Appeal No. 2000-0372
Application No. 08/421,338
The examiner relies on the following references:
Dujari 4,984,151 Jan. 08, 1991
Stewart EP 500,238 Aug. 26, 1992
Claims 1-4 and 6-10 stand rejected under 35 U.S.C. § 103 as unpatentable over
Stewart in view of Dujari.
Reference is made to the briefs and answer for the respective positions of
appellants and the examiner.
OPINION
Stewart is directed to a header translation unit for an asynchronous transfer mode
[ATM] switching system, similar to appellants’. In Stewart, a content addressable memory
[CAM] is used to effect a mapping function between a plurality of logical addresses and a
plurality of physical addresses. CAM 5 is under the control of control unit 6. When a data
cell is received on line 2, Policing and Header Translation Unit [PHTU] 1 extracts the virtual
path identifier [VPI] and virtual channel identifier [VCI] fields from the ATM cell header.
CAM 5 is then searched for these two fields to see if a match can be found. If matching
values are found, CAM 5 provides an output signal on line 9 corresponding to the physical
address for the particular match for storage in RAM 8. PHTU 1 has the function of
translating the incoming ATM cell data into a form which can be switched by a switch
network
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