (Figure 7-4).

Figure 7-4. Remote Digital Loopback with Digital Bilateral Loop Enabled at the Remote Site

After making the data connection, enter the escape sequence to return to command mode. Entering &T6 places the remote modem in digital loopback provided the remote operator has entered the &T4 command to allow an RL request. Enter a test message and verify the message is being looped back to your terminal screen. If the message is incorrect, use the analog loopback tests on both modems to isolate the problem. If both modems run analog loopback without errors, the problem could be with the phone line.

7-6 Modem 3600