Case Communications syncro 1496, Reference Manual

Page: 91 / 192

7.3.2 Remote Digital Loopback
Using the Modem's Test Pattern Generator (Self-Test)
1. Establish a connection with the remote modem (which must be ITU-T
V.54 compatible).
2. On the local modem, depress the
TEST
button, then the
RDL
button, and
leave both buttons depressed. The
RUN
indicator should flash to show
that the test is in progress.
3. The
DSR
indicator will flash each time a test mismatch occurs.
4. To terminate the test, release the
TEST
and
RDL
buttons (in any order).
The total number of errors will be displayed on your terminal. If your
modem is operating correctly you will get the response
000 ERRORS
.
5. You may inject errors (to check that the test pattern is working
correctly) if an appropriate /T option is set, by using the
ENTER
button.
Using an External Test Source
1. Establish a connection with the remote modem (which must be ITU-T
V.54 compatible).
2. On the local modem, depress the
TEST
button followed by the
RDL
button,
then release the
TEST
button.
3. Attach a terminal or test set (set to synchronous mode) running from the
modem's clock to the DTE port of your modem.
4. Transmit a test pattern. If the pattern is echoed back, the remote digital
loop is working correctly. If the pattern is not echoed, or is corrupted,
check the LEDs:
– If only the
TXD
light flashes when the pattern is sent from the
terminal, check terminal settings and DTE cable. If these are
correct, the modem or line is faulty.
– If both the
TXD
and
RXD
lights flash when a pattern is sent from the
terminal, and no pattern or only a corrupted pattern is echoed back,
check terminal settings and the DTE cable. If these are correct, the
modem or line is faulty.
X450-310851 Issue 2 7-5 Rev.1