Z1

Soft reset and reload active profile from stored profile 1.

&Cn

DCD (Data Carrier Detect) option (Default=1)

&C0

Ignore remote modem status; DCD allways on

&C1

DCD set according to remote modem status

 

 

Command

Description

&Dn

DTR(Data Terminal Ready) option, (Default=2)

&D0

In async mode, modem ignores the status of DTR .

&D1

Modem switches from data mode to command mode when an

 

on-to-off transition of DTR occurs.

&D2

If the DTR signal goes off, then the modem disconnects and

 

disables auto-answer mode. Auto-answer is enabled when the

 

DTR signal is on.

&D3

Turning off DTR re-initializes the modem and resets values

 

except UART registers

&Fn

Restore Factory Default Configuration

&Gn

Guard tone option (1200 bps and 2400 bps only)

&G0

Disables guard tone

&G1

Enables 550Hz guard tone

&G2

Enables 1800Hz guard tone

&Kn

Flow Control (Data Default=3, Fax Default=6)

&K0

Disables flow control.

&K3

Enables bidirectional hardware flow control (RTS/CTS)

&K4

Enables Xon/Xoff software flow control.

&M0

Communication mode control-asynchronized mode only

&Pn

Dial pulse ratio

&P0

Sets 10-pps pulse dial with 39%/61% make-break

&P1

Sets 10-pps pulse dial with 33%/67% make-break

&Q0

Communication mode control-asynchronized mode only

&Sn

DSR (Data Set Ready) Option (Default=0)

&S0

DSR will remain ON at all times.

&S1

DSR will become active only during handshaking and the

 

carrier is lost.

&Tn

Self-test commands (Default=0)

&T0

Terminate test in progress.

&T1

Initiate Local Analog Loopback.

&T3

Initiate Local Digital Loopback.

&T4

Grants RDL request from remote modem

50

Page 50
Image 50
Jaton V.90 user manual DCD Data Carrier Detect option Default=1

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.