Download - Cable Access Developments
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Cable Broadband Access
Developments
Benjamin FuJune 5th, 2014
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Agenda• DOCSIS Recap
• DOCSIS 3.1
• CCAP & Other Fancy Stuff
• Vendor-X’s Strategy
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DOCSIS RecapDOCSIS: Most successful broadband access tech in NA
• DOCSIS 1.0o Started the broadband access era
• DOCSIS 1.1o Sophisticated QoS mechanism enabled IP Voiceo Still the stepping stone for today’s QoSo BPI+, certificate
• DOCSIS 3.0o Channel bondingo IPv6o More security enhancements
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DOCSIS Recap (cont.)DOCSIS 3.0 deployment facts• Actively deployed for 5+ years, fast-growing• Majority offering: 8x4 (DS/US)• Some started 24x8
o 1Gbps downstream / 200Mbps upstream peak rate
DOCSIS 3.0 CPE• Vendors ceased D2.0 in 2012• D3.0 CPE revenue increased by 85% in 2013• 16/24 channel D3.0 CPE started shipping late 2013
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Agenda• DOCSIS Recap
• DOCSIS 3.1
• CCAP & Other Fancy Stuff
• Vendor-X’s Strategy
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DOCSIS 3.1 - Why• EPON/GPON, Google fiber, etc.
• IP Video: YouTube, Netflix, Hulu, emerging 4K video
• Why not just bond more channels?
• Backwards compatibility
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DOCSIS 3.1 - Basics• Goal
o Achieve 10G+ bps in downstream & 2G+ bps in upstreamo Backwards compatible all the way back to DOCSIS 1.1o Spectral efficiency
• Technologyo OFDM, OFDMA, LDPCo Expanded spectrumo Greener
• Competitive with FTTH at much lower cost
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DOCSIS 3.1 - Advantages
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DOCSIS 3.1 - Technologies
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DOCSIS 3.1 - Technologies
• OFDMo No 6 MHz or 8 MHz channel concept any longero DOCSIS 3.1 OFDM downstream channel: 192 MHzo Upstream OFDMA channel bandwidth is 96 MHzo Possible to turn off some subcarriers
• LDPCo Existing for more than 4 decades – high computational complexityo More robust than Reed-Solomon FECo Provides up to 4-5 dB gain compared to RS FEC
• Better modulation and network robustnesso 1024 QAM where 256 QAM was present in SC QAM DS (same RF quality)
• Downstream = 25% increase in bits/Hzo 256 QAM where 64 QAM was present in SC QAM US
• 64 QAM to 256 QAM for Upstream = 33% increase in bits/Hz
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DOCSIS 3.1 – Backwards
Compatibility • Back office
o Only MULPI and PHY spec published, no OSSI yeto Shouldn’t be big change requiring back office upgrade
• DOCSIS 3.1 CPEo Simultaneously support legacy SC-QAM channels and OFDM channelso Possibility of bonding SC-QAM and OFDM
• Upstream spectral multiplexingo Legacy SC-QAM and OFDMA able to be time multiplexed
All for Gradual introduction
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DOCSIS 3.1 – Practical
Concerns• Upstream
o Sub-split, mid-split, high-splito In relatively long period, many MSO will be stuck at 5-42Mhzo Higher-split then 42Mhz
• Diplex filter replacement• Most likely amplifier replacement
o Legacy DTV OOB• Movable above 120Mhz?
o Return laser upgrade – higher order modulation…
• Downstreamo RF plan upgrade: 860Mhz to 1Ghz or even 1.2Ghz planto Very high cost
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Agenda• DOCSIS Recap
• DOCSIS 3.1
• CCAP & Other Fancy Stuff
• Vendor-X’s Strategy
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CCAPConverge Cable Access Platform
• MSO initiated architecture
• Goalso Flexible & dynamic QAM usage, across services (SDV,VoD, DOCSIS,
etc.)o QAM replicationo Simplified RF combiningo Agnostic in either uplink and access technologies (Starting from D3.0)o Modular software architecture
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CCAP (cont.)• CCAP Benefits
o Reduce power and space requirements in Head-endo Optimizing combining network with QAM replicationo Repurpose QAM channels on the fly – No rewiring
• CCAP main playerso Cisco (existing FRGW-10, or NG cBR8)o Arris (E6000)o Casa (C100G, mini CMTS)
• Distributed CCAP?
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Fiber Deep/Remote PHY
I-CMTS
M-CMTS
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Fiber Deep/Remote PHY
Remte-PHY
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C-DOCSIS• C-DOCSIS
o Full feature layer 2 Mini CMTSo OLT mandate as uplink
• Cisco’s version of C-DOCSISo 3G60 basedo PHY on CMC only (long-term goal: remote-PHY)
• Virtualizationo Server based MAC and management o CMTS in the Cloud
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Agenda• DOCSIS Recap
• DOCSIS 3.1
• CCAP & Other Fancy Stuff
• Vendor-X’s Strategy
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Vendor-X Strategy• CMTS/CCAP
o Dominant technology in North America but not Asia/Europeo Is Vendor-X strong in CMTS ?
• Distributed/Remoteo C-DOCSIS – Main drafting member, MA5633o Very strong in EPON/GPONo Porting to broader market?
• DOCSIS 3.1o Sampled back in Oct, 2013o Very strong in CPE, both technology and marketingo CPE, esp. DOCSIS 3.1 CPE (gateway)
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Thank You!
Sources from: CableLabs,
Cisco Live! 2014 presentation, Lightreading.comVendor’s website.
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Backup: OFDM Frequency
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Backup: DS Profiles
• A: Worst o (say, mostly 256-QAM)
• B: Averageo (say, mostly 1024-QAM)
• C: Bettero (say, mostly 2048-QAM)
• D: Besto (say, mostly 4096-QAM)
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Backup: Spectrum Alignment
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Backup: Energy Mangement