lmds無線接入技術(shù)ppt課件(存儲(chǔ)版)
【正文】 MAC HIGH LAYER AAL5 AAL5 ATM ATM TC LAYER PMD LAYER LAYER MANAGEMENT 14 MPEGTS PACKET FORMAT SYNC 1 byte PAYLOAD 187 byte 15 PACKET FORMAT FOR TRAINSMITING ATM CELL SYNC 1 byte PAYLOAD 187 byte SYNC 1 byte CTRL 0 1 byte Frame start cell 1 53 bytes ATM cell 2 53 bytes ATM cell 3 53 bytes ATM cell 4 (part) 27 bytes CTRL 1 1 byte ATM cell 4 (cont) 26 bytes ATM cell 5 53 bytes ATM cell 6 53 bytes ATM cell 7 53 bytes CTRL 2 1 byte Packet 0 Packet 1 Packet 0 Packet 1 PAYLOAD 187 byte 16 Example Downstream/Upstream Framing Relationship (ATM Case) QPSK Modulation Do w n s tr e a m U p s tr e a mF r a m
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