Epson ActionNote 880C User Manual - Fax/Data Modem - Page 60

TESTING, Local Analog Loopback, computer or terminal are functioning correctly

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4 - TESTING The modem provides five testing features to identify fault location when transmission quality is not good: local digital Ioopback, local analog loop back, local analog Ioopback with self-test, remote digital loopback, and remote digital loopback with self-test. These tests are initiated with the &Tn command described in Chapter 2. 4.1 Local Analog Loopback The local analog loopback test checks the integrity of the local computer or terminal and the local modem. During the test. the local modem internally loops data sent from the local computer or terminal back to the same computer or terminal as shown in Figure 4-1. During the test, data is not transmitted to the remote modem. If characters are looped correctly during this test, both the modem and the local computer or terminal are functioning correctly, If incorrect characters appear on the screen, either the local computer or terminal or the local modem is in error. To perform a local analog loopback, put the local modem in the command state. If it is on-line, issue the escape command + + +, to return to the command state. 4 - TESTING 53

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4 - TESTING
The modem provides five testing features to identify fault location when transmission
quality is not good: local digital Ioopback, local analog loop back, local analog Ioopback
with self-test, remote digital loopback, and remote digital loopback with self-test.
These tests are initiated with the &Tn command described in Chapter 2.
4.1 Local Analog Loopback
The local analog loopback test checks the integrity of the local computer or terminal
and the local modem. During the test. the local modem internally loops data sent
from the local computer or terminal back to the same computer or terminal as
shown in Figure 4-1. During the test, data is not transmitted to the remote modem.
If characters are looped correctly during this test, both the modem and the local
computer or terminal are functioning correctly, If incorrect characters appear on
the screen, either the local computer or terminal or the local modem is in error.
To perform a local analog loopback, put the local modem in the command state.
If it is on-line, issue the escape command + + +, to return to the command state.
4 - TESTING
53