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jommand Sets,
The commonly used mode is \NO for non protocol applications.
This is the default asynchronous mode on the modem.
If this configuration is selected, the modem will not use internal
data buffering. Data is transmitted as in a dumb modem. This
gives the possibility to change the data format after a connection
without any use of commands.
The modem has no active control on the transmitted data
causing the password dialback function to be disabled in this
mode. The commands +P01 and +PO2 gives the error
message ILLEGAL CONFIGURATION: PASSWORD as long
as \N1 command is active. The \N1 command will also give error
message if +PO1 or +PO2 is active.
e No protocol support
e No data buffering.
e Data is sent directly to the modem hardware for transmission
on the line.
e Error correction disabled.
e Split speed will be ignored.
e Flow control is ignored.
Fixed reliable mode:
AT\N2¢#|)
Fixed protocol mode will connect in LAPM
ee
3.
| lowards modems with V.42 support, and MNP.
"3,
, |f a non protocol modem tries to connect the
" - } connection will be disconnected after the
protocol handshake attempls.
A
:
-
|
| Fixed MNP mode
As fixed
protocol mode
ATING ga
=| but will nolaccept LAPM requests
Aral)
©
| Fixed LAPM mode. As fixed
protocol mode
ATIN7 "|
-4
but will nol accept MNP requesis
Any connections without protocol will cause a disconnect. The
difference between the modes is only which protocols that are
allowed (LAPM and MNP, MNP only or LAPM only). All
flowcontrol and buffering are as in normal mode.
After the handshake has finished, but prior to the CONNECT
message, the modem tries to initiate the reliable link. During the
link negotiation the modems agree on which reliable class to
use. If the negotiation succeeds, the modem issues the
CONNECT message and data transfer can proceed.
3-32
LZTR104006 R1.00
Zat 14.4/14.4-7 and Zat 19.2/19.2-7
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