Method and apparatus for transmitting information via a bus system

Patent 4821263 Issued on April 11, 1989. Estimated Expiration Date:

February 25, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Bus system with address and status conductors
Patent #: 4426697
Issued on: 01/17/1984
Inventor: Petersen , et al.

System for exchanging encoded messages between stations
Patent #: 4580261
Issued on: 04/01/1986
Inventor: Pelotte

Access control for a plurality of modules to a common bus
Patent #: 4652873
Issued on: 03/24/1987
Inventor: Dolsen , et al.

Collision avoidance in a multinode data communication network Patent #: 4755990
Issued on: 07/05/1988
Inventor: Bohler , et al.

Inventor

Lundh, Peter C. B.

Assignee

Telefonaktiebolaget LM Ericsson

Application

No. 07/160255 filed on 02/25/1988

US Classes:

370/423, Including a bus for interconnecting inputs and outputs370/438, Using a separate control line or bus for access control370/445Carrier sense multiple access (CSMA)

Examiners

Primary: Olms, Douglas W.
Assistant: Marcelo, Melvin

Attorney, Agent or Firm

Burns, Doane, Swecker & Mathis

International Class

H04L 12/56 (20060101)

Foreign Application Priority Data

1987-02-27 SE

Abstract

A method and apparatus for transmitting message information between a plurality of transmission units includes a plurality of data transmission channels on a bus system which are each permanently assigned to a respective transmission unit and adapted to transmit message information only to the transmission unit to which it is assigned from any one of the other transmisstion units. In addition, a plurality of status transmission channels on the bus system are each assigned to one of the transmission units and adapted to transmit status information from any one of the transmission units. This status information indicates whether the data transmission channel assigned to the same transmission unit as the respective status transmission channel is engaged or unoccupied for transmitting message information. The method and apparatus are particularly suited for switching nodes in packet-switched communications.