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PM73121 Datasheet(PDF) 49 Page - PMC-Sierra, Inc |
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PM73121 Datasheet(HTML) 49 Page - PMC-Sierra, Inc |
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49 / 223 page  PM73121 AAL1gator II PMC-Sierra, Inc. PMC-980620 ,VVXH AAL1 SAR Processor Data Sheet QSPQSD@U6S`Ã6I9Ã8PIAD9@IUD6GÃUPÃQH8TD@SS6ÃDI8Ã6I9ÃAPSÃDUTÃ8VTUPH@ST¶ÃDIU@SI6GÃVT@ and Figure 21 shows the contents of the transmit signaling buffer for the different signaling modes. 3.1.1 Transmit Conditioning The T_COND_DATA structure allows conditional data to be defined on a per-DS0 basis. The structure T_COND_SIG allows conditioned signaling to be defined on a per-DS0 basis. The TX_ COND bit in the T_QUEUE_TBL allows the cell building logic (described in section 3.3 “Trans- mit Adaptation Layer Processor (TALP)” on page 38) to be directed to build cells from the condi- tioned data and signaling. The TX_COND bit can be set on a per-queue basis. 3.1.2 Transmit Signaling Freezing Signaling freezing is a required function when transporting CAS. This function holds the signal- ing unchanged when the incoming line fails. The PMC-Sierra framers provide this function. If a framer is used that does not support signaling freezing, this function must be provided externally. 3.1.3 SRTS for the Transmit Side NOTE: The AAL1gator II uses Bellcore’s patented SRTS clock recovery technique. Refer to the NOTE on page 172 for additional information regarding Bellcore’s SRTS patent. Figure 21. SDF-MF Format of the T_SIGNALING_BUFFER (T1 and E1 Modes) Word 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 15 0 Bit CH1 3 5 7 9 11 13 15 17 19 21 CH0 2 4 6 8 10 12 14 16 18 20 22 NOTE: The upper nibble of each byte is 0. T1 format uses word addresses 0 to 11. CH30 25 24 26 27 28 29 CH31 23 |
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