Lucent Technologies Host-Based Controller Modem AT AT+VRA=interval Ringback Goes Away Timer

Models: Host-Based Controller Modem AT

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Data Addendum

Host-Based Controller Modem

June 15, 1998

AT Command Set

 

AT Voice Commands Reference (continued)

AT+VRA=<interval>

Ringback Goes Away Timer

The modem uses the ringback goes away timer when originating a call.

This command sets this timer to the amount of time the modem shall wait between ringbacks before assuming that the remote station has gone off-hook.

AT+VRA?

Returns the current value.

AT+VRA=?

Returns the range of supported values.

AT+VRN=<interval>

Ringback Never Appeared Timer

The modem uses the ringback never appeared timer when originating a call.

The AT+VRN command sets this timer to the amount of time that the modem shall spend looking for an initial ringback. If ringback is not detected within this interval, the modem shall assume that the remote station has gone off-hook.

AT+VRN?

Returns the current value.

AT+VRN=?

Returns the supported values.

AT+VPR=<rate>

Select DTE/DCE Interface Rate

The AT+VPR command returns an OK for any rate but has no action.

Events Reported to the DTE :

The modem will return OK when going off-hook in voice mode (+FCLASS=8). After answering in voice mode, the modem may send any of the following <DLE> shielded event codes to the DTE, as appropriate:

<DLE> Shielded Codes Sent from DCE to DTE

Code Character

Description

0¾9, A¾D, #, *

DTMF tones

a

Answer tone

b

Busy tone

c

Fax calling tone

d

Dial tone

e

Data calling tone

h

Local phone on-hook

H

Local phone off-hook

R

Ring

s

Silence timer has expired

<ETX>

End of voice data transmission

@

CAS tone detected

<DLE> Codes Sent to DCE:

For simple actions in voice mode, the modem may send any of the following <DLE> shielded event codes (in ASCII) to the DTE, as appropriate:

<DLE> Shielded Codes Sent from DTE to DCE

Code Character

Description

u

Bump up the volume by 1 dB

d

Bump down the volume by 1 dB

<ETX>

End of voice data transmission

!

End receive data state

Version 1.0

Lucent Technologies Inc.

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Lucent Technologies Host-Based Controller Modem AT AT+VRA=interval Ringback Goes Away Timer, Events Reported to the DTE

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.