Testing The Business Modem Using S-Resister 16; Analog Loopback (Al) S16=1D - 3Com 56K Command Reference Manual

Testing the Business
Modem using
S-Resister 16
Analog Loopback (AL)
S16=1D
Register S16 is a bit-mapped register (See Appendix A, S-Registers, for
instructions for setting bit-mapped registers).
For your modem to use
Remote digital loopback with built-in test pattern
Remote digital loopback using keyboard data
Earlier modems require bit 3 to be enabled to grant digital loopback
testing to a remote device. The Business Modem requires the &T4 setting
instead. To perform remote digital loopback testing with a modem that
does not use the &T test command, that modem should be set to S16=8.
To use the modem's Test Pattern (S16, bit 2) instead of typing your own
data, see RDL Testing Using a Built-in Test Pattern (S16=4).
1 Send
AT&M0&N3S14.0=0
This command disables error control, fixes the connection rate at 2400
bps, and makes the Business Modem return to command mode when
you type .
+++
2 Send . The modem enters AL mode and sends a CONNECT
ATS16=1D
result code. The MR status light flashes.
3 Type data to the modem for it to transmit, loop to its receiver, and output
to the screen.
An alternative is to use the Test Pattern, described later.
4 Send the escape code,
5 Send , unless you used a reset command (ATZ or ATZ!).
AT&M4

Testing the Business Modem using S-Resister 16

to the modem to prepare for testing.
, and then to end the test.
+++ ATH
Use one of these command
ATS16=4 or ATS16.2=1
ATS16=8 or ATS16.3=1
14-9