Fax Class 1 AT Commands

The fax AT+FCLASS command is used for changing between fax classes, determining the current class selection, and determining the supported fax classes. Both data/fax Class 0 (data modem mode) and Class 1 (fax modem mode) are implemented by the modem. In Class 0, the DTE-to- modem data rate can be set from 300 bps to 115,200 bps. In Class 1, it is recommended that the DTE-to-modem data rate is set to 19,200 bps.

The silence-time timers consist of AT+FTS=<TIME> and AT+FRS=<TIME>. Silence time is defined as the length of time when the modem neither receives nor transmits energy (that is, modem transmit carrier) on the telephone line.

The modem exchanges streams of data with the DTE while executing the data transfer commands AT+FTM=<mod>, AT+FTH=<mod>, AT+FRM=<mod>, and AT+FRH=<mod>. The values supported for <mod> are provided in Table 23.

During data transfer, an ASCII <DLE> character ($10h) is used as a special character to shield other special characters.

Special characters in the data stream are used in the following way:

any data

... <DLE><ETX>

end of data stream

any data

... <DLE><DLE>

single 10h<DLE> in data stream

any data

... <DLE>

 

<not DLE

or ETX>

delete both <DLE> and next character

When the DTE transfers data to the modem, the DTE must insert a <DLE> for each <DLE> in the original data stream. In addition, when data is no longer available, the DTE must add the stream terminator <DLE><ETX> to the end of the data stream. The modem buffers up to one thousand bytes of fax data before sending it to the remote modem (AT+FTM command). If the modem detects the two terminating characters <DLE><ETX> within the data stream, it transmits the data immediately to the remote modem without waiting for the buffer to fill up.

Table 23. <mod> Selection Table

Value

Modulation

Speed (bps)

 

 

 

3

V.21 ch 2

300

 

 

 

24

V.27 ter

2400

 

 

 

48

V.27 ter

4800

 

 

 

72

V.29

7200

 

 

 

73

V.17

7200

 

 

 

74

V.17 with short train

7200

 

 

 

96

V.29

9600

 

 

 

97

V.17

9600

 

 

 

98

V.17 with short train

9600

 

 

 

121

V.17

12,000

 

 

 

122

V.17 with short train

12,000

 

 

 

145

V.17

14,400

 

 

 

146

V.17 with short train

14,400

 

 

 

536EX Chipset Developer’s Manual

65

Intel Confidential

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Intel 537EX manual Mod Selection Table, Value Modulation Speed bps
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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.
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