Error Correction and Data Compression

Table 21. V.44/V.42/V.42 bis and MNP Data Modem Command Descriptions (Continued)

Command

Default

 

Description

 

 

 

 

 

Set break control: Defines what action the modem takes when a break (attention signal) is sent or

 

 

received, as described below:

 

 

where n =,

 

 

 

In connect state, transmits break to remote (if in reliable mode):

 

 

0, 2, 4

Enters command mode, no break sent

 

 

1

Destructive/expedited

 

 

3

Nondestructive/expedited

\Kn

5

5

Nondestructive/nonexpedited

In command state, transmits break to remote (if in reliable mode):

 

 

 

 

0, 1

Destructive/expedited

 

 

2, 3

Nondestructive/expedited

 

 

4, 5

Nondestructive/nonexpedited

 

 

In connect state, receives break at modem port and sends to serial port:

 

 

0, 1

Destructive/expedited

 

 

2, 3

Nondestructive/expedited

 

 

4, 5

Nondestructive/nonexpedited

 

 

 

 

 

Set Inactivity Timer: During a buffer (normal) or reliable connection, if no data is sent or received within

\Tn

0

the inactivity time period, the link is disconnected. The default, ‘0’, disables this feature.

Range: 0–90 Length in minutes

 

 

 

 

n = 0*

Disables inactivity timer

 

 

 

 

 

Set XON/XOFF Pass-Through:If software flow control is enabled (\Q1), this command defines whether

 

 

the XON (11h) and XOFF (13h) characters received from the DTE are sent to the remote modem. In

 

 

addition, if the modem port flow control is enabled (\G1) in normal mode, the command specifies whether

 

 

the XON and XOFF characters received from the remote modem are sent to the DTE. In both cases, flow

\Xn

0

control operation is not affected.

Range: 0, 1

 

 

 

 

 

 

n = 0*

Processes flow control characters*

 

 

n = 1

Processes flow control characters and passes them through to the local or remote so they

 

 

 

can process the characters.

 

 

 

 

 

Set V.42 Detect Phase: In V.42 modes (+ES=3,0,2 and +ES=3,2,4), this command specifies whether the

 

 

modem detects V.42, MNP, or no error-correcting protocols from the remote modem and changes to the

-Jn

1

appropriate mode. Otherwise, only V.42 is attempted.

Range: 0, 1

 

 

 

 

 

 

n = 0

Disables the V.42 detect phase

 

 

n = 1*

Enables the V.42 detect phase

 

 

 

 

 

V.42 bis Compression Control: This command specifies whether the data in the LAPM frames are

 

 

compressed using V.42 bis data compression. This can improve throughput by as much as 400%.

 

 

Compression can be negotiated to operate in one direction or both.

“Hn

3

Range: 0–3

 

n = 0

Disables V.42 bis

 

 

 

 

n = 1

Enables V.42 bis only when transmitting data

 

 

n = 2

Enables V.42 bis only when receiving data

 

 

n = 3*

Enables V.42 bis for both transmitting and receiving data

 

 

 

 

 

V.42 bis String Length: This command specifies the maximum number of characters that can be

“On

32

compressed into one V.42 bis code word. The default value of 32 optimizes throughput for most file types.

Range: 6–250 Number of characters

 

 

 

 

n = 32*

Usual number of characters

 

 

 

 

NOTE: An asterisk (*) denotes the factory-default setting.

536EX Chipset Developer’s Manual

59

Intel Confidential

Page 59
Image 59
Intel 537EX manual Kn

537EX specifications

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