Host-Based Controller Modem

Data Addendum

AT Command Set

June 15, 1998

 

 

AT Voice Commands Reference (continued)

 

Example # 1: Initiating a speakerphone call (with phone muting during conversation)

The speakerphone application is loaded. The modem is initially idle, in data mode. The user then decides to pick up the phone to place a speakerphone call. Picking up the phone should initiate the following chain of events.

Command

Description

AT+FCLASS=8

The modem enters voice mode.

OK

DCE responds. Now in voice mode.

AT+VGT=128

Set speaker volume to normal level.

OK

DCE responds. Volume level is set.

AT+VLS=7

Attach internal speaker and microphone, DCE off-hook.

OK

DCE responds. Now in speakerphone mode. Phone off hook, dial tone audible,

 

speaker and microphone ready to use.

ATD5551234

Provide dial string for DCE to place the call.

OK

DCE responds. Number is dialed.

Call is placed through phone network. Caller can hear ringback or busy signal from the phone being called. If the person at the other end picks up the phone, caller and callee converse. If the speakerphone user decides to mute his speakerphone, the application sends the following to mute the speakerphone.

Command

Description

AT+VLS=5

Enter Mute Mode. Mic is disconnected from the line, leaving the speaker only.

OK

DCE responds. The mic is no longer connected to the line, and the

 

speakerphone is mute.

After a while, the speakerphone user decides to turn the mic back on (mute off). This is done when the application issues the following command.

Command

Description

AT+VLS=7

No Mute. Microphone is reattached to system along with speaker.

OK

DCE responds. Speakerphone with both mic and speaker is operational.

Conversation ends, and user hangs up.

Command

Description

ATH

Application tells the modem to terminate the call with standard AT command.

OK

DCE responds.

Speakerphone is now on-hook. The speaker and mic have been detached from the system, and the modem is now in 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 specifications AT+VLS=7, AT+VLS=5, Ath

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.