Remote Digital Loopback-S16=8 - US Robotics COURIER User Manual

COURIER HIGH SPEED MODEMS
Ending Testing with the Test Pattern
Pressing any character key cancels all test pattern tests and
hangs up the modem. If you used Register S16, be sure to reset
Register S16 to Data mode when you reset the modem to its
error control defaults, for example, ATZ or AT&M4S16=0.
REMOTE DIGITAL LOOPBACK-S16=8
Responding Modem
The responding modem must be ready to act on the Courier's
RDL request. USRobotics high speed modems should be set to
&T4. If they do not have &T testing capability, they should be
set to S16=8.
Initiating Modem
1.
If DIP switch 9 is OFF, set it ON so that it does not hang up
on receipt of the +++ escape code. Issue an ATZ command
to initiate the new switch setting.
2. Set the software to 2400 or 1200 bps. The CCITT-specified
-
-
-
-
-
-
-
-
RDL signals are defined only for connections at 2400 or 1200 -
bps.
3. Disable error control by setting the modem to &MO. Then
establish a connection with the remote modem.
4. Bring the modem back to Command mode by sending
it
the
escape code: one second of no data, three pluses(+++), and
another second of no data.
5. When the OK result code appears, send the modem the
following command.
ATS16=8 0
The modem enters RDL mode (S16=8), the MR status light
flashes, and the modem goes back online
(0
command).
Then it transmits the CCITT-defined RDL signals, causing
the remote modem to enter RDL mode.
6. Type any data at the keyboard. (Or send the test pattern.)
7. To end the test, send the modem the+++ escape code again
to bring it back to Command mode.
F-10 Modem Testing
-
-
-
-
-
-
-
-