Telenetics V.3600 Series, User Manual

Page: 116 / 273

Test Mode Operation
7-4 V.3600
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 on page 7-4.
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 (Figur e7-2).
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.
Figure 7-2. Local Analog with Test Pattern
Testing the Remote Modem
Use LDL, RDL, and RDL/TP in the online data mode to test the remote
modem and phone line. Enter the escape sequence after making a
connection to return to command mode. The appropriate test command,
&T3
,
&T6
, or
&T7
, can then be entered to initiate an online test.