Ericsson ZAT 19.2 Operation Manual page 64

command sets
&L Switched or Leased line
Commands: &LO, &L1
AT&LO gs] "- .:..| Switched line operation
AT&L' as a i l _.-| Leased line operation.
Speed selection:
The +M command is ignored in leased line configuration. The
modem will use the speed of the last AT-command issued or the
speed selected in the SET-UP menu on the display. After a
power up, the modem will use the speed information in the start
up profile.
Channel selection (Answer/Call):
In jeased line operation the modem will use the channel selected
by register +S27, bit 7. This register may be modified with the
+&L command. It may however be more convenient to use the
SET-UP menu on the display to select the channel.
Connection:
The modems may be started on a leased line with the A and D
commands. In most applications it is easier to configure and
control the modem from the front switches and the display. The
modem is either configured to "ALWAYS ON" or "108.1
CONTROL!' in leased line. In the "ALWAYS ON" mode the
modem will start a handshake immediately after the power up
sequence has finished. If the modem is disconnected it will start
a new connection after 60 seconds.
Modem handshake:
When the modem starts handshaking, it will transmit data carrier
in the selected speed and wait for a received carrier from the
remote modem. When received carrier is detected, the modem
initiates a retrain sequence to synchronise the modems. The
CONNECT message is sent to DTE and the DCD (109) signal is
set to the ON state.
Disconnect:
If received data carrier is lost the modem will enter the
handshake mode and try to establish a new connection. The
modem can be forced from data mode to command mode by
issuing the escape sequence (+++) and disconnect from line
with H command. Disconnect controlled by the DTR (108.2)
signal can be used if the modem has been configured with the
&D or +E1 commands. The ROLL/EXEC switch can always be
used to disconnect.
3-26 LZTR104006 R1.00
Zat 14.4/14.4-7 and Zat 19.2/19.2-7