US Robotics COURIER Uživatelský manuál stáhnout pdf (Strana 164)

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U.S. Robotics I-modem Command Reference

Testing • Page 14-2

Testing the I-modem (Using &T)

Perform digital loopback and remote digital loopback testing by using the &T command.

You can type in your own data during testing or use the I-modem's internal test pattern and

error detector.

Note Disable error control (using the &M0 command) before testing. If the I-

modem is detecting errors and retransmitting the affected data, your results

will be invalid.

Digital Loopback Testing (&T3)

This test can help you locate a problem with a remote device or with the tele-phone line.

Figure 14-1 shows the data ßow during digital loopback testing.

Figure 14-1. Data Flow During Digital Loopback

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