14 TESTING THE C ONNECTIONThis chapter contains information about:n Testing the Business Modem using AT&Tnn Testing the Business Modem using S-Register 16Overview Your modem can perform digital and remote digital loopback tests. Youcan use these tests to check the operations of the transmitter andreceiver, or to locate a problem with a remote device or a telephone line.Testing is done by sending the AT&Tn command or by setting RegisterS16. Only one test can be performed at a given time. If you send a testcommand while the modem is in test mode, you'll receive an ERRORmessage.All loopback testing conforms to ITU-T Recommendation V.54.
