Multimedia high speed network

• US 5,305,350 A
• Filed: 06/08/1990
• Issued: 04/19/1994
• 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: Budin, Dan, Snyder, Robert, Lee, Jack W., Linde, Yoseph, Saussy, Gordon
• Primary Examiner(s): Safourek, Benedict V.
• Application Number:
  US07/535,033
• Time in Patent Office: 1,411 Days
• Field of Search: 375/12, 375/36, 375/37, 375/60, 370/85.9, 370/85.13, 370/85.14, 370/94.1, 455/601, 455/606, 455/611, 455/612, 359/115, 359/119, 359/120, 359/152, 359/153, 359/154, 359/161, 359/164, 359/167, 359/184, 359/189
• US Class Current: 375/232
• CPC Class Codes: H04B 3/06 by the transmitted signal

Abstract

A system is provided implementing an extremely high speed link allowing selection of either twisted pair (or like media) and fiber media in a single local area network to provide a high speed multimedia local area network. A high speed transmission link for twisted pair, coaxial cable media or the like is provided including a transmitter with a conversion device for receiving fiber optic data interface signals intended to drive a fiber optic data interface and for converting said fiber optic data interface signals into high speed transmission link signals of a form suitable to drive a shielded twisted pair medium. A receiver is provided including reconversion apparatus for regenerating the signal received from the shielded 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 shielded twisted pair medium. The filter rejects signals outside a band of data signaling. The receiver reconversion apparatus includes a filter connected to said twisted pair medium to reject signals outside a band of data signaling and to limit radiated emissions and a buffer for regenerating the signal received from the shielded twisted pair and filtration by said filter and regenerating the signal back to an adequate signal level.

Claims

1. An extremely high speed transmission link system for transmitting fiber optic data interface signals on a medium selected from twisted pair, shielded twisted pair, coaxial cable media or the like, comprising:

a transmitter including conversion means for receiving the fiber optic data interface signals intended to drive a fiber optic data interface and said conversion means being also for converting said fiber optic data interface signals into high speed transmission link signals of a form suitable to drive said medium selected, said conversion means includes a buffer for receiving said fiber optic data interface signals and for forming said high speed transmission link signal via an equalizer and a filter, said equalizer amplifying specific frequencies of said high speed transmission link signals for counteracting frequency domain characteristics of the medium selected, said frequency domain characteristics which distort said fiber optic data interface signals and render said fiber optic data interface signals substantially unrecognizable, said filer rejecting signals from said high speed transmission link signals that are outside a band of data signaling; and

, a receiver, connected to said transmitter by said medium selected said receiver including reconversion means for regenerating the signal received from said medium selected back to an adequate signal level.

2. An extremely high speed transmission link system according to claim 1, wherein:

said medium is a balanced medium; and

said transmitter further includes a balancing circuit for coupling a signal from said filter onto the medium selected, said balancing circuit ensuring signal balance on two wire portions of said medium selected, promoting good signal quality and reducing radiated emissions.

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

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

5. An extremely high speed transmission link system according to claim 1, further comprising a concentrator platform including at least one channel, media dependent modules and slots connected to said at least one channel for receiving said media dependent modules, said media dependent modules connecting one of fiber optic medium or said selected medium to slots of said concentrator.

6. An extremely high speed transmission link system according to claim 5, wherein said concentrator platform includes signal channels connected to said modules and control means for controlling connections between said modules.

7. An extremely high speed network, comprising:

a concentrator platform having at least one Fiber Distributed Data Interface (FDDI) channel;

a plurality of high speed transmission links connected to said at least one FDDI channel of said concentrator, at least one of said high speed transmission links comprising a medium selected from twisted pair, shielded twisted pair and coaxial cable said medium having frequency domain characteristics which distort fiber optic data interface signals and render said fiber optic data interface signals substantially unrecognizable;

a transmitter connected to said at least one high speed transmission link and including conversion means for receiving fiber optic data interface signals intended to drive a fiber optic data interface, said conversion means also being for converting said fiber optic data interface signals into high speed transmission link signals operating at rates up to 125 megabauds provided in a form suitable to drive said medium selected and overcome said frequency domain characteristics which distort said fiber optic data interface signals and render said fiber optic data interface signals substantially unrecognizable; and

a receiver connected to said at least one high speed transmission link including reconversion means for regenerating the signal received from said medium selected back to an adequate signal level.

8. An extremely high speed transmission link system according to claim 7 wherein said conversion means includes a buffer receiving said fiber optic data interface signals and for forming said high speed transmission link signal via an equalizer and a filter, said equalizer providing frequency domain compensation to said high speed transmission link signal for the characteristics of the medium selected, said filter rejecting signals outside a band of data signaling to said high speed transmission link signal.

9. An extremely high sped transmission link system according to claim 7, wherein:

said medium is a balanced medium; and

said transmitter further includes a balancing circuit for coupling a signal from said filter onto the medium selected, said balancing circuit ensuring signal balance on two wire portions of said medium selected, promoting good signal quality and reducing radiated emissions.

10. An extremely high speed transmission link system according to claim 7, wherein said receiver reconversion means includes a filter connected to said selected medium to reject signals outside a band of data signaling and to limit radiated emissions and a buffer for regenerating a signal received from said filter of said receiver back to an adequate signal level.

11. A Fiber Distributed Data Interface (FDDI) transmission link system comprising:

a medium transferring signals from one end of said medium to another end of said medium, said medium having frequency domain characteristics which attenuate specific frequencies of FDDI transmission line signals and render said FDDI transmission line signals substantially unrecognizable;

a transmitter connected to said one end of said medium, said transmitter including a buffer means for receiving data intended to be transmitted over an FDDI transmission link as said FDDI transmission line signals, and for converting said data into medium transferrable FDDI signals, said transmitter including equalizer means for providing said medium transferable FDDI signals with frequency domain compensation for counteracting said frequency domain characteristics of said medium in order to render said medium transferrable signals recognizable after being transferred from said one end of said medium to said other end, said equalizer means providing said frequency domain compensation dependent on said frequency characteristics of said medium which distorts said FDDI transmission line signals; and

a receiver connected to said another end of said medium, said receiver including reconversion means for receiving said medium transferrable FDDI signals from said medium and regenerating said data from said medium transferrable FDDI signals.

12. An extremely high speed transmission link system according to claim 11, wherein said receiver reconversion means includes a filter connected to said selected medium to reject signals outside a band of data signaling and to limit radiated emissions and a buffer for regenerating a signal received from said filter of said receiver back to an adequate signal level.

13. An extremely high speed transmission link system according to claim 11, wherein said receiver includes signal detect circuit means for distinguishing between the presence and absence of an input signal.

14. An extremely high speed transmission link system according to claim 11, further comprising a concentrator platform including at least one channel and slots connected to said at least one channel, media dependent modules for receiving said media dependent modules, one of said media dependent modules connecting said medium to said slots of said concentrator.

15. An extremely high speed transmission link system according to claim 14, wherein said concentrator platform includes signal channels connected to said modules and control means for controlling connections between said modules.

16. An extremely high speed transmission link system according to claim 14, wherein said concentrator platform includes power supply means for supplying power to installed modules.

17. A system in accordance with claim 11, further comprising;

a plurality of electrically conductive media, each of said plurality of media having a corresponding transmitter and receiver, each of said corresponding transmitters having buffer means, equalizer means and filter means, said equalizer means of each of said transmitters providing frequency domain compensation depending on frequency domain characteristics of said corresponding medium; and

a concentrator platform connected to one of said transmitters and receivers which correspond to said each of said plurality of media, said concentrator platform including signal channel means for transferring said data between said transmitters and receivers connected to said concentrator platform, said concentrator platform also including control means for establishing an FDDI Local Area Network (LAN) defined by ANSI X3T9.5 standard between said transmitters and receivers connected to said concentrator platform.

18. A Fiber Distributed Data Interface (FDDI) transmission link system comprising:

a medium transferring signals from one end of said medium to another end of said medium, said medium having frequency domain characteristics which distort FDDI transmission line signals and render said FDDI transmission line signals substantially unrecognizable;

a transmitter connected to said one end of said medium, said transmitter including a conversion means for receiving data intended to be transmitted over an FDDI transmission link as said FDDI transmission line signals, said conversion means being also for converting said data into medium transferrable FDDI signals and providing said medium transferable FDDI signals with frequency domain compensation for counteracting said frequency domain characteristics of said medium in order to render said medium transferrable signals recognizable after being transferred from said one end of said medium to said other end, said conversion means providing said frequency domain compensation dependent on said frequency characteristics of said medium which distorts said FDDI transmission line signals; and

a receiver connected to said another end of said medium, said receiver including reconversion means for receiving said medium transferable FDDI signals from said medium and regenerating said data from said medium transferrable FDDI signals.