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Remote Digital Loopback &T6
The initiating modem signals the remote modem to go to Digital Loop-
back. The remote modem receives and then retransmits data back to the
local modem. If Digital Bilateral Loopback is enabled on the remote
modem, the remote DTE is looped back to itself (Figure Table 7-4).
Figure 7-4 Remote Digital Loopback with
Digital Bilateral Loop Enabled at the Remote Site
After making the data connection, enter the escape sequence to return to
command mode. Entering &T6 places the remote modem in digital
loopback provided the remote operator enters the &T4 command to
allow an RL request. Enter a test message and verify the message is
being looped back to your terminal screen. If the message is incorrect,
use the analog loopback tests on both modems to isolate the problem. If
both modems run analog loopback without errors, the problem could be
with the phone line.
Remote Digital Loopback with Self Test &T7
After making the data connection, enter the escape sequence to return to
command mode. Entering &T7 places the remote modem in digital
loopback provided the remote operator enters &T4 to allow an RL
request. Once in RDL/TP, the local modem transmits a test pattern and
V.3400
Test Mode Operation
7-7
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