Host-Based Modem

Data Addendum

AT Command Set

June 15,

1998

 

 

 

Test and Debug AT Commands

The following commands are to be used for testing and debugging only and are not meant for general use.

&&C

Write to / Read from DSP Register

AT&&C<loc>,<val> writes the value <val> to DSP register at location <loc>.

AT&&C<loc> reads from location <loc>.

&&L

Line-to-Line Loopback

This command provides a loopback for line-to-line.

&&R

Write to/Read from DSP RAM Location

AT&&R<loc>,<val> writes the value <val> to DSP RAM location <loc>.

AT&&R<loc> reads from location <loc>.

&&SSpeaker Codec Loopback

This command provides a loopback from the microphone to the speaker.

%T94

Test External RAM

This command “AT%T94” is used for testing the external RAM. If the external RAM is good, this command returns “PASS”. If the external ram is not good, this command returns “FAIL”.

Example :

 

AT%T94

 

PASS

- external ram is good

%T125, %T124

Test DSP 56K Version in External Ram

The command “AT%T125” is used for testing the DSP56K code version and checksum running in external ram. After issuing “AT%T125” the user may then issue “ATI4” to get DSP Version or “ATI1” to get the DSP checksum. (The command “AT%T125” is not valid foramless version of the DSP 56K code.)

The command “AT%124” is for internal ram version.

#UD

Unimodem Diagnostics

The reference for the #UD command is Microsoft’s Draft Reference Specification rev.0.85. The Lucent Technologies modem implements a subset of the parameters in that document.

#UD is an action command. It does not take parameters. It shall be the last command in the command line. The modem logs aspects of its operation for each call, and saves these results (in volatile memory) until cleared by one of the following events:

1.Power off (or D1 or D3 state entered)

2.Hard reset (e.g. negate DTR with &D3 set, reset button)

3.Soft reset = ATZ or AT&F

4.ATD command issued

5.ATA command issued

6.Automatic answer (e.g. set register S0>0 and ring detected)

These results are NOT cleared by changing DTR, V.24 circuit 108.2, if &D0, &D1 or &D2.

In response to this command, the modem reports one or more lines of information text as defined below. Information text format is defined in ITU V.25ter: each line is preceded by a <CR><LF> pair, and terminated by <CR><LF>. (Note: as per V.25ter, CR and LF characters may be changed by writing new values to the contents of registers S2 and S3 respectively.)

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Version 1.0

Lucent Technologies Inc.

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Lucent Technologies Host-Based Controller Modem AT specifications Test and Debug AT Commands
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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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