Ositech comm Trumpcard Data/Fax Modem - Manual (Page 82)

5 - 4 Trumpcard 14400/28800 Modem
Section Five
Local Analog Loopback with Self-
Generated Pattern
This test verifies the integrity of the local Modem transmit and receive
circuits. 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.
For this test, the Modem must be in command mode.
To start the test:
1. Enter AT&T8 [ENTER] and wait for a while. The Modem will not
respond visibly.
2. Enter AT&T0 [ENTER] to mark the end of the test. The Modem will
respond with a three-digit number indicating the test results.
During this test, a continuous data sequence is sent by the local Modem
transmitter and picked up by the local Modem receiver. The transmitted
and received data sequences are compared and the Modem then returns
a three-digit number indicating test results. If the result is 000, the local
Modem transmit and receive circuits have passed the test.