Reference Point 3 Specification - OBSAI - OBSAI

Reference Point 3 Specification Version Reference Point 3 Specification Issue Copyright 2010, OBSAI . All Rights Reserved. 2 (149) Contents 1 Summary of Changes .. 13 2 Scope .. 15 3 Reference Point 3 Architecture .. 16 Parameter Definitions .. 16 Module Interface Toward RP3 .. 17 Topology .. 18 Mesh .. 18 Centralized Combiner and Distributor .. 20 Inter-Cabinet Connections .. 22 Inter-Cabinet Mesh .. 22 Connections between Bridge Modules .. 23 Connections between Combiner and Distributor Modules .. 24 4 Protocol Stack .. 26 Physical Layer .. 27 Electrical Signalling .. 27 Data Format and Line Coding .. 27 Bus Clock .. 28 Data Link Layer .. 28 Message Overview .. 28 Frame Structure .. 29 Bit Level Scrambling for 6144 Mbps (8x) Line Rate .. 32 Counters .. 35 Transmission of Frame Structure .. 36 Reception of Frame Structure .. 37 Empty Message .. 40 Synchronisation .. 40 Measurements.

Figure 1: RP3 interface of RF and baseband modules. There exists a maximum of K pairs of unidirectional links toward RP3..... 18 Figure 2: Full mesh connecting two baseband and three RF modules.

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