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PM73121 Datasheet(PDF) 39 Page - PMC-Sierra, Inc |
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PM73121 Datasheet(HTML) 39 Page - PMC-Sierra, Inc |
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39 / 223 page  PM73121 AAL1gator II PMC-Sierra, Inc. PMC-980620 ,VVXH AAL1 SAR Processor Data Sheet QSPQSD@U6S`Ã6I9Ã8PIAD9@IUD6GÃUPÃQH8TD@SS6ÃDI8Ã6I9ÃAPSÃDUTÃ8VTUPH@ST¶ÃDIU@SI6GÃVT@ • Each AAL1 cell is either 46 or 47 bytes, depending upon whether or not the cell contains a structure pointer. 2.8.2 Peak Cell Rates (PCRs) for Unstructured Cell Formats • PCR ≤ 4,107 cells per second for T1 (assuming 47 bytes for each AAL1 cell). • PCR ≤ 5,447 cells per second for E1 (assuming 47 bytes for each AAL1 cell). • PCR ≤ 118,980 cells per second for T3 (assuming 47 bytes for each AAL1 cell). • PCR ≤ 91,405 cells per second for E3 (assuming 47 bytes for each AAL1 cell). • If all lines are at the same rate, the aggregate PCR ≤ 53,191 cells per second for multiple-line unstructured data format (assuming 47 bytes for each AAL1 cell). If all lines are not at the same rate, the aggregate PCR ≤ 46,542. • PCR ≤ 1,000 cells per second for OAM cells. This rate of OAM cells is calculated on the basis of up to four cells per second per VC. Transmitting and receiving OAM cells at this rate consumes 20% of the microprocessor accesses. 2.8.3 Peak Cell Rates and Partial Cells Partial Cells can be used to minimize the amount of delay required to assemble a cell. However, the amount of overhead required for the same amount of TDM data increases when partial cells are used. This overhead increases as the number of data bytes per cell decreases. The following equations can be used to determine the PCR when partial cells are used. First, the maximum average cell generation time (MACGT) is calculated. The MACGT value is equal to the maximum average number of cycles to generate a cell, times the length of the clock cycle. Second, the maximum average cell generation time is multiplied by the number of cells required per second to give the total cell generation time (TCGT). The following equations are given for different modes of operation. Each equation is calculated on a per-queue basis. If all the queues are configured the same, then the total for a queue can be multiplied by the number of queues. Otherwise, the sum of the calculations for each queue needs to be totaled. The sum must be less than one. The following variables are used: K = # of data bytes per cell N = number of timeslots assigned to queue L = length of clock cycle NOTE: If OAM cells are used, add the following equation for the OAM cells: TCGTOAM = 212 × L × (maximum number of OAM cells per second) |
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