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Lucent Technologies Host-Based Controller Modem AT S21 24/General Bit Mapped Options Status, S28

Models: Host-Based Controller Modem AT

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V.34 Modulation Enable/Disable

Host-Based Controller Modem

Data Addendum

AT Command Set

June 15, 1998

 

 

AT Commands Reference S-Registers (continued)

 

S21

V.24/General Bit Mapped Options Status

 

Indicates the status of command options. Only bits 3, 4 and 5 are used, read-only.

 

 

Bits 3-4

DTR behavior (&Dn)

 

 

0

= &D0 selected

 

 

1

= &D1 selected

 

 

2

= &D2 selected (Default)

 

 

3

= &D3 selected

 

 

Bit 5

DCD behavior (&Cn)

 

 

0

= &C0 selected

 

 

1

= &C1 selected (Default)

 

 

Default:

48 (00110000b)

 

S22

Results Bit Mapped Options Status

 

Indicates the status of command options. Only bits 4, 5 and 6 are used, read only.

 

 

Bits 4-6

result codes (Xn)

 

 

0

= X0 selected

 

 

4

= X1 selected

 

 

5

= X2 selected

 

 

6

= X3 selected

 

 

7

= X4 selected (Default)

 

 

Bit 7

Pulse dial make/break ratio (&Pn)

 

 

0

= 33/67 make/break ratio (&P1, &P2) (Default)

 

 

1

= 39/61 make/break ratio (&P0)

 

 

Default:

112 (01110000b)

 

S24

Timer to Control Sleep Mode

 

This command displays the number of seconds of inactivity (no characters sent from the DTE, no RING) in the off-line command state before the modem places itself into standby mode. A value of zero prevents standby mode. S24 is an alias for S89.

Note: If a number between 1 and 4 is entered for this register, it will set the value to 5, and the inactivity before standby will be 5 seconds. This is done for compatibility with previous products which allowed time-outs down to 1 s.

Range:

Default:

S28

This register enables/disables V.34 modulation. 0 = disabled, 1 = enabled

Range:

0 —1

Default:

1

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Lucent Technologies Host-Based Controller Modem AT specifications S21 24/General Bit Mapped Options Status, S28
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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.