The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 26, 1993
Filed:
Jun. 26, 1990
James F Frenzel, III, Bahama, NC (US);
Brian A Youngman, Cary, NC (US);
International Business Machines Corporation, Armonk, NY (US);
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.