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Fax Gets a Boost with V.34 Standard

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TMCnews Featured Article


April 01, 2010

Fax Gets a Boost with V.34 Standard

By David Sims, TMCnet Contributing Editor


Fax - due in part to fax server and FoIP-based technologies - is certainly not dead, as some have wrongly said. It continues to be an important and cost-effective means for business-to-business and business-to-customer communications.

In fact, more than 90 percent of U.S. businesses have fax machines in the office, a recent white paper from Dialogic (News - Alert) reports, adding that “sales of fax machines in recent years have maintained a steady growth rate… more than 7.5 million fax machines were sold in 2002 alone.”


Recent advancements in fax technology have resulted in a renewed interest in fax in the business environment. This white paper looks at one such advancement, the introduction of the V.34 fax standard, which the paper concludes “can help increase productivity and reduce costs.”

The paper discusses the V.34 fax standard features, and how the adoption of 33.6 kbps fax devices can help with cost savings.

The V.34 fax standard was established by the International Telecommunications Union as the standard for full- duplex modems sending and receiving data across phone lines at up to 33.6 kbps. Compared to the V.17 (14.4 kbps) standard and 9.6 kbps fax, V.34 is faster and more adaptable to varying line conditions – in other words, fewer resends.

With a 9.6 kbps or a V.17 modem, the “handshaking,” establishing a connection, is done at 300 bps. With V.34 fax, the paper says, “the handshaking is done at a much faster rate of 1200 bps. The result is that handshaking time is reduced from approximately 16 seconds with 9.6 kbps and V.17 to about seven seconds with V.34.”

And for transmission, V.34 provides what Dialogic officials describe as “currently the widest range of supported data transmission rates.” After each page is transmitted in a V.34 system, a retraining or re-synchronizing process is done between each additional page until the fax call is completed.

The line probing feature included allows a V.34 device to choose operating parameters for any given connection. The connected devices use this line analysis to choose several key operating parameters. As a result, V.34 allows devices not only to adapt to a broad range of different line types and distortions from call to call, but also to accommodate varying line conditions over long periods of time.

“V.34 is an important development in fax technology,” the paper concludes, “not only because it can send fax data more than twice the speed of the older fax standards, but also because it supports fast handshaking, which can cut call setup and session-management time by one-third.”

Plus, the paper says, the V.34 protocol is highly adaptive, automatically and intelligently applying a tailored combination of modulation methods and impairment-compensation techniques for each fax call: “These can translate to faster fax transmissions and significant cost savings over time.”

Read the full white paper here on the FoIP channel.


David Sims is a contributing editor for TMCnet. To read more of David’s articles, please visit his columnist page. He also blogs for TMCnet here.

Edited by Michael Dinan







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