Ositech comm Trumpcard Data/Fax Modem 사용자 설명서

5 - 6

Trumpcard 14400/28800 Modem

Section Five

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.