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TE3-MUX Datasheet(PDF) 43 Page - Infineon Technologies AG |
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TE3-MUX Datasheet(HTML) 43 Page - Infineon Technologies AG |
43 / 211 page PEB 3445 E Functional Description Data Sheet 43 2001-06-29 4.4.2 ITU-T G.747 format The multiplexing frame structure is shown in Table 2. Table 2 ITU-T G.747 format 4.4.2.1 Synchronization Procedure The integrated framer searches for the frame alignment pattern ’111010000’ in each of the seven DS2 frames which are contained in a DS3 signal. Frame alignment is declared, when the framer has found three consecutive correct frame alignment signals. If the frame alignment signal has been received incorrectly in one of the following frames after the receiver found the first correct frame alignment signal a new frame search is started. Loss of frame is declared, when four consecutive frame alignment signals have been received incorrectly. 4.4.2.2 Multiplexer/Demultiplexer Demultiplexer The demultiplexer extracts three E1 signals from each 6.312 MHz signal. If two out of three bits of Cj1, Cj2, Cj3 are set to ’1’ the available justification bit of the j th E1 signal is discarded. Set Content Bit ITU-T G.747 Frame I Frame Alignment Signal 111010000 1 to 9 Bits from tributaries 10 to 168 II Alarm indication to the remote multiplex equipment 1 Parity Bit 2 Reserved 3 Bits from tributaries 4 to 168 III Justification control bits Cj1 1 to 3 Bits from tributaries 4 to 168 IV Justification control bits Cj2 1 to 3 Bits from tributaries 4 to 168 V Justification control bits Cj3 1 to 3 Bits from tributaries available for justification 4 to 6 Bits from tributaries 7 to 168 |
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