n = 0 Otherwise

Host-Based Controller Modem

Data Addendum

AT Command Set

June 15, 1998

 

 

AT Command Reference (continued)

 

&Dn DTR Control

 

This command interprets how the modem responds to the state of the DTR signal and changes to the DTR signal. &D0: Ignore. The modem ignores the true status of DTR and treats it as always on. This should only

be

 

 

 

used if your computer does not provide DTR to the modem.

&D1:

If the DTR signal is not detected while in on-line data mode, the modem enters command mode,

 

issues OK result code, and remains connected.

&D2:

If the DTR signal is not detected while in on-line data mode, the modem disconnects (default).

&D3:

Reset modem on the on-to-off DTR transition.

Result Codes:

 

 

OK

 

n = 0, 1, 2, 3

ERROR

Otherwise

&Fn Load Factory Settings

This command loads the configuration stored and programmed at the factory. This operation replaces all of the command options and the S-register settings in the active configuration with factory default values.

Note: In voice mode (AT+FCLASS=8), if the AT&F command is placed on the same line as other commands, the command line is ignored. To load factory settings in voice mode, issue AT&F by itself.

Result Codes:

OK ERROR

&Gn V.22bis Guard Tone Control

This command determines which guard tone, if any, to transmit while transmitting in the high band (answer mode). This command is only used in V.22 and V.22bis mode. This option is not used in North America and is for

international use only.

 

 

&G0: Guard tone disabled (default).

 

&G1: Sets guard tone to 550 Hz.

 

&G2: Sets guard tone to 1800 Hz.

Result Codes:

 

 

OK

n = 0, 1, 2

 

ERROR

Otherwise

&Jn

Auxiliary Relay option

 

&J0:

The auxiliary relay is never closed. (Default)

 

&J1:

NOT SUPPORTED

Result Codes:

 

 

OK

n = 0

 

ERROR

Otherwise

14

Lucent Technologies Inc.

Version 1.0

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Lucent Technologies Host-Based Controller Modem AT Dn DTR Control, Fn Load Factory Settings, Gn V.22bis Guard Tone Control

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.