Method for controlling the insertion of stations into FDDI netwo

Details Method for controlling the insertion of stations into FDDI netwo Method for controlling the insertion of stations into FDDI netwo

1990-06-26

1993-01-26

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

370 854, 370 8515, 34082505, H04J 316

Patent

active

051827476

ABSTRACT:
Described is an improved method and apparatus which allows graceful insertion/de-insertion of a station into an FDDI network. The circuit arrangement known as "Roving MAC" captures a local token which is circulating on a local loop established between the Roving MAC and the station. The "Roving MAC" issues void frames while holding the local token. A circuit arrangement monitors the FDDI network. If the token on the FDDI network is sensed before the local token is released, a data frame is allowed to pass through, but the token concatenated to the data frame is switched into the station thus joining it to the FDDI network. A scrubber circuit simultaneously removes the void frames and issues idle signals on the FDDI network.

REFERENCES:
patent: 4454508 (1984-06-01), Grow
patent: 4596982 (1986-06-01), Bahr et al.
patent: 4745598 (1988-05-01), Ulug
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patent: 4951280 (1990-08-01), McCool et al.
patent: 4979167 (1990-12-01), McCool
patent: 4998246 (1991-03-01), Tanaka
patent: 5068849 (1991-11-01), Tanaka
Computer Networks and ISDN Systems, vol. 11, No. 2, Feb. 1986 Amsterdam, pp. 121-131.

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