Ericsson ZAT 19.2 Operation Manual page 88

[3, Command sets
&T Test Commands
Commands: &T0, &T1, &T3, &T4, &T5, &T6, &T7, &T8
If your modem is connected in LAPM/MNP mode, it is
impossible to enter these commands.
AT&TOp|
Terminates test in progress.
AT&T1 pt
Selects Local Analogue Loopback LOOP 3.
Verifies integrity of the path which includes
local modem and local DTE
LOOP 3 test is terminated with an escape
code sequence. (+++).
AT&T3p%
Selects Digital Loopback -LOOP 2. To loop
the data stream received from the remote
modem back to the remote modem
AT&TApS|
Accepts remote digital loop request
Denies remote digital loop requesl. (Remote
Loop 2)
Initiate Remote digital loop
ATETT ee}
Remote digital loop wilh selftest
AT&TB pts
Local Analogue Loopback with selftest
Verifies integrity of local modem transmit and
receive circuil. LOOP 3 with selftest is
terminated with the command &TO
If the commands &T4 or &T5 are given in online command
mode, return to data mode (ATO) will activate the new setup.
"Read more about « TESTS» in chapter 14
+T Trellis Coded Modulation
Commands : +T0, +71
AT+TO pial
Disable TCM.
AT+11 eof
Enable TCM
Applies to V.32 9600 bps operation only.
3-50
ZAT 14.
LZTR104006 R1.00
4114.4-7 and Zat 19.2/19.2-7