Electrical computers and digital processing systems: multicomput – Computer-to-computer data routing
Reexamination Certificate
2006-03-14
2006-03-14
Jaroenchonwanit, Bunjob (Department: 2143)
Electrical computers and digital processing systems: multicomput
Computer-to-computer data routing
C370S542000
Reexamination Certificate
active
07013348
ABSTRACT:
The invention concerns a switching apparatus comprising a low order switch subtended from a high order switch. In order to compensate for delays incurred by passing a data frame through the high order switch to the low order switch and delays incurred by the operation of the low order switch, the apparatus is arranged to advance the payload of a received data frame with respect to the fixed overhead of the data frame by an amount corresponding to the incurred delays. The low order switch uses the advanced payload to create an output frame, for sending to the high order switch, which is advanced with respect to the data frame that it receives. The apparatus, which is particularly suitable for use in SDH and/or SONET systems, obviates the need to provide an alignment apparatus, such as a VT/TU aligner between the high order switch and the subtended low order switch.
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Carson Mark
Goodman David M.
Barnes & Thornburg LLP
Jaroenchonwanit Bunjob
Nortel Networks Limited
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