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Step 2
This step determines the performance of the local and remote modems
and the telephone circuits. It also determines each modem's ability to
receive a transmitted signal from the other site, properly equalize and
decode the signal and then loop this regenerated signal into the trans-
mitter for transmission back to the other modem. This test applies to
both leased line and dial line operation.
a. Configure the local modem for REMOTE DIGITAL
LOOP WITH TEST PATTERN. This signals the remote
modem to go into digital loop. The remote modem
receives and then retransmits the data back to the local
mode. If the digital bilateral loop is enabled at the remote,
the remote DTE is looped back to itself.
b. An alternative to the above procedure is to request the
operator at the remote modem to configure his modem for
LOCAL DIGITAL LOOP. Configure the local modem for
TEST PATTERN. The remote modem receives and
retransmits the data back to the local modem.
c. The TEST PATTERN ERRORS display will count
received errors.
d. At the local modem, the indicators should be:
e. To further test the modem and communications link,
reverse the system loopback. First exit the existing loop-
back test. Reverse the roles of the local and remote
modems and repeat step two.
Fault Isolation Procedure
V.3400
D-3
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