MultiModemZPX User Guide

C Loopback Tests

3.Enter characters from your keyboard. For this test, typing multiple uppercase U characters is a good way to send an alternating test pattern of binary ones and zeros. The characters entered should be displayed on your monitor.

4.To exit the test, type the escape sequence +++AT and press ENTER. This puts the modem in online command mode. Then type either AT&T or ATH to return to command mode.

5.Your modem passes this test if the characters received on your monitor are the same as the characters entered from your keyboard. If different characters ap- pear on your monitor, your modem is probably causing the problem, though it could also be your computer. If your modem passes this test, but you are receiv- ing errors while on line, the remote modem or the phone line could be at fault.

Remote Digital Loopback Test (V.54 Loop 2)

The remote digital loopback test tests the phone lines and the circuits of both your local modem and a remote modem. In this test, your modem must be on line with another modem that is set up to respond to a request for remote digital loopback.

(Note that some modems might not support remote digital loopback or might have it disabled.) Data from your computer or terminal is transmitted through your mo- dem and over the phone line to the remote modem, where it is then looped back to your modem.

AT&T6

OK UUUUUUUUUUU UUU

Digital Analog

Analog Digital

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AT&T6

OK

Computer or Terminal Local MultiModem

Remote MultiModem Computer or Terminal

Figure C-2. Remote digital loopback test.

Test procedure

1.Arrange to have &T6 set on the remote test modem.

2.Using your communication program, set the baud rate to 9600 and go into ter- minal mode. Type AT and press ENTER; you should get an OK message. Type AT\N and press ENTER to disable error correction.

3.Dial the remote modem and establish your online connection.

4.Type the escape sequence +++AT and press ENTER to bring your modem into online command mode.

5.Type AT&T6 and press ENTER. The local modem responds to this command by transmitting an unscrambled marking signal, which causes the remote modem to place itself in digital loopback mode. Then the local modem exits online com- mand mode and enters data mode.

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Multi-Tech Systems MT5634ZPX-PCI-V92 Remote Digital Loopback Test V.54 Loop, Figure C-2. Remote digital loopback test
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MT5634ZPX-PCI-V92 specifications

The Multi-Tech Systems MT5634ZPX-PCI-V92 is a high-performance V.92 data/fax modem designed to enhance communication capabilities in various applications. This modem is particularly well-suited for commercial and industrial environments where reliable connectivity is crucial.

One of the standout features of the MT5634ZPX-PCI-V92 is its support for the V.92 protocol, which allows for quicker uploads and improved connection speeds compared to earlier standards. It offers download speeds of up to 56 Kbps and upload speeds of up to 48 Kbps, making it an excellent choice for businesses that rely on time-sensitive data transmission. The modem's ability to maintain reliable connections even over noisy telephone lines is a critical aspect of its design, ensuring that users can depend on it for essential communications.

The MT5634ZPX-PCI-V92 also includes advanced error correction and data compression technologies, such as MNP 4 and V.42bis. These technologies work together to ensure data integrity during transfers and to maximize throughput, enabling users to send larger files without compromising quality or speed. Additionally, the modem features a robust fax capability, supporting both analog and digital fax transmissions, which is vital for businesses that frequently deal with document sharing.

A notable characteristic of the MT5634ZPX-PCI-V92 modem is its PCI interface, which allows for easy integration into desktop systems. This plug-and-play capability simplifies installation and setup, making it accessible for users with varying levels of technical expertise. The modem is built on a reliable hardware platform, characterized by its durable components, making it ideal for environments where long-term use is expected.

Moreover, the MT5634ZPX-PCI-V92 comes with comprehensive driver support for various operating systems, including Windows and Linux, ensuring compatibility with a wide range of applications. With its combination of speed, reliability, and ease of use, the Multi-Tech Systems MT5634ZPX-PCI-V92 modem remains a popular option for businesses looking to maintain effective communication channels through dial-up connectivity. Whether for data transmission or faxing, it stands as a solid choice for organizations that require dependable performance in a compact form factor.
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