DOCSIS 3.1 Caribbean Cable （DOCSIS 3.1加勒比电缆）.pdf

DOCSIS 3.1: WHAT IS IT, HOW DOES IT WORK, AND HOW CAN YOU PREPARE FOR IT? Daniel Howard, SCTE CTO July 16, 2013 VIDEO PART 1: OFDM BUSINESS DRIVERS  MAIN OBJECTIVES: As we go through Part 1 of today’s lecture, you should be able to answer the following questions: • What are the options in multiplexing todays data signals to the customer? • What are the business, market and technology drivers for OFDM in cable? • Why move beyond QAM 256? • What are the options for higher order modulation? • How will DOCSIS 3.1 with OFDM enable operators to deliver higher speed data services and increase the capacity of their HFC access networks? • What makes OFDM especially well suited to deliver wider effective channels? BUSINESS DRIVERS FOR OFDM ON HFC In a phrase: MORE HFC CAPACITY IS NEEDED!  Market drivers: Business services, Over The Top (OTT) video, 4K video, 3DTV, etc.  Economic drivers: Decrease cost per bit transmitted  How much capacity do we need? – 10 Gb/s downstream or greater – 1 Gb/s upstream or greater  Flexibility requirement: Need easy adaptation to different amounts of spectrum and plant conditions HOW TO GET MORE CAPACITY?  Higher orders of modulation (HOM) 256-QAM 4096-QAM  Elimination/reduction of RF guard bands  Greater capacity achieved primarily through LDPC (HOM in clean channel) and OFDM (elimination of guard bands and HOM in impaired channels)  Close to 2x improvement over DOCSIS 3.0 A N D O A W P