Table of Contents
Advertisement
Test Mode Operation
Note
Figures 7-1 through 7-5 include LED test indications.
These indications are valid when DTE options are set by
factory option set #1 and RTS is active from the DTE.
Where indicated, RD and/or TD may be on, off, or flashing
depending on the type of DTE and its operating state.
Test the local DTE and cable by entering the &T1 command. Enter a
test message and verify it is echoed on the screen. If the message is not
returned exactly as entered, the terminal equipment or data cable is at
fault.
To determine if the data cable is defective replace it with a properly
configured cable with electrical continuity. If the cable checks out but
the problem remains, the DTE is defective.
If all local equipment checks out, proceed to the Testing the Remote
Modem section in this chapter.
Issue an escape sequence followed by &T1 to exit analog loopback.
Local Analog Loopback with Self Test &T8
When the modem is offline in command mode, enter the &T8 command
to put the modem in self test local analog loopback (Table 7-2).
The modem transmits a test pattern. The test pattern is looped back to
the receiver and checked for errors. Entering the &T command causes
the modem to exit self test analog loopback. The modem responds with
a three digit value between 0 and 255 representing the number of errors
during test pattern detection. If errors occur, repeat the test to verify the
consistency of the problem.
7-4
V.3400
Advertisement
Table of Contents
