Data Addendum

Host-Based Controller Modem

June 15, 1998

AT Command Set

 

 

AT Voice Commands Reference (continued)

 

Example # 8: Call screening & recording a message with TAD—using the wave driver to transmit and receive voice samples

The TAD application is loaded. The modem is initially idle, in data mode (+FCLASS=0).

Command

Description

RING

DCE reports ringing from remote station.

AT+FCLASS=8

The modem enters voice mode.

OK

DCE responds.

AT+VGT=128

Set speaker volume to normal.

OK

DCE responds.

AT+VSD=128,0

DTE selects normal silence detection sensitivity, and a silence detection interval

 

of 0 seconds. Disable silence detection.

OK

DCE responds.

AT+VSM=129,8000

DTE selects 16-bit linear voice compression with 8.0 kHz sampling rate.

OK

DCE responds.

<DLE>-R

DCE detects another ring, and notifies DTE.

AT+VLS=1

The modem answers call.

OK

DCE is off-hook

The TAD next plays its greeting message, issues a beep, and records the caller's message.

The Application may transmit voice samples using the wave driver. The application may issue WAVE_OUT_OPEN and WAVE_OUT_WRITE messages to the wave driver.

At the end of the greeting message the application may issue the WAVE_OUT_STOP message to the wave driver.

AT+VTS=[933,0,120]

DTE annotates greeting message with a 1.2 second beep.

OK

DCE responds.

The Application may receive voice samples using the wave driver. The application may issue WAVE_IN_OPEN and WAVE_IN_START messages to the wave driver.

AT+VSD=128,50

DTE selects normal silence detection sensitivity and a silence detection interval

of

5 seconds. Enable silence detection.

 

OK

DCE responds.

AT+VLS=5

Speaker is attached to system, and modem is off-hook.

OK

DCE is off-hook

The caller leaves a message, and hangs up. The modem detects silence for a specified period of time, and then notifies the DTE.

<DLE>-s

DCE issues presumed end of message after silence detection interval has

 

elapsed.

At the end of the message the application may issue the WAVE_IN_STOP message to the wave driver.

ATH

DTE issues standard command to terminate call. DCE goes on-hook,

 

speaker and microphone are detached from system, and modem returns to

 

data mode (+FCLASS=0).

OK

DCE response.

Version 1.0

Lucent Technologies Inc.

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Lucent Technologies Host-Based Controller Modem AT specifications Modem answers call
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Host-Based Controller Modem AT specifications

Lucent Technologies Host-Based Controller Modem AT represents a significant advancement in modem technology, particularly in the realm of telecommunications and data transmission. This modem, renowned for its efficiency and versatility, is characterized by a host-based architecture, which differentiates it from traditional modems that rely heavily on dedicated hardware.

One of the main features of the Lucent Technologies Host-Based Controller Modem AT is its ability to leverage the processing power of the host computer. By utilizing the host's CPU for data encoding and decoding tasks, the modem can reduce the need for specialized hardware components, allowing for a more cost-effective solution. This design not only facilitates lower manufacturing costs but also enhances the overall performance due to the utilization of the host's computational capabilities.

Another notable characteristic is its compliance with the AT command set, which standardizes communications between the modem and the host system. This ensures compatibility with a wide range of software applications and operating systems. The AT command set allows users to control modem functions easily, making it simpler to configure settings, initiate connections, and manage data transfer processes.

The modem also supports various communication protocols, such as V.90 and V.92, enabling high-speed data transmission over traditional telephone lines. With download speeds of up to 56 Kbps and upload speeds of up to 48 Kbps, the Lucent Technologies Host-Based Controller Modem AT is particularly suitable for Internet browsing, email, and other online activities demanding robust data throughput.

Additionally, the modem features built-in error correction and data compression protocols, such as V.42 and V.44, further enhancing the quality and speed of data transmission. These protocols help minimize the impact of line noise and ensure efficient use of bandwidth, leading to improved connection stability and data integrity.

In terms of connectivity, the Lucent Technologies Host-Based Controller Modem AT typically interfaces via a standard serial or USB port, making it compatible with most modern computers. Its compact design and ease of installation make it an appealing choice for both personal and professional use.

Overall, the Lucent Technologies Host-Based Controller Modem AT showcases significant innovation in modem technology, offering users a reliable and efficient solution for high-speed data communications. Its host-based architecture, adherence to the AT command set, and support for advanced communication protocols position it as a vital tool in the ever-evolving landscape of digital connectivity.
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