Multi-Tech Systems MT2456SMI22 manual S36 Lapm Failure Control, S37 Desired Line Connection Speed

Chapter 4 - V.22bis Commands

S36 - LAPM Failure Control

Default: 7 (00000111b)

Bits 0-2 This value indicates what should happen upon a LAPM failure. These fallback options are initiated immediately upon connection if S48=128. If an invalid number is entered, the number is accepted into the register, but S36 will act as if the default value has been entered.

0 = Modem disconnects.

1 = Modem stays on-line and a Direct mode connection is established.

2 = Reserved.

3 = Modem stays on-line and a Normal mode connection is established.

4 = An MNP connection is attempted and if it fails, the modem disconnects.

5 = An MNP connection is attempted and if it fails, a Direct mode connection is established.

6 = Reserved.

7 = An MNP connection is attempted and if it fails, a Normal mode connection is established. (Default) Bits 3-7 Reserved

S37 - Desired Line Connection Speed

S37 specifies the desired line connection speed. Default: 0

Bits 0-3 Desired line connection speed. This is linked with the Fn command. If an invalid number is entered, the number is accepted into the register, but S37 will act as if the default value has been entered.

0 = Attempt automode connection (F0). (Default.)

1-3 = Attempt to connect at 300 bps (F1).

4 = Reserved.

5 = Attempt to connect at V.22 1200 bps (F4).

6 = Attempt to connect at V.22bis 2400 bps (F5).

7 = Attempt to connect at V.23 (F3). Bits 4-7 Reserved

S38 - Delay Before Forced Hang Up

S38 specifies the delay between the modem's receipt of the H command to disconnect (or ON-to-OFF transition of DTR if the modem is programmed to follow the signal), and the disconnect operation. Applicable to error-correction connection only. This parameter can be used to ensure that data in the modem buffer is sent before the modem disconnects.

1.If S38 is set to a value between 0 and 254, the modem will wait that number of seconds for the remote modem to acknowledge all data in the modem buffer before disconnecting. If time expires before all data is sent, the NO CARRIER result code will be issued to indicate that data has been lost. If all data is transmitted prior to time-out, the response to the H0 command will be OK.

2.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.

Range: 0-255 seconds

Default: 20

S39 - Flow Control Bit Mapped Options Status

Default: 3 (00000011b)

Bits 0-2 Status of command options. 0 = No flow control.

3= RTS/CTS (&K3). (Default)

4= XON/XOFF (&K4).

5= Transparent XON (&K5).

6= Both methods (&K6).

Bits 3-7 Reserved.

S40 - General Bit Mapped Options Status

S40 indicates the status of command options. Default: 104 (68h) (01101000b)

Bits 0-2 Reserved.

Bits 3-5 Break Handling (\Kn). 0 = \K0.

1 = \K1.

2 = \K2.

3 = \K3.

4 = \K4.

5 = \K5. (Default)

Bits 6-7 Reserved.

Multi-Tech Systems, Inc. MT2456SMI-22 SocketModem Developer’s Guide 42