Ositech comm Trumpcard Data/Fax Modem - Manual (Page 84)

5 - 6 Trumpcard 14400/28800 Modem
Section Five
Remote Digital Loopback with Self-
Generated Pattern
This procedure tests the remote Modem port, the telephone line, the local
serial and Modem ports. The test is only functional when the Modem is in
direct mode (&Q0) and the COM port baud rate is set to 14400 bps
(Trumpcard 14400) / 28800 bps (Trumpcard 28800) or less.
This test is similar to the Remote Digital Loopback test.
In this test, the local Modem sends the remote Modem a special test data
sequence and the remote Modem echoes the data back. The local
Modem examines the returned data and establishes an error count each
time a mismatch is detected.
To run this test:
1. Establish a connection with a remote Modem.
2. Enter AT&T4 [ENTER] to ensure that the remote operator has set the
Modem to accept a Remote Digital Loopback request.
3. Enter AT&T7 [ENTER] to initiate the remote digital loopback test. The
Modem will send a test pattern to the remote Modem.
4. Enter AT&T0 [ENTER] to end the test. The Modem will return a three-
digit number showing the test results. If the result is 000, the local and
remote modems, and the telephone line have passed the test.