3-4 CHAPTER 3: TROUBLESHOOTING

If you are unable to establish a data call, carefully monitor the B-1 and B-2 LEDs while attempting a data call. The B-1 and B-2 LEDs flash green during the data call establishment phase. They then remain continuously green once the data connection is established.

If neither of the B-1 or B-2 LEDs flashes green, check to make sure that your computer is turned on and operational, that your 3Com Impact digital modem cable is properly connected and not damaged, and that your application software has sent an AT dial command in the proper format.

Depending upon the location of the destination call you are dialing, there may be an incompatible local or toll telephone company. Though this is less likely, if you suspect a telephone company problem in dialing local or toll data connections, contact your local telephone company and have it verify that you can dial a data call to the destination telephone number.

7If you are able to establish a data call, in which the B-1 or B-2 green LED remains lit and you receive a CONNECT message at your application software, but you are unable to send data, then it is possible that:

There is a difference in the local and remote B channel data rates.

There is a mismatch in the data communications protocols.

There is an interoperability mismatch between the local and remote applications.

Make sure that the local and remote data applications have communication capability and are properly configured. Once you have verified that communication capability exists, make sure that the B channel call data rate is the same as the remote destination call data rate. The default B channel data rate used by the digital modem is 56 Kbps. Under some circumstances, the data rate may be increased to 64 Kbps at both ends of the connection.

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3Com DIGITAL MODEM manual Troubleshooting

DIGITAL MODEM specifications

The 3Com Digital Modem represents a significant advancement in communication technology, designed to enhance data transmission over telephone lines. This modem is a part of a lineage of 3Com products that focus on delivering robust networking solutions, tailored for both personal and professional use.

One of the main features of the 3Com Digital Modem is its high-speed data transfer capabilities. With speeds reaching up to 56 Kbps, it allows users to send and receive large amounts of data quickly, which is essential for applications that require efficient data exchange. This speed ensures smoother internet browsing, quicker downloads, and more reliable connections for applications such as video conferencing and online gaming.

The modem is equipped with advanced error correction technologies, including V.42 and V.42bis protocols. These protocols help to maintain data integrity by detecting and correcting errors during transmission. This results in a more reliable connection, reducing the likelihood of dropped calls or corrupted data transfers, which can be particularly frustrating for users engaged in critical business communications.

Another notable characteristic of the 3Com Digital Modem is its compatibility with various operating systems, making it versatile for different users. It supports Windows, Mac, and various other platforms, ensuring that it can be integrated seamlessly into existing systems without the need for extensive configuration. This plug-and-play capability simplifies installation for users, allowing them to get connected quickly and efficiently.

The modem also incorporates an innovative design that facilitates improved heat dissipation, ensuring optimal performance during prolonged use. Its compact form factor makes it suitable for both home and office environments, allowing for easy setup without consuming excessive desk space.

In addition to these features, the 3Com Digital Modem boasts strong security protocols, ensuring that users' data is protected against unauthorized access while being transmitted. This is particularly important in today’s digital landscape, where data breaches and cyber threats are prevalent.

Overall, the 3Com Digital Modem combines speed, reliability, and security, making it a valuable asset for anyone looking to enhance their connectivity experience. Its robust feature set and user-friendly design cater to a broad audience, from casual users to business professionals, reflecting the evolution of modem technology in a digital-first world.