HFC Cable Architecture
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1 HFC Cable Architecture Wade Holmes 3/22/2018 [all images from CableLabs, Cisco, Arris or otherwise noted]
2 Agenda Overview of Cable as a technology: what the future holds Architecture overview and terminology The PHY layer Hybrid Fiber Coaxial (HFC) system Spectrum allocation, division, FDD The MAC layer DOCSIS, symbols, modulation CPE Products, speeds, performance in practice Operations and Maintenance
3 Cable is generally not a popular topic..
4 Why Cable matters (even if we don t like it) HFC can deliver speeds in excess of 10gb/s on existing infrastructure Franchise agreements in place, power, right of way, fiber-deep
5 Version and speed evolution
6 Future of Cable broadband is bright DOCSIS 3.1 in early phases with year useful life in current form Full duplex DOCSIS emerging (FDX) which allows for 10gb symmetric Fiber-deep architecture enables FTTH and node+0 technology OFDM/OFDMA allows for highly efficient use of spectrum LDCP replaces FEC in 3.1, adding efficiency LTE can run over HFC, and it is headed that way with FDX DOCSIS has been used over unlicensed wireless to add robustness
7 Terminology and Equipment CMTS: Cable Modem Termination System DOCSIS: Data over cable system interface standard Cable Modem: Customer premise cable termination device Node: a passive (but powered) optical to radio frequency transceiver HFC: Hybrid fiber coaxial: a blend of optical and RF for distribution Amplifier: a passive device to perform non-linear RF amplification Spectrum: the RF band from 0-1.2GHz (typical) used in Cable SC-QAM: single-channel QAM, normally 6.0 MHz (DS), 6.4 MHz (US) Node+: Number of nodes in cascade Upstream / Downstream: direction of RF amplification and data flow
8 Simplistic view of DOCSIS Network
9 Basics of Cable Network IP Core IP Edge
10 The HFC Reference Architecture
11 DOCSIS requires 4 management areas CMTS Spectrum Plant Customer
12 Roles in a Cable network RF Engineer Network Engineer Headend Tech Maintenance Tech Field Tech OSS Solution Engineer BSS Integration Customer Support (inside tech)
13 Cable Modem Termination System (i-ccap) Cisco cbr8 Arris E6000
14 Remote PHY
15 Sample Output on CMTS Upstream Service Group Router# show cable mac-domain cable 7/1/0 upstream-service-group Cable MD 7/1/0 US-SG-ID : 1 US-Chan : U0,1,2,3,4 Primary-DS: 5/1/0:0 US-SG-ID: 1 MDD US-List : U0,1,2,3 MDD Ambiguity : U0,1,2,3 Primary-DS: 3/0/0:0 US-SG-ID: 1 MDD US-List : U0,1,2,3,4 MDD Ambiguity : U0,1,2,3,4 Primary-DS: 3/0/0:1 US-SG-ID: 1 MDD US-List : U0,1,2,3,4 MDD Ambiguity : U0,1,2,3,4 Primary-DS: 3/0/0:2 US-SG-ID: 1 MDD US-List : U0,1,2,3,4 MDD Ambiguity : U0,1,2,3,4 Primary-DS: 3/0/0:3 US-SG-ID: 1 MDD US-List : U0,1,2,3,4 MDD Ambiguity : U0,1,2,3,4 Downstream Service Group router#show cable mac-domain cable 7/0/0 rcc 5 simplified RCC ID : 5 Created Via : Wideband - Wi7/0/0:1 CM attribute mask : 0x Primary Receive Channel List: Chan Idx RF Chan DCID Freq 1 In7/0/0: Non-Primary Receive Channel List: Chan Idx RF Chan DCID Freq 2 In7/0/0: In7/0/0: In7/0/0: In7/0/0: In7/0/0: In7/0/0: In7/0/0: OFDM Receive Channel List: Chan Idx RF Chan DCID PLC-Freq Profiles 25 In7/0/0:
16 Return and Forward split at 42, 85 or 200MHz
17 Spectrum Allocation, Channels, Noise Upstream, single 6.4Mhz carrier Downstream, single 6.0Mhz carrier
18 Outside Plant
19 License ($) Capacity Relationship with Modulation (H) and Spectrum (V) (Gb/s) 256 -QAM 5.33 b/hz 512-QAM 5.63 b/hz 1024-QAM 6.39 b/hz 2048-QAM 6.99 b/hz 4096-QAM 7.60 b/hz 8192-QAM 8.20 b/hz Mhz EIA Maintenance and Process (db) Capital ($) Effort and cost increase with higher modulation
20 Plant Peformance
21 Physical Layer
22 Two-Way Plant, commonly a service group Downstream (Forward) Upstream (Return) Graphic adapted from: Kevin Keaner, Aurora Networks
23 Another view of HFC Graphic: Kevin Keaner, Aurora Networks
24 CPE Options Bridge Gateway
25 DOCSIS Frame (w/ LDPC)
26 Other Notes Plant power for nodes and amplifiers is 90v, field supplied Leakage, flyover, sweeps Unity Gain and RF maintenance PNM RDK, areas of industry leadership
27 Excellent Resources Return Path Optimization from Aurora CableLabs Arris and Cisco, largest CMTS manufacturers SCTE Society of Cable and Telecommunications Engineers Spectral Efficiency of DOCIS 3.1
28 Distributed Port Design Fusion Spliced Ports OLT port per 64 HP OLT Ports 9-16 Ports Ports Ports Port Access Port Distribution Ports Ports Ports 53-64
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