home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!mcsun!sunic!ugle.unit.no!news.uit.no!tos.nuug.no!pnilsen!petter
- From: petter@pnilsen.UUCP (Petter Nilsen)
- Newsgroups: comp.dcom.modems
- Subject: USR vfast
- Distribution: world
- Message-ID: <petter.03fj@pnilsen.UUCP>
- Reply-To: cbmehq!cbmnor!pnilsen!petter@cbmvax.commodore.com
- X-NewsSoftware: GRn 1.16e (7/4/92) by Mike Schwartz & Michael B. Smith
- Date: 21 Jul 92 06:17:51 GMT
- Organization: Ultima Thule Software
- Lines: 152
-
- Someone has been asking about the announcement of the vfast modems
- from USR which is upgradable. Well, here it is:
-
-
- U.S. ROBOTICS ANNOUNCES THE LAST MODEM YOU'LL EVER BUY
- Provides Migration Path to Forthcoming CCITT 28.8 Kbps Standard
- ---------------------------------------------------------------
-
- SKOKIE, Ill. -- June 8, 1992 -- U.S. Robotics today announced an upgrade
- program for the CCITT-proposed standard of 28.8 Kbps, previously referred to
- as V.FAST. The Courier V.32bis, Courier HST Dual Standard and Shared Access
- Modem Sharing Kits are the products currently included in the program. Field
- upgrades will be available for $299 as soon as the CCITT 28.8 Kbps draft
- recommendation is completed. Official approval of the standard is not
- expected until January, 1994.
- "The CCITT-proposed 28.8 Kbps standard won't be a reality for most
- manufacturers until 1994," said Jonathan Zakin, U.S. Robotics executive vice
- president, sales and marketing. "By offering modems ready for 28.8 Kbps now,
- we're providing insurance against technical obsolescence. Customers can
- purchase a Courier high-speed modem or Shared Access Modem Sharing Kit now
- and take advantage of the most updated technology available. When the 28.8
- Kbps standard becomes available later, they'll already have a cost-effective
- upgrade option and won't have to re-invest in new equipment."
- "Key to the 28.8 Kbps program is the fact that the upgrade to the
- Courier high-speed modems and Shared Access Modem Sharing Kits can be
- completed by the end user at their worksite, which reduces their `down' time
- and eliminates excess costs like shipping and handling," continued Zakin.
- "You may hear about other 28.8 Kbps modems that are available now, but until
- the standard is defined, no one knows what hardware will be needed to comply.
- Our unique modem architecture makes future `field' upgrades a realistic and
- simple procedure."
- Because of U. S. Robotics' advanced modular modem architecture, the
- company's Courier V.32bis, Courier HST Dual Standard, and Shared Access modems
- are readily upgradable to 28.8Kbps. The modems are made up of a motherboard and
- a smaller daughterboard, which holds the modems' microprocessors and firmware.
- The current, high-speed daughterboard can easily be replaced with a new board
- containing the 28.8 Kbps CCITT standard. U.S. Robotics is the only modem
- manufacturer to implement this kind of flexible design.
- "In the CClTT, the previously called `V.FAST' standard has gained
- universal support at the 28.8Kbps speed," said Dale Walsh, U.S. Robotics vice
- president, advanced development and participant in the CCITT committee on the
- 28.8 Kbps standard, "This is how our modular architecture works. The data
- pump (which executes the modulation and demodulation of the data), and the
- key controller functions (which perform the data compression, error control
- and the AT command set) are on one board, making upgrades simple. We can
- easily make the data pump faster and upgrade the controller functions to keep
- up with the new speed. It's all in just one small plug-in card."
- Because compatibility with CCITT standards is crucial, U.S. Robotics'
- availability and implementation of the 28.8Kbps standard will depend on the
- CClTT's progress. At this time, the standard is expected to define a connect
- speed of 28.8 Kbps, two times faster than V.32bis, the fastest CCITT
- standard now available.
- U.S. Robotics is one of the first vendors to announce a program for
- 28.8Kbps compatibility. The company has a history of industry "firsts,"
- including the first CCITT V.32bis modem from a major manufacturer, the first
- self-managing modem management system and the first portable CCITT V.32
- modem.
- U.S. Robotics will upgrade any Modem Sharing Kit to 28.8Kbps. Current
- Courier models, which have the smaller footprint and a higher, 57.6 Kbps DCE
- to DTE (modem-to-computer) interface speed, are also upgradable. The
- company's upgrade program does not include WorldPort and Sportster modems.
- U. S. Robotics Courier modems offer a wide range of features, including
- fax, remote configuration, and synchronous capabilities. The Shared Access
- Modem Sharing Kits, which began shipping in March, 1992, allow for the
- pooling of modems on a LAN so that a LAN user can access them for dial-in or
- dial-out communications.
- The following products will be upgradable to 28.8 Kbps:
-
- Courier V.32 bis, internal and external (57,600 bps versions only)
- Courier HST Dual Standard, internal and external (57,600 bps versions only)
- Courier V.32 bis FAX, internal and external
- Courier HST Dual Standard FAX, internal and external
- Shared Access Modem Sharing Kit Single Port and Dual Port
-
- THE CCITT 28.8 KBPS STANDARD: SOME BACKGROUND
- ---------------------------------------------
-
- The standard for 28.8 Kbps dial-up communications being developed by the
- CCITT will stretch the limits of dial-up telephone lines. But don't expect
- to be sending files at top speeds immediately.
- Dale Walsh, vice president for advanced development at U.S. Robotics,
- Inc., cautions that most users won't be able to achieve the maximum speeds
- permitted under the standard right away. When the standard is adopted, modems
- that conform should be able to transmit at 19.2 Kbps on lines where a modem
- conforming to V.32bis (the current high-speed standard) can now transmit at
- 14.4 Kbs. But Walsh, a member of the CCITT committee developing the
- standard, says it is being formulated with the increasing digitization of
- dial-up phone networks in mind.
- The improved quality of phone lines, as much as any modem technology
- improvements, has made high speed dial-up communications possible" says
- Walsh. "We are designing the standard keeping in mind that phone networks
- will use more and more digital circuits and digital central office switches."
- Consequently, speeds in the neighborhood of 28.8 Kbps will be the
- exception, rather than the rule--at least until the public switched
- telephone network becomes completely digital.
- "I'd say when it's finished in a year or so, the standard will allow
- 19.2 Kbps transmissions on 80 percent of all lines, 24 Kbps on 50 percent of
- all lines, and 28.8 Kbps communications on 20 percent of all lines," says
- Walsh, who also helped develop the CCITT V.32bis standard for 14.4 Kbps
- dial-up communications. "As the phone networks improve, top speeds will be
- more easily achieved, so I think it's more realistic to think of it as a
- 19.2 Kbps standard that is sometimes capable of higher speeds.
- A common misconception is that the coming 28.8 Kbps standard will allow
- speeds of 115.2 Kbps, when combined with V.42bis data compression. Walsh noted
- that such calculations are based on an assumption that V.42bis allows 4 to 1
- data compression. Outside the lab, V.42bis allows compression ratios between
- 2 to 1 and 3 to 1, meaning that under REAL LIFE conditions, the forthcoming
- standard will allow maximum throughput of about 86.4 Kbps.
- "It's a mistake to use the 28.8 number and max everything out from that,"
- said Walsh.
- Not that the 28.8 Kbps standard doesn't have its advantages. After all,
- 19.2 Kbps is an improvement over 14.4 Kbps. And the forthcoming standard will
- adjust for line conditions, a critical factor in high-speed data
- communications--like no previous standard. The standard under development
- will include a "probing" function that the modem can use to "sound out" the
- quality of the phone line. That will allow the modem to optimize transmissions
- to take advantage of available bandwidth.
- "We are still working on the training sequences," says Walsh. "But before
- transmission starts, the standard will enable the modem to determine what band-
- width is available and how to best position the signal to match available band-
- width."
- The standard achieves higher speeds through its ability to use more of a
- line's bandwidth, not just the center portion of the channel used under current
- standards.
- "It will more closely match the modulation scheme to what's available,"
- says Walsh. "That way, the modem can shape the transmissions to adapt
- precisely to the channel, which is very important if you want to transmit at
- high speeds.
- The most recent committee meeting was held last month. Still to be
- agreed upon are such critical issues as training sequences, coding schemes, and
- signaling rates. Walsh said he expects the committee to reach final agreement
- in 1993, with official CCITT adoption likely in 1994.
- While some have taken to calling the standard under development V.Last,
- Walsh isn't convinced this will be the final modem standard. After all, he
- notes, no one thought dial-up phone lines would ever be this noise-free, and
- further advances in that area could make even higher speed dial-up
- communication possible.
- "I'm certain we'll have at least a fax version of this standard as the
- quality of phone lines keep improving," he said. "We're trying to be sure that
- this standard will serve users into the year 2000. But modem standards are
- like wars: you always think it's going to be the last one."
- U. S. ROBOTICS, INC, (NASDAQ:USRX) (800)DIAL-USR voice for more infor-
- mation.
-
-
-
- ---
- \\\\\\ Snailmail: |\
- \\\\\\ Petter Nilsen, Box 1121, N-9601 HAMMERFEST, NORWAY | \
- >>>>>>========================================================| >
- ////// UUCP: cbmehq!cbmnor!pnilsen!petter@cbmvax.commodore.com | /
- ////// -> Save the whales -- harpoon a Norsk Data computer! <- |/
-