V.92 DIALUP 2-WIRE OR 4-WIRE LEASED-LINE DATA/FAX MODEM AT COMMANDS GUIDE
40
S-Reg
Unit
Range
Default
Description
S36
decimal
0–7
7
LAPM Failure Control: Specifies the fallback action to take
in the event of an LAPM negotiation failure. These fallback
options are initiated immediately upon connection if S48 is
set to 128. If an invalid number is entered, S36 acts as if the
default value has been entered. (See S48.)
0
Modem disconnects.
1
Modem stays online and a direct mode
connection is established.
3
Modem stays on-line; normal mode connection
established.
4
MNP connection is attempted. If it fails,
modem disconnects.
5
MNP connection is attempted. If it fails, a
direct mode connection is established.
7
An MNP connection is attempted and if it fails,
a normal modem connection is established.
S38
seconds
0–254, 255
20
Delay Before Forced Hang Up: Sets the delay
between the modem’s receipt of the H
command to disconnect (or high-to-low
transition of DTR if the modem is
programmed to follow the signal) and the
disconnect operation. Applies only to error-
correction connections. This register can be
used to ensure that data in the modem buffer
is sent before the modem disconnects. If S38 is
set between 0 and 254, the modem waits for the
remote modem to acknowledge all data in the
buffer before disconnecting. If S38 is set to 255,
the modem does not time out and continues to
attempt to deliver data in the buffer until the
connection is lost or the data is delivered.
S46
decimal
136, 138
138
Data Compression Control: Enables/disables data
compression:
136
Error correction without compression.
138
Error correction with compression.
S48
decimal
0, 7, 128
7
V.42 Negotiation Control: Enables or disables LAPM
negotiation.
128
An invalid value is treated as a 128 value.
0
Disables negotiation and proceeds with LAPM.
7
Enables negotiation.
128
Disables negotiation. Proceeds at once with the
fallback action specified in S36. Can be used to
force MNP.
Summary of Contents for MD1650A-JP
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