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Jaton V.90 user manual AT Commands, Overview

Models: V.90

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CHAPTER 5 AT COMMANDS

Overview

The modem (DCE) operates in two states: command or online. In each mode, both data and commands (including DCE responses) are transferred through the UART THR (Transmit Hold register) and the RBR (Receiver Buffer register).

The modem defaults to the command state. In this command state, the host (DTE) communicates to the modem through AT commands and S-registers. S-registers contain modem status and configuration information that DTE can access. AT commands are character strings that guide modem operation. Many of AT commands indirectly affect the contents of S- registers.

∙An AT command string begins with an AT prefix and ends with a carriage return character defined in S-Register 3 (default: <↵ Enter>). The A/ (repeat last command) and +++ Escape sequences are the only exceptions.

∙AT command strings can contain multiple commands in the same string. These commands are placed after the AT prefix and before the <↵ Enter>. Spaces may be used to separate commands within the string.

∙Each command line may include up to 80 characters and spaces.

∙The AT prefix and commands may be in either upper or lower case, but all characters for the given command must use the same case.

∙For commands that contain numeric options you may omit the numeric value and the modem will assume that the number 0 was entered.

∙While the modem is attempting to connect to a remote modem, any character entered is considered an ABORT command. The modem will go on-hook and enter the command mode.

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Jaton V.90 user manual AT Commands, Overview
Page 43 Page 45

V.90 specifications

The Jaton V.90 modem is a classic example of 56K technology that revolutionized dial-up internet connections in the late 1990s. As one of the early models supporting the V.90 standard, this modem enabled users to experience faster internet speeds compared to its predecessors. The V.90 protocol allowed for a maximum download speed of 56 Kbps, offering significant improvements over the previous V.34 modem, which capped out at 33.6 Kbps.

One of the standout features of the Jaton V.90 is its ability to adapt to different line conditions, ensuring optimal performance regardless of the quality of the telephone line. The V.90 standard provided a retransmission mechanism that allowed data to be resent if errors occurred during transmission, improving reliability and reducing the likelihood of dropped connections.

The modem incorporates technologies such as error correction and data compression. With built-in error correction protocols like V.42 and MNP, the Jaton V.90 can detect and correct common transmission errors, which is vital in maintaining a stable connection. The data compression technology, which uses MNP Class 5, enhances throughput by compressing data before transmission. As a result, users could effectively increase their upload speeds and minimize latency, creating a more seamless browsing experience.

The hardware features of the Jaton V.90 modem typically include a standard RJ-11 telephone connector, which makes it easy to connect to existing phone lines. The modem may come with both internal and external configurations, allowing flexibility depending on user preferences and system requirements. The external version often features indicator LEDs that provide real-time feedback on connection status, data transfer activity, and power status.

Compatibility is another crucial aspect of the Jaton V.90 modem. Operating with a variety of systems, it was designed to work with Windows, Mac OS, and other operating environments, making it accessible for a wide range of users. Additionally, the modem generally supports various software applications for easy configuration and management.

Ultimately, the Jaton V.90 modem played a pivotal role in facilitating internet access during a transformative period, laying the groundwork for future high-speed connections. While modern broadband solutions have since eclipsed dial-up speeds, the legacy of the Jaton V.90 as a reliable and innovative piece of technology remains significant in the history of internet connectivity.