German Definitive Tele-Facsimile Test
With the advent of Internet Email communications, facsimile machines still play a dominant role in personal and business intercommunications. When Germany started importing facsimile machines in the 1970's, the Deutsche Bundespost (German PTT) created the Facsimile Test Standard FTZ 18TR53.
The German Facsimile Test Standard FTZ 18TR53 was a mandatory test for all Facsimile machines sold in Germany. With the advent of Telecommunications deregulation, the Regulatory Approval standards have been reduced to a Network Access only, and the Facsimile Test standard FTZ 18TR53 is no longer mandatory.
However since the T.30 protocol is implemented differently by each Facsimile manufacturer, many manufacturers were finding that their facsimile products did not interwork properly with other facsimile machines. Thus a single test suite, based on the original T.30 ITU Recommendation, was needed to serve as the Reference Standard.
Approximately 18 manufacturers and distributors formed the Telefacsimile Work Group within the German Machinery and Plant Manufacturers Association (VDMA). The Telefacsimile Work Group
members, as listed in Table 1, developed a T.30 Test Suite which was named "Definitive Tele-Facsimile Standard" (DTS).
Table 1, Members of
Telefacsimile Work Group
The technical requirements of the DTS Test Suite are an enhancement of the original German FTZ 18TR53 and ITU T.30 Standards.
Therefore, if a manufacturer's product passes all 1339 test cases (with several test parameters derived from the DTS Test Suite), the manufacturer can be assured that his product will interoperate reliably with any facsimile machine in the world, if it has also been tested to the DTS Test Suite. In addition, the Manufacturer is permitted to apply the DTS
Mark as proof that his product is fully compliant.
The DTS Test Suite verifies each and every process of the following operations:
Negotiation of resolution
Negotiation of paper size (metric or imperial)
Negotiation of coding method and line timing
ECM (Error Correction Mode)
Negotiation of transmission speed
Facsimile Data transmission & Reception
Handshake between the Receiving and Sending of data
Receive/Send report in journal
WHICH CARRY THE DTS MARK
of Products which carry the DTS Mark has grown to 45 pages as of March
2002. The 45 page list of DTS Approved Facsimile Products can be
downloaded at DTS Listed Facsimile
When purchasing a Facsimile Machine with the DTS
Mark, the end user can be assured that the manufacturer has conducted
facsimile protocol testing to the DTS Industry Standard, and that the product will inter-operate
properly with other facsimile devices.
About the Authors:
Dipl.-Ing. Frank Weisser.