User`s manual

U.S. Robotics I-modem Command Reference
Testing • Page 14-8
You don't need to type anything during this test. The I-modem sends only its Þnal error
count to your screen.
1. Send the command AT&M0&N3S14.0=0 to prepare the I-modem for testing.
This command disables error control, Þxes the connection rate at 2400 bps, and makes
the I-modem return to Command mode
when you type the escape code (+++).
2. Establish a connection with the remote device.
3. If you haven't already done so, arrange with the remote user to cooperate with the test.
If necessary, set the remote device to acknowledge the remote digital loopback request.
For example, older U.S. Robotics modems need to be set to S16=8.
4. Send the AT&T7 com-mand to the I-modem. The I-modem enters remote digital loop-
back mode, and, if the I-modem is an external model, the MR status light ßashes.
The I-modem sends its built-in test pattern to the remote device, which loops it back to
your I-modem. You will not see the data on your screen.
5. Send the escape code, +++, and then AT&T0 to end the test. You can also end the test
by sending ATH, ATZ, or ATZ! Be careful, though, because ATZ and ATZ! reset the I-
modem in addition to ending the test.
If you issue an invalid command, the I-modem sends an ERROR message. If you set