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 58 Page 60
Page 59
Image 59
Intel 537EX manual Kn
Page 58 Page 60

537EX specifications

The Intel 537EX is a powerful and innovative embedded processor designed for a range of applications, particularly in the fields of industrial automation, telecommunications, and transport management systems. This processor is a member of Intel's embedded product line, tailored specifically to meet the demands of systems that require high reliability and long lifecycle support.

One of the main features of the Intel 537EX is its multi-core architecture, which enables efficient parallel processing capabilities. This allows for the execution of multiple tasks simultaneously, significantly improving overall system performance. The processor also incorporates Intel’s advanced power management technology, which ensures that the device consumes energy efficiently, enhances thermal performance, and prolongs the lifespan of the system.

The Intel 537EX supports a range of connectivity options, including high-speed Ethernet and Serial ATA interfaces. This ensures that it can easily integrate into existing systems, seamlessly supporting applications that require robust data transfer capabilities. Additionally, the processor is equipped with multiple I/O ports, facilitating the connection of various peripherals and sensors, which is crucial in industrial applications.

One of the standout technologies within the Intel 537EX is its support for hardware virtualization. This feature allows for the creation of multiple virtual environments within a single physical structure, optimizing resource utilization and enhancing system flexibility. Additionally, Intel’s integrated security technologies provide a significant layer of protection against potential threats, ensuring that embedded systems remain secure.

Another characteristic of the Intel 537EX is its extensive software support, which includes compatibility with various operating systems and development environments. This versatility makes it an attractive choice for developers looking to build or upgrade their embedded systems. With access to Intel's comprehensive software tools, developers can quickly optimize applications to take full advantage of the processor's capabilities.

The Intel 537EX also boasts excellent thermal performance, allowing it to operate efficiently in harsh environments. This is crucial for embedded applications in industrial settings where temperature fluctuations are common. Overall, the Intel 537EX is engineered to deliver high-performance processing power, superior connectivity, and enhanced security, solidifying its position as a reliable choice for demanding embedded applications.
Top Page Image Contents