H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/56 (2006.01) G06F 7/52 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 2164792
A method of scheduling cell transmission over an asynchronous transfer mode communication channel. The channel has a characteristic transmission rate that is related to the system clock frequency ? and an allowed cell rate ACR expressed as a floating point number having a mantissa m, and an exponent e, where 0m 511, 0e31 and ACR=(1+m/512)*2e. If m128 then the reciprocal of the mantissa portion (1+m/512) is evaluated by piece-wise linear approximation of the function: Image Otherwise, if m < 128 then the reciprocal of the mantissa portion is evaluated by piece-wise linear approximation of the function: Image A selected cell is then scheduled for transmission at a time T relative to the transmission time T0 of a cell transmitted immediately prior to the selected cell, where T = T0 + (ACR-1)*f. A hardware embodiment of the invention, requiring only one 9-bit two's complementer, three 11-bit adders, and glue logic for multiplexing/control is easily implemented using VLSI circuitry in compliance with ATM Forum traffic management standards, without resort to hardware division or multiplication.
Dabecki Stephen Julien
Radhakrishnan Sivakumar
Oyen Wiggs Green & Mutala Llp
Pmc-Sierra Ltd.
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