Paradyne KeepInTouch 3766 User Manual page 55

AT Command Set and S-Registers
Table 4-1. AT Command Reference (14 of 18)
AT
Command Description
&T n &T3
(continued)
&T4
&T5
&T6
&T7
&T8
Local Digital Loopback test. This test causes your
modem to return any data it receives back to the
remote modem. The remote modem monitors the
returned data for errors. Both modems must be
connected in Direct mode (\N1) or Normal mode
(\N0). The remote modem must have &T4 set.
Allows Remote Digital Loopback (RDL) test. This
setting allows the modem to perform a remote digital
loopback test, if so requested by the remote modem.
See &T6 for more information on remote digital
loopback testing.
Rejects Remote Digital Loopback (RDL) test
requests. This command causes the modem to
reject a remote modem's request for a remote digital
loopback test. See &T6 for more information on
remote digital loopback testing.
Remote Digital Loopback test. This test verifies the
integrity of the local modem, telephone line, and
remote modem. Data entered at the local computer
is sent to the remote modem, which returns it to the
sending modem. The modems must be connected in
Direct mode (\N1) or Normal mode (\N0), and must
not be using V.21 or Bell 103J modulations. The
remote modem must have &T4 set.
Remote Digital Loopback test with pattern. This test
is similar to &T6, but uses a standard test pattern for
the data.
Local Analog Loopback test with pattern. This is
similar to &T1, but uses a standard test pattern for
the data.
Issue 2 May 1995
4-15