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  1. Technology
August 9, 1988


By CBR Staff Writer

Telebit Corp of Mountain View, California has entered the Personal System/2 modem market with a high speed internal modem card for IBM PS/2 Models 50, 60, 70 and 80. Modestly calling itself TrailBlazer Plus PS, the new product is an extension of the Telebit high-speed TrailBlazer Plus range, and sits in a Micro Channel expansion slot to support error-free asynchronous communications over ordinary telephone lines at transmission speeds up to 19.2Kbps. The performance is claimed to be made possible by Telebit’s patented technology, Packetised Ensemble Protocol or PEP, which splits the telephone bandwidth into hundreds of independent data channels so that data can be sent across the entire bandwidth of the telephone line. The TrailBlazer supports built-in protocol support, remote configuration and diagnostics and fast, error-free transmission over a wide range of dial-up lines. The TrailBlazer Plus PS automatically adjusts its operating speeds and modulation schemes to operate with the existing installed base of 19.2Kbps and 18K bps PEP modems and with low-speed CCITT V.22 bis 2,400 bps and V.22 1,200 bps, and with Bell 212A 1,200bps and 103J 300 bps modems. It is addressable through any of the Micro Channel’s eight communications ports and supports the industry-standard command set. Error correction is provided by the Packetised Ensemble Protocol at high speeds and the MNP error-correction protocol at low speeds. In deteriorating line conditions, the TrailBlazer Plus PS adjusts its data rates in 100 bps increments, avoiding the one-third to one-half transmission rate drops found in conventional dial-up modems. Integrated support for Kermit, Xmodem, Ymodem and UUCP, the AT&T Unix system communications utility is also catered for. Built-in support for industry standard file-transfer protocols also enables it to support a wide array of off-the-shelf software packages. Retail prices for the TrailBlazer Plus PS in the US are $1,295 with HyperAccess communications software, and $1,195 without HyperAccess.

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