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TP3410J Arkusz danych(PDF) 6 Page - National Semiconductor (TI) |
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TP3410J Arkusz danych(HTML) 6 Page - National Semiconductor (TI) |
6 / 32 page Functional Description (Continued) Framing 12x(2BaD) Overhead Bits (M1–M6) Quat Positions 1 – 9 10 – 117 118s 118m 119s 119m 120s 120m Bit Positions 1 – 18 19 – 234 235 236 237 238 239 240 Superframe Basic Frame Sync Word 2BaDM1 M2 M3 M4 M5 M6 1 1 ISW 2BaD eoca1 eoca2 eoca3 act 1 1 2SW 2BaD eocdm eoci1 eoci2 dea 1 febe 3SW 2BaD eoci3 eoci4 eoci5 1 crc1 crc2 4SW 2BaD eoci6 eoci7 eoci8 1 crc3 crc4 5SW 2BaD eoca1 eoca2 eoca3 1 crc5 crc6 6SW 2BaD eocdm eoci1 eoci2 1 crc7 crc8 7SW 2BaD eoci3 eoci4 eoci5 uoa crc9 crc10 8SW 2BaD eoci6 eoci7 eoci8 aib crc11 crc12 2 3 1 ISW (a) Network x NT Framing 12x(2BaD) Overhead Bits (M1–M6) Quat Positions 1 – 9 10 – 117 118s 118m 119s 119m 120s 120m Bit Positions 1 – 18 19 – 234 235 236 237 238 239 240 Superframe Basic Frame Sync Word 2BaDM1 M2 M3 M4 M5 M6 1 1 ISW 2BaD eoca1 eoca2 eoca3 act 1 1 2SW 2BaD eocdm eoci1 eoci2 ps1 1 febe 3SW 2BaD eoci3 eoci4 eoci5 ps2 crc1 crc2 4SW 2BaD eoci6 eoci7 eoci8 ntm crc3 crc4 5SW 2BaD eoca1 eoca2 eoca3 cso crc5 crc6 6SW 2BaD eocdm eoci1 eoci2 1 crc7 crc8 7SW 2BaD eoci3 eoci4 eoci5 1 crc9 crc10 8SW 2BaD eoci6 eoci7 eoci8 1 crc11 crc12 2 3 1 ISW (b) NT x Network Note 8 c 15 ms Basic Frames e 12 msSuperframe NT-to-Network superframe is offset from Network-to-NT superframe by 60g2 quats (about 075 ms) All bits other than the Sync Word are scrambled Symbols Abbreviations act e start-up bit (e 1 during start-up) aib e alarm indication bit (e 0 to indicate interrup- tion) crc e cyclic redundacy check covers 2BaD a M4 1 e most significant bit 2 e next significant bit etc cso e cold-start-only bit (e 1 to indicate cold-start- only) dea e turn off bit (e 0 to announce turn off) eoc e embedded operations channel a e address bits dm e datamessage indicator (0 e data 1 e message) i e information (data or message) febe e far end block error bit (e 0 for errored super- frame) ntm e NT in test mode bit (e 0 to indicate test mode) ps1 ps2 e power status bits (e 0 to indicate power prob- lems) Quat e pair of bits forming quaternary symbol s e sign bit (first in quat) m e magnitude bit (second in quat) sai e S-activation-indication bit (e 1 for ST activity) uoa e U-only-activation bit (e 1 to activate ST) ‘‘1’’ e reserved bit for future standard (e 1) ‘‘1 ’’ e network indicator bit (e 1 reserved for network use) 2BaD e user data bits 19 – 234 in frame M e M-channel bits 235 – 240 in frame SWISW e synchronization wordinverted synchronization word bits 1 – 18 in frame TABLE I 2B1Q Superframe Format and Overhead Bit Assignments 6 |
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