(12) United States Patent ao) Patent No.: us 6,850,520 Bi
Takada et al. (45) Date of Patent: *Feb. 1,2005
(54) ATM LAYER CELL PROCESSING APPARATUS
(75) Inventors: Shuji Takada, Kawasaki (JP);
Yasuhiro Ooba, Kawasaki (JP)
(73) Assignee: Fujitsu Limited, Kawasaki (JP)
( * ) Notice: Subject to any disclaimer, the term ol this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
This patent is subject to a terminal disclaimer.
(21) Appl. No.: 09/409,145
(22) Filed: Sep. 30, 1999
(30) Foreign Application Priority Data
Nov. 4, 1998 (JP) 10-312787
(51) Int. CI.7 H04L 12/28
(52) U.S. CI 370/389; 370/395.1
(58) Field of Search 370/241.1, 236.1,
370/236.2, 395, 395.1, 395.6, 389
(56) References Cited
U.S. PATENT DOCUMENTS
5,659,540 A * 8/1997 Chen et al 370/249
An ATM layer cell processing apparatus is provided with a plurality ol cell processing sections, including a plurality ol OAM cell processors provided with respect to each ol OAM cell types, a cell identilying section outputting cell type information by decoding header information ol an arrived cell, an OAM identilying section outputting OAM identification information including OAM type information identified based on OAM cell information ol a payload and the cell type information, where the cell identilying section and the OAM identilying section are provided in common with respect to the plurality ol cell processing sections including the plurality ol OAM cell processors, and a mechanism sending the OAM ell type information and cell data ol the arrived cell to a cell processing section which is to process the arrived cell at a subsequent stage, based on the OAM identification information output from the OAM identification section.
18 Claims, 15 Drawing Sheets