Multimedia high speed network

• US 5,303,266 A
• Filed: 12/28/1990
• Issued: 04/12/1994
• Est. Priority Date: 06/08/1990
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Company (HP Inc.)
• Original Assignee: Chipcom Corp. (HP Inc.)
• Inventors: Snyder, Robert, Lee, Jack W., Budin, Daniel, Linde, Yoseph, Saussy, Gordon
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): TSE, YOUNG TOI
• Application Number:
  US07/635,486
• Time in Patent Office: 1,201 Days
• Field of Search: 375/12, 375/36, 375/7, 370/85.9, 370/85.13, 370/85.14, 370/94.1
• US Class Current: 375/257
• CPC Class Codes: H04B 3/06 by the transmitted signal
• CPC Class Codes: Y10S 370/906 Fiber data distribution interface, FDDI

Abstract

A system is provided implementing an extremely high speed link allowing selection of either twisted pair (or like media) and fiber media in to provide a high speed multimedia local area network. A high speed transmission link for twisted pair, coaxial cable media or the like includes a transmitter with a conversion device for receiving fiber optic data interface signals intended to drive a fiber optic data interface and for converting these fiber optic data interface signals into high speed transmission link signals of a form suitable to drive a twisted pair medium. A receiver is provided and includes a reconversion device for regenerating the signal received from the twisted pair medium back to an adequate signal level. The transmitter conversion device includes a buffer cooperating with an equalizer and a filter for forming the high speed transmission link signal. The equalizer provides frequency domain compensation for the characteristics of the twisted pair medium. The filter rejects signals outside a band of data signaling. The receiver reconversion device includes a filter connected to said twisted pair medium to reject signals outside a band of data signaling, a buffer for regenerating the signal received from the twisted pair and a low frequency restoration circuit which employs a decision feedback technique for the compensation of the media coupling circuit'"'"'s low frequency response.

Claims

1. An extremely high speed transmission link system, comprising:

a transmission cable formed from one of twisted pair, shielded twisted pair, coaxial cable media or the like, said cable having frequency domain characteristics which distort high speed data transmission;

a transmitter connected to said cable, said transmitter including conversion means for receiving high speed data transmission signals and for converting said high speed data transmission signals into high speed transmission link signals operating at a rate above 32 megabauds and up to 125 megabauds, said high speed transmission link signals being composed to overcome said frequency domain characteristics which distort said high speed data transmission signals;

a receiver connected to said transmitter via said transmission cable, said receiver including reconversion means for regenerating a signal received from said transmission cable to an adequate signal level; and

a concentrator platform connected to either one of said transmitter or said receiver, said concentrator platform including signal channel means for transferring said high speed data transmission signals, said concentrator platform including another transmitter and another receiver, said channel means transferring said high speed data transmission signals between said one of said transmitter or said receiver, and said another transmitter or receiver connected to said concentrator platform.

2. A system according to claim 1, wherein said concentrator platform includes control means for establishing said high speed data transmission signal for an FDDI local area network defined by ANSI X3T9.5 standard between a transmitter and a receiver connected to said concentrator platform.

3. An extremely high speed transmission link system according to claim 1, wherein said conversion means includes a buffer cooperating with an equalizer and a filter for receiving said high speed data signals and forming said high speed transmission link signal, said equalizer providing frequency domain compensation to said high speed transmission link signal for compensating distortion caused by said cable, said filter rejecting signals outside a band of data signaling of said high speed transmission link signal.

4. An extremely high speed transmission link system according to claim 3, wherein said transmitter further includes a balancing circuit for coupling a signal from said filter onto said cable, said balancing circuit insuring signaling balance on two wire portions of said cable selected, promoting good signal quality and reducing radiated emissions.

5. An extremely high speed transmission link system according to claim 1, wherein said receiver reconversion means includes a filter connected to said cable to reject signals outside a band of data signalling and to limit radiated emissions and a buffer for regenerating said signal received from said cable back to an adequate signal level.

6. An extremely high speed transmission link system according to claim 1, wherein said receiver includes signal detect circuit means for distinguishing between a presence and an absence of an input signal.

7. An extremely high speed transmission link system according to claim 1, wherein said concentrator platform includes at least one physical channel and slots connected to said at least one physical channel for receiving media dependent modules.