Hardware - Buyers give high marks to Hayes modems for their fast compression capabilities.

 Buyers give high marks to the fashion
 Hayes moms for the opportunity to quickly
 compression.                                  
                                          
                            Martha Tracy  
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      Buyers of one of the first modems,
 corresponding to the V.42 compression protocol
 encore, note their satisfaction with achieving
 by increasing the productivity of the mod-
 ma.                                      
      "We were looking for something that could
 give [users] a higher pro-
 productivity and would allow them to move
 [from standard modems with transfer speed
 transmission 2400 bps] without burning or disintegrating
 selling old equipment," he said
 Larry Roessl, technical specialist at
 data transmission area of the corporation
 OWens-Corning Fiberglass Corp., manufacturer
 fiberglass products, Tole-
 to, Ohio. This corporation added to
 a dozen of its V.32 9600 bps modems
 Microcom Inc. new V-series modems
 Smartmodem 2400 V.42 from Hayes
 Microcomputer Products Inc.              
      OWens-Corning Selects Hayes Modems
 V.42 bis for several reasons, said
 Roessl.   Although the company was satisfied with the
 the V.32 standard modems it uses are
 transmission speed9600 bps, they are
 in Mr. Roessl's opinion, were too pre-
 horns for all users. And, until now
 since then, the only opportunity to use
 take advantage of the MNP compression ratio
 Class 5 for V.32 modem, was used
 communication on the receiving side of another modem
 V.32 MNP Class 5.                        
      "The V.42 bis protocol modem was also
 mutually compatible with modems, even with
 lower transmission speed than models
V.32 protocol,” added Mr. Roessl.
      "We are interested in modems of the series
 V Smartmodem 2400 V.42, because they knew
 that they comply with the MNP 5 protocol" -
 Roessl said. - "We wanted to get co-
 2:1 compression ratio when calling (dialing
 numbers) of our MNP 5 protocol modems
 [Microcom V.32] - modem [Hayes] you
 delivers what it promises while being compatible with
 MNP 5" protocol. In addition, the modem series
 V Smartmodem 2400 V.42 costs 400 dollars
 lars less than Microcom V.32 modems.  
                                          
                                          
     High data compression ratio    
    ───────────────────────────────────   
                                          
      Roessl noted that he achieved a
 compression ratios 2:1 or 3:1 when tested
 modem protocol V.42 bis, using
 using the following software
e: 3270 protocol converter, proto-
 asynchronous communication stakes XMODEM and Kermit; and
 Microcom software
 Relay Gold.                              
      Mr. Roessl, satisfied with the fashion
 Mami V series for user purposes, bu-
 children can expect the release of new prototype modems
 cola V.32/V.42_bis, which could find
 ty wider use by the company
 OWens-Corning.                           
      Briggs Project Coordinator
 & Stratton Corp., which produces small
 gas engines in Wauwatosa, State
 Wisconsin, Bob Eccher, like Roessl, re-
 trades V.42 protocol data compression
 encore, noting that the V series modem allowed
 obtain transmission results, compare
 compatible with the results obtained when using
 using a V.32 protocol modem.       
      Manufacturer of aluminum products
 Aluminian Co.   of America (Alcoa),
 Pittsburgh, to satisfy its needs
 needs in access to remote terms -
 Lama purchased five Hayes V.42 modems
 bis, noted a specialist from this company Ha-
 Rold Winter.                            
      Alcoa needed to provide
 tell several of your subscribers to distance
 online access to the central computer. Presentation
 Hayes in Atlanta believes that
 Alcoa moves away from standard Smartmodem
 2400 to modems,corresponding to the standard
 there are V.42 bis and V.42.                     
      "Modems [V.42 bis] give us
 significant advantage compared to
 [standard] modems with speed
 2400 bps transmission," Winter explained.
 - "We achieved a compression ratio of 3:1
 compared to a standard modem with high speed
 transmission speed is 2400 bits/sec. Using
 on one end of the V series modem, we increase
 determined the throughput to be three times
 for".                                     
                                          
                                          
      V.32 and V.42 bis modems
      Gut ahead of some PCs          
      ────────────────────────────────────
                                          
                              Dave Metbuh 
                              ─────────── 
                                          
      When using V.32 modems,
 latest modifications reaching speed
 transmission 38400 bps, users can
 are about to encounter a situation where their PC
 will not be able to maintain contact. In some
 In cases the data comes from our modem
 just quickly that some PCs can
 lose one or more characters.          
      The PC is designed to be semi-
 receive data from the serial port,
 connected to the modem: one character per
 unit of time. Once the symbol is half-
 chen, the serial port generates
 interrupt indicating presence
 character intended for processing
 personal computer.  If the second
 character received before the first one
 read by the PC, the first character will be lost.  
      If the modem transmission speed is reached
 9600 bps and higher, PC tests
 lack of time to process the symbol
 ed to receive the next one.               
      Programs like VDISK.SYS provide
 baking for use in a DOS virtual environment
 virtual RAM disk, installed
 misrepresent the problem due to the impossibility of
 jerking for long periods of time.
 Similarly, Microsoft WindoWs/386 does
 interruptions are impossible and may lead to
 to the loss of characters on personal computers
 rum                                     
                                          
 Problem and solution            
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      Along with the advent of modems, corresponding
 conforming to the V.42 bis standard, maybe
 a new problem will appear. These modems can
 can send data at speeds up to
 38400 bps, overloading the PC.            
      "Right now, while there is no one
 V.42 bis modem, you need to solve this
 problem," he said inearly 1990
 Bill Schlosser, head of development services
 company Universal Data Systems Inc.,
 modem manufacturer in Huntsville,
 Alabama.                                 
      One solution was proposed by the company
 nyaya Hayes Microcomputer Products Inc.,
 Norcross, Georgia - Upgraded -
 serial port (ESP -
 Enchanced Serial Port) with Upgraded-
 serial interface (ESI -
Enchanced Serial Interface).    ESP
 is a two-port board
 serial interface with buffer
 1 kilobyte capacity, intended as
 for transmitting and receiving characters.
 Large buffer avoids losses
 characters at high transmission speeds. 
      ESP Cost for Micro Architecture
 Channel - $349, AT bus version
 costs $299.                      
      Hayes faced a problem
 data loss when developing an external module
 dema Ultra Smartmodem 9600 protocols
 V.32/V.42 bis.                           
      "A regular IBM PC XT computer and even
 IBM PC AT with a frequency of 8 MHz cannot receive
 chat and send data at speeds
 corresponding transmission speed mode-
 ma," explained John Copeland, vice president.
 System Programming Resident
 Hayes Microcomputer Products.- "We
 we expect that our retailers
 will sell an Ultra model with an ESP board
 those users who can
 face this problem."           
      ESI is a specification
 defining the hardware interface to the board
 ESP. Because this board is bottom compatible
 up with standard technical support
 changing serial ports, changing
 no software required.
 However, software developers
 improvements can use improvements
 Bathroom capabilities of ESI, such as inaccessible
 sparse memory access, for higher
 software performance
 Baking the operation of communication channels.            
      Application programs written for
 ESI, can unload some modes
 input/output, transferring them to the ESP board and OS
 freeing up your PC to perform other functions.
      The only drawback of the ESP board is
 when using it with an external modem
 is the need to purchase it
 separately for $300. She, like
 built-in modem, uses the connector
 tire width.                            
      Built-in modems can use
 ESP type buffering method because
 The modem board has its own pos-
 research port. However, make
 whether built-in modems can currently
 time and don't followthis course. If
 they will still add this feature, built-in
 new modems may become even more valuable
 mi.