Host-Based Controller Modem

Data Addendum

AT Command Set

June 15, 1998

 

 

AT Voice Commands Reference (continued)

 

Example # 3: Answering a speakerphone call

The speakerphone application is loaded. The modem is initially idle, in data mode. In this mode, the modem is always screening for incoming calls.

Command

Description

RING

DCE reports ringing from remote station. The user decides to pick-up the

 

phone, which should initiate the following:

AT+FCLASS=8

Modem enters voice mode.

OK

DCE responds. Now in voice mode.

AT+VGT=128

Speaker volume set to normal.

OK

DCE responds. Volume level is set.

AT+VLS=7

Call is answered: Attach internal speaker and microphone to the line, DCE

 

off-hook.

OK

DCE responds. Now in speakerphone mode, connected to the line

 

(call is answered).

Speakerphone user picks up the phone and hears the caller from the other end. Conversation continues for awhile. When it ends, the speakerphone user hangs up.

Command

Description

ATH

DTE issues standard command to terminate call.

OK

DCE responds. Speakerphone goes on-hook. Speaker and microphone are

 

detached from system, and modem returns to data mode (+FCLASS=0).

Note 1: When the local phone goes off-hook in the middle of a speakerphone call, the speakerphone disconnects, and the DCE returns <DLE>-H to the DTE.

Note 2: When the speakerphone is on, call waiting (hold operation) is initiated by:

Command

Description

ATD!

DTE sends hold command to DCE.

OK

DCE responds.

Example # 4: Receiving an incoming FAX call in speakerphone or TAD mode and switching to FAX mode

In this example, the sequence begins at the point of the user or telephone answering device (TAD) taking the speakerphone off-hook and detecting a FAX calling tone from the other end.

Command

Description

<DLE>-c

DCE detects FAX calling tone from the remote FAX and informs the application

 

by sending DLE-c sequence.

AT+FCLASS=1

Application switches modem out of voice mode, and into FAX mode.

OK

DCE responds. Now in FAX mode, still off-hook and connected to incoming call.

ATA

Application instructs modem to answer FAX call using standard AT commands.

OK

DCE responds. The call is answered, and modem continues with procedures to

 

establish connection and receive FAX transmission. The application software

 

will then take care of disconnecting the call when the FAX is done, and returns to

 

data mode (+FCLASS=0).

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Lucent Technologies Inc.

Version 1.0

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Lucent Technologies Host-Based Controller Modem AT Example # 3 Answering a speakerphone call, Ring, AT+FCLASS=1, Ata
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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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