Local Digital Loopback - Epson ESC/VP21 User Manual

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4.5 Local Digital Loopback

Local digital loopback checks the integrity of the remote modem and the phone line
if the remote user suspects either to be the cause of transmission errors.
During this test the modem loops data internally sent from the remote modem back
to the remote modem as shown in Figure 4-5, During the test, data is not received
by the local personal computer. Local digital loopback is useful when a remote modem is
unable to request a remote digital loopback.
60
+++
(return the modem to the on-line com-
mand state)
OK
AT\N1 <CR>
ATS18=60&T3<CR>
cursor shifts down one line
(test starts)
000
(timer expires and no errors were found)
OK
TESTING - 4