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PEB2035 Datasheet(PDF) 33 Page - Siemens Semiconductor Group |
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PEB2035 Datasheet(HTML) 33 Page - Siemens Semiconductor Group |
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33 / 134 page  Semiconductor Group 33 PEB 2035 General Signaling q S a bits in accordance with CCITT Blue Book G.704. q E bits in accordance with CCITT Blue Book G.704. Signaling q CCS For Common Channel Signaling the use of time-slot 16 is recommended. The use of CCS is allowed with both the doubleframe and the CRC-multiframe format. q CAS-CC For Channel Associated Signaling the use of time-slot 16 is recommended. The autonomous CAS multiframe structure is not related to a doubleframe or a CRC-multiframe structure (refer to CCITT G.704). Note: CAS multiframe synchronization and synthesis is not performed by the ACFA. Doubleframe Format The framing structure is defined by the contents of time-slot 0 (refer to table 2). Table 2 Allocation of Bits 1 to 8 of Time-Slot 0 Notes:1. Si bits: reserved for international use. If not used, these bits should be fixed to ’1’. Access to received information via bits RSW.RSIS and RSP.RSIF. Transmission is enabled via bits XSW.XSIS and XSP.XSIF. 2. Fixed to ’1’. Used for synchronization. 3. Remote alarm indication: In undisturbed operation ’0’; in alarm condition ’1’. 4. Sa bits: Reserved for national use. If not used, they should be fixed at ’1’. Access to received information via bits RSW.RY0 … RY4. Transmission is enabled via bits XSW.XY0 … XY4. (*) (*) Note: As a special extension for double frame format, the Sn -bit stack may be used optionally. Bit Alternate Number Frames 12345678 Frame Containing the Frame Alignment Signal Si 0011011 Note 1 Frame Alignment Signal Frame not Containing the Frame Alignment Signal Si 1A Sa4 Sa5 Sa6 Sa7 Sa8 Note 1 Note 2 Note 3 Note 4 |
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