Fax and Telecom Testing Blog -

New FaxLab 7 Product for T.30 and T.38 Fax Interoperability Testing

QualityLogic is pleased to announce a major upgrade to the FaxLab fax interoperabilty testing tool. FaxLab is used by device manufacturers, network equipment providers, and carriers to simplify the process of fax device compatibility testing. It tests...

Published 13 Mar 2009 3:43 PM by Steve Kang

Filed under: Fax Interoperability, Fax Test, Fax Problems, T.30 Test, T.38 Test

Fax Book and Free Test

For those of you working with Fax of IP, an interesting book called "Fax, Modem, and Text for IP Telephony" was recently published by Cisco Press. This book covers both T30 and T38 basics, as well as much more. It has very positive reviews on...

Published 31 Oct 2008 3:27 PM by Jim Zuber

Filed under: Fax, t.38, t.30, telecom industry

What is NSF... and why should I care?

In the late '70s, T.30 was created to make fax machines something they had never been before, interoperable. But many of their manufacturers wanted to go outside of T.30 and continue to use some of their non-standard tricks and abilities. The integrated...

Published 23 Oct 2008 1:53 PM by John Lunsford

Filed under: Fax, t.30, telecom industry

V.34 to V.17 Can Be a Hard Fall

Now that the V.34 compatibility battle is finally being won, a new problem has surfaced. How do two fax terminals that were attempting to use V.34 mutually decide to abandon it, fall back to V.17 and complete sending their pages? When the "Super...

Published 22 Oct 2008 8:26 PM by John Lunsford

Filed under: Fax, t.30, Tips and Tricks, telecom industry

Fax Transmission Power — More Is Not Always Better

There is an article of faith among analog electronics engineers that, if you have to send a signal through difficult conditions, pumping up the power is a good, time honored approach to doing so. But, what about distortion? Somewhere power boosts have...

Published 8 Oct 2008 7:43 PM by John Lunsford

Filed under: Fax, t.30, Tips and Tricks, telecom industry

ITU E.450 Figure Of Merit – The User’s Point of View

The dichotomy of fax protocol conformance versus interoperability becomes most pointed when it is necessary to gauge the performance of a fax terminal. A Quality of Service (QoS) standard is simply a necessity for this type of evaluation. The ITU undertook...

Published 1 Oct 2008 9:23 PM by John Lunsford

Filed under: Fax, t.30, Tips and Tricks, telecom industry

Version 3 of T.38 — It's Likely to be in Your Future

Economic conditions being what they are, the Fax over IP (FoIP) user community is looking for an edge. V.34 'Super G3' fax, covered by version 3 of T.38, makes Internet fax transmissions really move saving money and bandwidth. The original version...

Published 24 Sep 2008 9:01 PM by John Lunsford

Filed under: Fax, t.38, telecom industry

Comparing Fax Call Data From Different Sources

How can data files that monitor the same test call but come from disconnected sources be directly compared with each other? In the Post Mortem Analysis of T.30 and T.38 Traffic posting, I pointed out that QualityLogic's DataProbe T30-T38 Analyzer...

Published 18 Sep 2008 8:16 PM by John Lunsford

Filed under: Fax, t.38, t.30, telecom industry

Fax Conformance vs. Interoperability — How do you strike the balance?

For years, fax device manufacturers have pondered the question of how much accommodation they should make for non T.30 compliant devices. Too little and customers complain about inability to send their pages, too much and development costs soar. The roots...

Published 18 Sep 2008 12:36 PM by John Lunsford

Filed under: Fax, t.38, telecom industry

Post Mortem Analysis of T.30 and T.38 Traffic

Facsimile traffic has followed voice traffic in its migration to the Internet. Historically, the T.30 protocol has been used to transmit facsimile messages over the traditional PSTN network. Because T.30 contained a variety of timing constraints that...

Published 15 Sep 2008 6:42 PM by John Lunsford

Filed under: Fax, t.38, t.30, Analysis, Dataprobe, Tips and Tricks

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New FaxLab 7 Product for T.30 and T.38 Fax Interoperability Testing

Fax Book and Free Test

What is NSF... and why should I care?

V.34 to V.17 Can Be a Hard Fall

Fax Transmission Power — More Is Not Always Better

ITU E.450 Figure Of Merit – The User’s Point of View

Version 3 of T.38 — It's Likely to be in Your Future

Comparing Fax Call Data From Different Sources

Fax Conformance vs. Interoperability — How do you strike the balance?

Post Mortem Analysis of T.30 and T.38 Traffic