Multiport repeater

• US 4,825,435 A
• Filed: 11/08/1985
• Issued: 04/25/1989
• Est. Priority Date: 11/08/1985
• Status: Expired due to Term

• Current Assignee: Enterasys Networks Incorporated (Extreme Networks, Inc.)
• Original Assignee: Digital Equipment Corporation (HP Inc.)
• Inventors: Friess, Richard C., Zink, Barry C., Sooza, Robert J., Amundsen, Keith B., Evans, Richard P.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Chin, Wellington
• Application Number:
  US06/796,470
• Time in Patent Office: 1,264 Days
• Field of Search: 370/85, 370/86, 370/94, 370/55, 370/88, 370/97, 370/31, 375/3, 375/4, 455/7, 455/14, 455/15, 455/16
• US Class Current: 370/501
• CPC Class Codes: H04L 12/44 Star or tree networks
• CPC Class Codes: Y10S 370/908 Local area network

Abstract

A multiport repeater "Hub" for interconnecting a plurality of transceiver cables to a local area network transceiver port. The hub also has an external bus which can be employed for daisy chaining up to a total of eight Hubs as a single connection to the transceiver port.

Claims

1. A method for transmitting a packet of information including a preamble and data throughout a local area network comprising a multiport repeater having a plurality of ports for respectively connecting an end of each of a plurality of coaxial cables to said repeater, a port for connecting a transceiver cable to said repeater, FIFO buffer means, and repeating means, comprising the steps of:

(a) storing information received on one of said ports in said FIFO buffer means;

(b) regenerating a preamble in response to storage of said received information and transmitting said regenerated preamble on all of said ports except for said one port;

(c) detecting an end of said received preamble at the output of said buffer means and;

(d) always replicating the information stored in said buffer on all of said ports except for said one port in response to completion of said regenerated preamble.

2. The method as defined in claim 1, further comprising the step of delaying the output of the data in said buffer in response to detection of said end of preamble prior to completion of said regenerated preamble.

3. A method for transmitting received data throughout a local area network comprising a multiport repeater having a plurality of ports for respectively connecting an end of each of a plurality of coaxial cables to said repeater, a port for connecting a transceiver cable to said repeater, FIFO buffer means, and repeating means, comprising the steps of:

(a) storing data received on one of said ports in said FIFO buffer means;

(b) always replicating the data stored in said buffer means on all of said ports except for said one port.

4. A local area network comprising first, second and third multiport repeaters, each multiport repeater having a repeater interconnect port, a plurality of local ports and repeating means for coupling all data received at one port of said repeater for transmission at all other ports of said repeater, first, second and third pluralities of signal connection means coupled to said pluralities of local ports of said first, second and third multiport repeaters respectively, first, second and third repeater interconnection means coupled to said repeater interconnect ports of said first, second and third multiport repeaters respectively, and a repeater interconnect bus means connected to each of said repeater interconnection means at different junctions therealong, whereby data transmitted by a device coupled to any one of said signal connection means is received by all other devices coupled to said pluralities of signal connection means.

5. The local area network as defined in claim 4, wherein each of said multiport repeaters further comprises restoring means for restoring timing margins in said repeated data and regenerating means for regenerating a preamble.

6. The local area network as defined in claim 4, further comprising a transceiver and transceiver connection means, wherein said first multiport repeater further comprises a transceiver connection port, said transceiver being connected to said transceiver connection port by way of said transceiver connection means.

7. The local area network as defined in claim 4, wherein said restoring means comprises a first-in/first-out buffer means for storing said preamble and said data received at said one port, and means for detecting an end of said received preamble at an output of said buffer means, wherein in response to detection of an end of said received preamble at said buffer means output before completion of said regenerated preamble by said regenerating means, said buffer means delays the output of said received data until said regenerated preamble is completed.

8. A global local area network connected to a standard Ethernet coaxial cable by means of transceiver, said local area network comprising first, second and third multiport repeaters, each multiport repeater having a repeater interconnect port, a plurality of local ports and repeating means for coupling all data received at one port of said repeater for transmission at all other ports of said repeater, first, second and third pluralities of signal connection means coupled to said pluralities of local ports of said first, second and third multiport repeaters respectively, first, second and third repeater interconnection means coupled to said repeater interconnect ports of said first, second and third multiport repeaters respectively, and a repeater interconnect bus means connected to each of said repeater interconnection means at different junctions therealong, said first multiport repeater having a transceiver connection port connected to said transceiver by a transceiver connection means, whereby data transmitted by a device coupled to any one of said signal connection means is received by all other devices coupled to said pluralities of signal connection means, and wherein each of said signal connection means has higher signal attenuation and lower resistance to interference than said standard Ethernet coaxial cable.

9. The local area network as defined in claim 8, wherein each of said multiport repeaters further comprises restoring means for restoring timing margins in said repeated data and regenerating means for regenerating a preamble.