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SP-RFI-I03-980202 Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers |
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SP-RFI-I03-980202 Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers |
3 / 200 page iii Radio Frequency Interface Specification SP-RFI-I03-980202 Contents 1 SCOPE AND PURPOSE................................................................................................................................1 1.1 SCOPE.........................................................................................................................................................1 1.2 REQUIREMENTS..........................................................................................................................................1 1.3 BACKGROUND ............................................................................................................................................1 1.3.1 Service Goals......................................................................................................................................1 1.3.2 Reference Architecture.......................................................................................................................2 1.3.3 Server Location ..................................................................................................................................5 2 FUNCTIONAL ASSUMPTIONS .................................................................................................................7 2.1 BROADBAND ACCESS NETWORK ...............................................................................................................7 2.2 EQUIPMENT ASSUMPTIONS ........................................................................................................................7 2.2.1 Frequency Plan ..................................................................................................................................7 2.2.2 Compatibility with Other Services .....................................................................................................7 2.2.3 Fault Isolation Impact on Other Users ..............................................................................................7 2.3 RF CHANNEL ASSUMPTIONS......................................................................................................................8 2.3.1 Transmission Downstream.................................................................................................................8 2.3.2 Transmission Upstream......................................................................................................................9 2.4 TRANSMISSION LEVELS..............................................................................................................................9 2.5 FREQUENCY INVERSION ...........................................................................................................................10 3 COMMUNICATION PROTOCOLS .........................................................................................................11 3.1 PROTOCOL STACK....................................................................................................................................11 3.1.1 CM and CMTS as Hosts ...................................................................................................................11 3.1.2 Data Forwarding Through the CM and CMTS................................................................................12 3.2 THE MAC FORWARDER...........................................................................................................................15 3.2.1 Example Rules for Data-Link-Layer Forwarding............................................................................15 3.3 NETWORK LAYER ....................................................................................................................................16 3.4 ABOVE THE NETWORK LAYER.................................................................................................................16 3.5 DATA LINK LAYER ..................................................................................................................................17 3.5.1 LLC Sublayer....................................................................................................................................17 3.5.2 Link-Layer Security Sublayer...........................................................................................................17 3.5.3 MAC Sublayer ..................................................................................................................................17 3.6 PHYSICAL LAYER.....................................................................................................................................18 3.6.1 Downstream Transmission Convergence Sublayer..........................................................................18 3.6.2 PMD Sublayer ..................................................................................................................................18 4 PHYSICAL MEDIA DEPENDENT SUBLAYER SPECIFICATION....................................................21 4.1 SCOPE.......................................................................................................................................................21 4.2 UPSTREAM ...............................................................................................................................................21 4.2.1 Overview...........................................................................................................................................21 4.2.2 Modulation Formats.........................................................................................................................22 4.2.3 FEC Encode .....................................................................................................................................25 |
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