公开(公告)号：DE69117106T2

公开(公告)日：1996-10-17

申请号：DE69117106

申请日：1991-06-17

Applicant: IBM

Inventor： FRENZEL JAMES FAILEY ,  YOUNGMAN BRIAN ALAN

IPC: H04L12/437 ,  H04L12/42

Abstract: Described is an improved method and apparatus which allows graceful insertion/de-insertion of a station into an FDDI network. A 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 device thus joining it to the FDDI network. A scrubber circuit simultaneously removes the void frames and issues idle signals on the FDDI network.

公开(公告)号：DE69117106D1

公开(公告)日：1996-03-28

申请号：DE69117106

申请日：1991-06-17

Applicant: IBM

Inventor： FRENZEL JAMES FAILEY ,  YOUNGMAN BRIAN ALAN

IPC: H04L12/437 ,  H04L12/42

Abstract: Described is an improved method and apparatus which allows graceful insertion/de-insertion of a station into an FDDI network. A 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 device thus joining it to the FDDI network. A scrubber circuit simultaneously removes the void frames and issues idle signals on the FDDI network.