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- HAYES ANNOUNCES SUPPORT FOR NEW CCITT V.42 STANDARD
-
- ATLANTA, GA., May 2, 1988 - In continuing support of international
- standards, Hayes Microcomputer Products, Inc. announced today that it
- will provide products implementing the new CCITT Recommendation V.42
- for point-to-point modem error-control. Hayes will offer a firmware
- upgrade for present and past V-series system products to make them
- compatible with the new V.42 standard.
-
- "We have taken an active role in the evolution of the new standard
- and will continue to contribute to the work of the CCITT and ANSI to
- develop new standards and enhance existing ones," said Hayes President
- Dennis C. Hayes. "The knowledge acquired concerning HDLC-based
- protocols during the LAPB implementation for our V-series system
- products will enable us to quickly respond to the V.42 needs of the
- marketplace."
-
- Establishment of the V.42 standard resolves the issue of
- point-to-point modem error-control and enables the communications
- industry to shift its focus to the role played in the future by public
- data networks, X.25 networks and ISDN.
- ###
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- V.42 AND BEYOND: THE FUTURE OF COMMUNICATIONS
-
- After more than three years of extensive development, CCITT
- Recommendation V.42 has been finalized. Following meetings just
- completed in Geneva, Switzerland where it was agreed upon by Plenary
- Modem Study Group XVII, V.42 now goes before the full CCITT for formal
- adoption in November 1988 in Australia.
-
- Hayes was actively involved in the process of developing CCITT
- Recommendation V.42. Along with engineers from other communications
- equipment manufacturers, services suppliers, PTTs and governmental
- representatives, the company has participated in U.S. national
- committees (US CCITT Study Group D Modem Working Party) and
- internationally to share its communications expertise during the
- development of this new standard.
-
- Known as LAPM (Link Access Procedure-Modem), the primary protocol in
- the V.42 standard is based on the Link Access Procedure-D Channel
- (LAPD, used on the ISDN "D" [signaling] channel) international
- standard. Both LAPB (used for error-control in present Hayes V-series
- modems) and LAPD are based on the international standard High-level
- Data Link Control (HDLC) procedures specified by the International
- Standards Organization (ISO). Founding the new V.42 standard on such a
- widely tested, accepted and utilized standard will provide great
- benefits for its implementation. Compliance testing for LAPM will
- benefit greatly from the large body of knowledge in existence
- concerning HDLC-based procedures.
-
- Basing the primary protocol for modem error-control on the LAPD
- protocol adopted by ISO and CCITT supports the position Hayes and many
- others favored during the development of the V.42 standard. By
- developing LAPM, the CCITT has provided a firm foundation for
- continuing work on advanced modem features such as data compression,
- remote configuration and use of multiple virtual circuits. V.42 and
- the existing X.25 standard for communications through public and
- private data networks provide direction to the continuing evolution of
- the dial-up data communications environment.
-
- This new standard is important for the present, but it is even more
- important for the future. V.42 provides the error-control standard for
- point-to-point communication, but that is the limit of its scope. Now
- that point-to-point error-control has been addressed, focus can shift
- to the future and point-to-multi-point communications through the
- Public Data Networks (PDN) based on X.25.
-
- Personal computers are becoming multi-tasking systems whose
- communications needs can be addressed by features such as X.25 PADs.
- Hayes plans to support this need through its X.25 PAD enhancement to
- the V-series system products. By combining the capabilities available
- today through the PDN with the multi-tasking features of the personal
- computer workstation, Hayes will provide solutions to all
- communications network problems. Looking further into the future,
- access to this same PDN will also be possible by way of an Integrated
- Services Digital Network (ISDN) connection which uses a terminal
- adapter with a built-in X.25 PAD.
-
- In keeping with its history of implementing international standards,
- Hayes plans to offer V.42 compatible data communications products in
- the future which will also be compatible with the installed base of the
- company's current V-series system products. Hayes will also offer a
- firmware upgrade for present and past V-series system products which
- will make them compatible with the new V.42 standard.
-
- The CCITT's recommendation of an HDLC-based procedure for modem
- error-control affirms the Hayes decision to base error-control in its
- V-series system products on an extension of the LAPB protocol.
- Knowledge concerning HDLC-based protocols will enable Hayes to quickly
- respond with a V.42 upgrade for the V-series system products. The new
- V.42 standard includes a number of error-control features (XID frames
- and a benign recognition sequence) which Hayes has already successfully
- used in its V-series system products.
-
- CCITT Recommendation V.42, defines error-control for modems based on
- existing international standards. Hayes engineers have taken an active
- role in the development of the new standard, and will continue to work
- as part of the CCITT and ANSI to develop new standards and enhance the
- existing standards.
-
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