IS-101 Voice Mode AT Commands

6.1DTMF Detection Reporting

DTMF detection information is reported by the modem to the DTE by a <DLE> shielded command as outlined in Section 6.5 of the ITU V.253 specification. When the DTMF burst is detected in Voice mode, the modem sends to the DTE a <DLE></> followed by a sequence of <DLE><-> is inserted to indicate the end of the determination interval.

For example, a single 280ms burst of DTMF 5 would report:

<DLE></><DLE><5><DLE><5><DLE><5><DLE><5><DLE><->

6.2Relay Control

To originate a call (that is, to originate call forwarding or auto-dialing) and to generate tones, use the dialing command:

ATDT <telephone number>

If the modem was not already off-hook, then this command automatically configures the value for AT+VLS=m to m = 1 or m = 5 depending on the value for Mn.

To answer a call, use the AT+VLS=m command. Unlike data mode, the modem (when configured for voice mode) does not automatically answer an incoming call (that is, the modem ignores the contents of S-register S0).

Remote playback/record takes place whenever the modem is off-hook (OHREL* is activated). For local playback/record, the modem is on-hook, and the user uses a local telephone or handset. The LPHREL* relay driver may be used to control the local telephone or handset when implementing local playback/record mode (AT+VLS=m). Additionally, voice messages may be played through the modem/computer speaker. The 536EX chipsets also provide a microphone interface that can be used for local recording.

In voice mode, all voice AT commands can be issued by the DTE at any valid speed between 300 bps to 115,200 bps. Typically, the DTE-to-modem data rate is set for 19,200 bps, which is the recommended data rate for Class 1 fax mode. The DTE-to-modem data rate may need to be set to 115,200 bps in certain instances, such as during playback or during record mode for a CL1 compression scheme.

The following data and fax AT commands are supported in voice mode:

Data: All except ATA, ATIn

Fax: +FCLASS

Table 25. Voice Mode Command Descriptions

Command

Default

 

Description

 

 

 

 

 

Voice Mode Selection: This command enables or disables voice mode. All voice mode commands

+FCLASS

 

(except for +FCLASS=m) are valid only in voice mode.

0

0*

Data mode

=8

 

1

Class 1 fax mode

 

 

 

 

8

Voice mode enabled

 

 

 

 

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

536EX Chipset Developer’s Manual

71

Intel Confidential

Page 70 Page 72
Page 71
Image 71
Intel 537EX manual Dtmf Detection Reporting, Relay Control, Voice Mode Command Descriptions
Page 70 Page 72

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