COURIER HIGH SPEED MODEMS
4.Type recognizable data so that you can verify it when it is looped back to the screen.
5.End the test. If you set S18, the modem automatically stops the test at the timeout, exits AL mode and responds OK.
If you didn't set Register S18, wait one second and type +++
to bring the modem back to Command mode. If DIP switch 9 is OFF, the modem also hangs up and ends the test.
If DIP switch 9 is ON, type AT&T0 to end the test. Or send either ATH or the command that resets the modem, ATZ. The latter two commands end the test and hang up the modem. The modem responds OK. If the modem sends an ERROR message, you have issued an invalid command.
6.If there were no errors, reset the modem to &M4, for error control, unless you've issued the ATZ reset command.
NOTE: If the modem is in
&T8
This AL option causes the modem to send an internal test pattern to its transmitter and loop it back to the receiver. An internal error detector counts any errors and, when the test is ended, sends the number of errors or 000 (no errors) to the screen.
Since you don't type anything during this test, and the modem does not send anything to the screen, this option verifies only the modem. If there are no errors but your problem continues, it may be at the computer interface.
1.If you are testing an HST or Dual Standard modem, set your terminal or software to 2400 bps.
2.The modem must be in Command mode. If you wish, set Register S18 as a test timer, as explained earlier.
