docsis 3.0 overview
DESCRIPTION
DOCSIS 3.0 Overview. SCTE Presentation John J. Downey Cisco Systems – BNE. Agenda. Motivation - Why DOCSIS 3.0? DOCSIS 3.0 Features Overview DOCSIS 3.0 and M-CMTS Comparisons Bandwidth Management Migration Strategy DOCSIS 3.0 Status Potential Issues Summary - PowerPoint PPT PresentationTRANSCRIPT
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 1
DOCSIS 3.0 Overview
SCTE Presentation
John J. Downey
Cisco Systems – BNE
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 2
Agenda
Motivation - Why DOCSIS 3.0?
DOCSIS 3.0 Features Overview
DOCSIS 3.0 and M-CMTS Comparisons
Bandwidth Management
Migration Strategy
DOCSIS 3.0 Status
Potential Issues
Summary
Case Studies/ Architecture Ideas
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 3
Motivation - Why DOCSIS 3.0?
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 4
Growing Services Consuming HFC Spectrum
More HD Video Services– Growth plans to 100+ HD channels
More SD Video Content– Expansion to nx100 SD chs to compete w/ satellite
Personalized Video Services– Migration from Broadcast to Unicast services– VoD, Startover, MyPrimetime, etc
Broadband Internet Services Growth– Migration from Web to Web2.0, Video Streaming and
P2PTV Applications– Increased per home BW consumption– Expansion of the peak hour to whole evening
Competitive pressure!
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 5
Spectral Solutions Being Investigated & Deployed
Use every channel available
SDV
Narrowcast QAM injection
Node splits
Analog reclamation
1 GHz upgrade
Traffic “grooming”
MPEG-4
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 6
Goal:– Increase Scalability– Reduce Cost
Components:– Low Cost E-QAM– CMTS Core Processing
M-CMTS
Overall Industry Objectives
DOCSIS 3.0
Goal:– More aggregate speed– More per-CM speed– Enable New Services
Components:– Channel Bonding– IPv6– Multicast– AES
• Better stat muxing with bigger “pipe”• Offer >37 Mbps for single CM
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 7
DOCSIS 3.0 Features Overview
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 8
• MAC Layer– Downstream Channel Bonding – Upstream Channel Bonding
• Network Layer– IPv6 support– IP Multicast (IGMPv3/MLDv2,
SSM, QoS)
• Security– Certificate Revocation
Management– Runtime SW / Config validation– Enhanced Traffic Encryption
(AES)– Certificate Convergence – Early Authentication &
Encryption– TFTP Proxy
• Network Management– Diagnostic Log (Flaplist)– Extension of Internet Protocol
Data Records (IPDR) usage– Capacity management – Enhanced signal quality
monitoring
• Physical Layer– Switch-able 5-42 MHz, 5-65 MHz,
or 5-85 MHz US band– S-CDMA active code selection
with new Logical channel
• Commercial Services– T1/E1 Circuit Emulation support
DOCSIS 3.0 Features
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 9
Channel Bonding In a nutshell, channel bonding means data is
transmitted to or from CMs using multiple individual RF channels instead of just one channel
Channels aren't physically bonded into a gigantic digitally modulated signal; bonding is logical
With DOCSIS 1.x & 2.0, data is transmitted to modems using one channel
With DOCSIS 3.0, data is transmitted to modems using multiple channels
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 10
DOCSIS 3.0 Registration DiagramWCM acquires QAM/FEC lock of DOCSIS DS channelSYNC, UCD, MAP messages
WCM performs usual US channel selection, but does not start initial rangingMDD message
WCM performs bonded service group selection, and indicates via initial rangingB-INIT-RNG-REQ message
Usual DOCSIS initial ranging sequence
DHCP DISCOVER packet
REG-REQ message
DHCP RESPONSE packet
DHCP REQUEST packet
DHCP OFFER packet
WCM transitions to ranging station maintenance as usual
REG-ACK message
REG-RSP message
Usual BPI init. If configured
TOD Request/Response messages
TFTP Request/Response messagesWCM provides Rx-Chan(s)-Prof
WCM receives Rx-Chan(s)-Config
WCM confirms all Rx Channels
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 11
DOCSIS 3.0 - DS Channel Bonding
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 12
Downstream Bonding - Features
Packet bonding of a minimum of 4 channels– Delivers in excess of 150 Mbps
Non-disruptive technology– Seamless migration from DOCSIS 1.x/2.0
– M-CMTS and high density I-CMTS cards
– EQAMs
New hardware required for scalability and cost reduction
New CM silicon required
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 13
Downstream Bonding Service Drivers Competition against FTTH
– Deliver 100 Mbps
High BW residential data
IP Video over DOCSIS(VDOC)– High definition Video to multiple devices
• PCs, hybrid STBs, portable devices– High BW Internet streaming
Video conferencing– TelePresence
Commercial service– High BW data services– Bonded T1– High BW Ethernet/L2VPN service
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 14
Reasons to Develop DRFI Beyond D2.0 RFI
Required to specify a multi-channel environment– DOCSIS 2.0 and lower was only single carrier
Cleaned up inaccuracies in 2.0 and lower
Basic idea was no need for external combiner, laser loading concerns and cost reduction?
Criteria was 60 dB CNR assuming a worse case lineup
Applies only to 3.0 CMTS or any multi-carrier DS connector (e-qam)
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 15
dBmV
N=1 : 60
Single Carrier DRFI
1
Center FrequencyMUST 91 <-> 867 MHzMAY 57 <-> 999 MHz
Channel BW6 MHz & 8 MHz
• Annex A & B• Variable Depth Interleaver• HRC, IRC, STD• 64 & 256 QAM• Inband Spurious, Distortion and Noise MER Unequalized MER >35dB, Equalized MER >43dB
• Inband Spurious and Noise ≤-48dBc Spurious and noise within ±50 kHz of the carrier is excluded.
• Phase Noise (single carrier) 1 kHz - 10 kHz: -33dBc double sided noise power 10 kHz - 50 kHz: -51dBc double sided noise power 50 kHz - 3 MHz: -51dBc double sided noise power
• Output Return Loss >14 dB within an active output channel from 88 MHz to 750 MHz >13 dB within an active output channel from 750 MHz to 870 MHz >12 dB in every inactive channel from 54 MHz to 870 MHz >10 dB in every inactive channel from 870 MHz to 1002 MHz
• Power per channel +/- 2dB• Diagnostic Carrier Suppression ≥50dB
• MUST be F Connector.• DRFI compliance testing conducted at room temp
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 16
N=n : 60-ceil[3.6*log2(n)] dBmV
dBmV
N=1 : 60N=2 : 56N=3 : 54N=4 : 52
Power Output for Multiple Carriers per RF Spigot
1 21 21 3 21 3 4
N dBmV
1 60
2 56
3 54
4 52
8 49
16 45
32 42
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 17
DOCSIS 3.0 - US Channel Bonding
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 18
Upstream Bonding - Features
Packet Striping of a minimum of 4 channels– Delivers in excess of 50 Mbps
AES and scalability require hardware upgrade
New CM silicon required
Phased and seamless technology migration
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 20
Upstream Bonding Service Drivers
Competition against FTTH– Deliver 20+ Mbps
High BW residential data
User generated content– Video and photo uploads– Proliferation of social sites
Video conferencing– TelePresence
Commercial service– High BW symmetrical data services– Bonded T1– High BW Ethernet/L2VPN service
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 21
D2.0 is Still not Used
27.2 Mbps total aggregate speed
Achieved 18 Mbps for single CM on US– Fragmentation and concatenation with a huge max burst
Linerate possible of ~ 27 Mbps
Make sure 1.0 CMs, which can’t fragment, have a max burst < 2000 B
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 22
DOCSIS 1.1 Phy Change (PRE-EQ)
US EQ is supported on all cards for 1.0 & 1.1– 8-tap blind equalizer
1.1 allows 'pre-eq' where EQ coefficients are sent during IM & SM allowing CM to pre-distort its signal
Supported on all linecards & IOS that support 1.1– Requires 1.1 capable CMs, but not .cm file– Configurable option
2.0 increases the EQ tap length from 8 to 24– Supported on U/H cards in ATDMA & mixed mode
– Off by default
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 23
Upstream Adaptive Equalization Example
Upstream 6.4 MHz bandwidth 64-QAM signal
After adaptive equalization:DOCSIS 2.0’s 24-tap adaptive equalization—actually pre-equalization in the modem—was able to compensate for nearly all of the in-channel tilt (with no change in digital channel power). The result: No correctable or uncorrectable FEC errors and the CMTS’s reported upstream MER (SNR) increased to ~36 dB.
Before adaptive equalization:Substantial in-channel tilt caused correctable FEC errors to increment at a rate of about 7000 errored codewords per second (232 bytes per codeword). The CMTS’s reported
upstream MER (SNR) was 23 dB.
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 24
DOCSIS 3.0 and M-CMTS Comparisons
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 25
DOCSIS 3.0 Migration: M-CMTS
HFC
Edge QAMs
Current CMTS
DS Bonding and Existing DOCSIS
1.x/2.0 CMs
DOCSIS 2.0 US
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 26
M-CMTS Network Topology
L1/L2/L3 CIN
CMTS
Legacy DS
Bonding Port
EQAM
CM 1Legacy CM
CM 3Legacy CM
CM 43-Ch Bonding
DS 4DS 3DS 2
DS 1
US 1
DTI Server
CM 23-Ch CM
doing 2-Ch Bonding
DTI Clock Card
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 27
M-CMTS
M-CMTS
M-CMTS Core
EQAM
UpstreamReceiver
DOCSIS Timing Server
Wide Area Network
Network Side
Interface (NSI)
Operations Support Systems Interface (OSSI)
Cable Modem to CPE
Interface (CMCI)
Downstream External-Phy
Interface (DEPI)
DOCSIS Timing
Interface (DTI)
Edge Resource Management
Interfaces (ERMI)
Downstream RF Interface
(DRFI)
Cable Modem
(CM)
Operations Support System
Edge Resource Manager
Customer Premises
Equipment (CPE)
Radio Frequency Interface
(RFI)
Hybrid Fiber-Coax Network (HFC)
• Key DOCSIS 3.0 enabling technology• DS scalability of DOCSIS 1.x/2.0• Easy migration to DOCSIS 3.0 DS channel bonding• Enables service convergence and QAM sharing (Video and Data)
• Creates efficiency in CAPEX/service
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 28
DOCSIS 3.0: M-CMTS
HFC
Edge QAMs
CMTS Core
Supports DS Bonding and Existing DOCSIS 1.x/2.0 CMs
DOCSIS 3.0 Bonded US
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 29
DOCSIS 3.0: I-CMTS
HFC
I-CMTS
Supports DS Bonding and Existing DOCSIS 1.x/2.0 CMs
DOCSIS 3.0 Bonded US
DOCSIS 3.0 Bonded DS
High Density Linecards
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 30
Spectrum Example
TDMA @10 Mbps
usf1
FN3 FN4 FN5
Frequency
MC520
MCMTSEQAM
us0
us1
ds0 (P)
e0a (P)
us2
us3 ATDMA @ 25 Mbps
4 X 4 MAC
Domain
usf0
dsf0
dsf1
dsf2
dsf3
e1a (P)
ds1 (P) ds2 (P)
e2a (P)
ds3 (P)
e3a (P)
ds4 (P)
e4a (P)
us10
us9
us8us6
us7
us4
us5 us15
us14
us13
us12
us11 us19
us18
us17
us16
FN2FN1 FN7FN6 FN9 FN10FN8
Bonded Channels
e0c (P)
e0b (P) e1b (P)
e1c (P)
e2b (P)
e2c (P)
e3b (P)
e3c (P)
e4b (P)
e4c (P)
4 X 4 MAC
Domain
4 X 4 MAC
Domain
4 X 4 MAC
Domain
4 X 4 MAC
Domain
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 31
Bandwidth Management
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Bandwidth Management Solutions
SDV– Offer more HD and SD content using less total RF
spectrum with the same STB– Only transmit the content being actively watched– Could make more QAMs available for DOCSIS and
VOD if QAM sharing is implemented Node splits
– Physically reduce the homes passed per HFC node, thus reduce contention per home for Unicast services
– Decombine more attractive– Triggers additional QAMs and CMTS Ports
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 33
Bandwidth Management Solutions (cont)
Traffic “Grooming”
MPEG-4
Broadcast to narrowcast QAM injection– Reduce broadcast domains to smaller DOCSIS & video service groups
– Ultimately a complete Unicast lineup on a per node basis
Analog reclamation for more digital spectrum– More QAM channels for Digital Broadcast, VoD, SDV and DOCSIS
Use every channel available– Manage the channel lineup, fill in the gaps, mitigate noise to enable all
spectrum
1GHz upgrade– Make new spectrum for new CPE above 860 MHz
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 34
1 GHz Upgrade• Network Impact
• <= 750 MHz of BW may not be enough
• Node splitting & SDV alone do not solve HFC BW problem
• 1 GHz BW upgrade required
• 1GHz Network Benefits• Value added capacity
• 60 analog 6 MHz chs gained• Minimal cost per home
passed cost to implement• Electronic-only drop-ins in
most cases
1 GHz is a cost-effective tool to increase broadcast and
narrowcast BW
1GHz Bandwidth Enhancement & Segmentation
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 35
Migration Strategy
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 36
DOCSIS 3.0 Migration Steps - Phased Approach for Improved Time-to-Market
Downstream Bonding
IPV6
Upstream Bonding
Multicast QoS
AES
IPDR
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 37
Initial Migration Goal
Deliver very high speed data service– Deliver 100+ Mbps DS– Deliver 50+ Mbps US
Reduction of node split cost– Multiple DSs per node
• M-CMTS or I-CMTS load balancing– Multiple USs per node
• Leverage existing ports and deploy 2.0 USs
BW flexibility & reduction of CMTS port cost– Break DS/US dependence i.e. independent scalability of US and DS– Reduce cost of DS ports by more than 1/10 – Reduce CMTS port/subscriber cost by 30-50%
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 38
Migration Strategy
Target CMTS upgrades in high priority markets– FiOS & U-Verse competitive markets
– High growth & demographics
– Markets with capacity issues
– Your node
Add more DS QAMs per service group and load balancing– Via I-CMTS and M-CMTS
– Current 1x4 mac domain leaves US stranded
– Increase capacity to existing 1.x/2.0 modem
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 39
Migration Strategy (cont)
Deliver targeted bonded DS chs to DOCSIS 3.0 CMs
Video and data convergence– Video and DOCSIS service group alignment
– DSG & Tru2way will leverage DOCSIS DS BW
Share & leverage existing assets– UEQAMs for VoD, SDV and DOCSIS
– UERM to enable QAM sharing
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 40
DOCSIS 3.0 Status
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DOCSIS 3.0 Status
CMTS can be submitted for Bronze, Silver, or Full
Cablelabs– Qualified 3 CMTS vendors for Bronze for CW56– CW 58 currently underway and will conclude with results
in early May 2008
CMs are only allowed to go for "Full 3.0 Certification" – No 3.0 CMs have been certified by CableLabs
Only silicon that exists to build a FULL capable 3.0 CPE is the Texas Instruments PUMA5 chip– PUMA5 is chip used in most vendor CMs going through CableLabs
CW-58 testing
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 42
DOCSIS 3.0 Status
Broadcom is working on a competing chip for 3.0 CPE but it is not available yet
DPC3000 in CW-58 certification for Full 3.0– Plan is to ship in volume by June 2008
Operators– Working on models to determine QAM requirements– Testing pre and DOCSIS 3.0 compliant DS Bonding– Testing IPV6 in labs – Developing management tools and provisioning
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 43
Three Reference Designs
Broadcom's 3381 3-ch/tuner– SA DPC2505....,
– DPC2100 locks only 6 MHz channels
– EPC2100 locks 8 MHz or 6 MHz channels
TI Puma3 based– Linksys WCM300 with 2 tuners, 6 & 50 MHz passband
TI Puma5 3.0 based– SA DPC3000 w/ 4-ch US & DS bonding, 60 MHz
passband for annex B and 64 MHz for annex A
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 44
Potential Issues
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 45
Design Rules and Restrictions
SA 3 ch CM needs all 3 DS on e-qam for 111 Mbps
– Can do annex B on control channel & 2 annex A chs to get ~95 Mbps, but requires 6+8+8 MHz of BW
SA 4 ch CM has 96 MHz passband filter
Linksys CM has 2 tuners, 1 for control & 1 w/ 50 MHz band
– Starts at lowest freq configured
D3.0 spec goes to 1050 MHz, but some equipment may not
– SA DPC2505 speced to 930 MHz
Can e-qam put out 2 or 4 “haystacks” per port?
– What if it is annex A at 8 MHz ch width?
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 46
DS Ports with Edge-QAM for DS Bonding
DS Combiner
DS Splitter
Requires:
• 4 DS freqs
• 3 US freqs in each node
DS 4 = 609 MHzDSs 0-3 = 603 MHz
Edge1 = 615 MHzEdge2 = 621 MHz
DS Tx
DS0
U0/C0U1/C2
U2/C16
1x3
DS1
U0/C4U1/C6
U2/C17
1x3
DS4
U0/C0
U1/C2
U2/C4
U3/C6
U4/C8
U5/C10
U6/C12
U7/C14
1x8
MC5x20
DS2
U0/C8U1/C10U2/C18
1x3
DS3
U0/C12U1/C14U2/C19
1x3
Edge-QAM
Potential Isolation Path
How to deal with freq stacked DSs if not using them all?
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 47
Harmonic “dsync” Timing Adjustment - Background
To support advanced DCC initialization techniques (2 and >), difference between CM timing offset on old ch and new ch need to be < ~ +/- 6 timing offset units
Harmonic EQAM introduces SYNC timestamp delay which needs to be manually adjusted on per QAM basis using “dsync” command
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 48
Summary
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New Technology Cornerstones DOCSIS 3.0 - channel bonding for higher capacity
–Enable faster HSD service–MxN mac domains now–Enable video over IP solutions
M-CMTS–Lower cost downstream PHY–De-couple DS and US ports
I-CMTS–Allows higher capacity in same box–Same wiring
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 50
DOCSIS 3.0/M-CMTS Concluding Remarks
Promises ten times BW at fraction of cost
Introduce new HSD service of 50 to 75 Mbps
Widespread deployment of DS Bonding in 2008
Backward compatible with existing DOCSIS standards
Allows migration of existing customers to higher tier and DOCSIS 3.0 capability
Allows more BW for legacy DOCSIS 2.0 CM
Allows for a phased deployment
IPV6, US bonding, and other features will follow
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 51
Case Studies/ Architecture Ideas
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 52
Case Study 1Downstream Frequencies
DF1
Upstream Frequencies
UF1 UF2 UF3 UF4DF2 DF3 DF4 DF5
D5
D5
D5
D5
Fiber Node aFNa
U1
U2
U3
U4
Fiber Node bFNb
Fiber Node cFNc
Fiber Node dFNd
U1
U2
U3
U4
U1
U2
U3
U4
U1
U2
U3
U4
D4
Fiber Node eFNd
U1
U2
U3
U4
D3
D2
D1
D4
D3
D2
D1
Load Balancing GroupDOCSIS 3.0 Non Primary
DOCSIS 2.0
DOCSIS 3.0 Primary
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 53
Case Study 2Downstream Frequencies
DF1
Upstream Frequencies
UF1 UF2 UF3 UF4DF2 DF3 DF4 DF5
D5
D5
D5
Fiber Node aFNa
U1
U2
U3
U4
Fiber Node bFNb
Fiber Node cFNc
Fiber Node dFNd
U1
U2
U3
U4
U1
U2
U3
U4
U1
U2
U3
U4
Fiber Node eFNd
U1
U2
U3
U4
D3
D2
D1
D4
D3
D2
D1
Load Balancing Group
D4
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 54
Case Study 3Downstream Frequencies
DF1
Upstream Frequencies
UF1 UF2 UF3 UF4DF2 DF3 DF4 DF5
D5
D5
D5
Fiber Node aFNa
Fiber Node bFNb
Fiber Node cFNc
Fiber Node dFNd
Fiber Node eFNd
D3
D2
D1
D4
D3
D2
D1
Load Balancing GroupFor DOCSIS 2.0 .
D4
Bonding Group For DOCSIS 3.0
C0 C1 C4 C5
C2 C3 C6 C7
C8 C9 C10 C11
C12 C13 C16 C17
C14 C15 C18 C19
DS1DS0
DS2
DS3DS4
Only used for bonding on Node C
Blocks of 3 QAM
4th QAM optional
If 4th qam enabled, can serve 6, 5x20 linecards (30 nodes)
Requires 8*6 = 48 e-qam per 10K
Requires 2*8 = 16 e-qam connectors from NSG9000
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 55
Case Study 4Downstream Frequencies
DF1
Upstream Frequencies
UF1 UF2 UF3 UF4DF2 DF3 DF4 DF5
D5
D5
D5
Fiber Node aFNa
C0
Fiber Node bFNb
Fiber Node cFNc
Fiber Node dFNd
Fiber Node eFNd
D3
D2
D1
D4
D3
D2
D1
D4
Low usage DS
C1 C4 C5
C2 C3 C6 C7
C8 C9 C10 C11
C12 C13 C16 C17
C14 C15 C18 C19
DS1DS0
DS2
DS3DS4
Blocks of 3 QAM
4th QAM optional
If 4th qam enabled, can serve 6, 5x20 linecards (30 nodes)
Requires 8*6 = 48 e-qam per 10K
Requires 2*8 = 16 e-qam connectors from NSG9000
Load Balancing GroupFor DOCSIS 2.0
Bonding Group For DOCSIS 3.0
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 56
Common Option
Pros– 2 bonding freqs / e-qam connector– Can offer 75 Mbps service– Plenty of growth in e-qam chassis– Spare slot can be used for N+1 or 3G40– Legacy = 2 DS/2 nodes & 2 US/1 node– 68 nodes covered = ~ 7 linecards
Cons– 41 e-qam connectors = 48 chs– Only 1 Primary freq / e-qam connector– Last DS on 7th card has no extra
primary ch
• 4 DS freqs
• 2 US freqs
• 2 SPAs
• 3 e-qam chassis
• 5, 2x4 domains + 2
3.2 MHz
6.4 MHz
SPADSs
5x20DSs
WB
P
P PP P
B
603
609
f1
f2
31
FN1 FN2 FN3 FN4 FN5 FN6 FN7 FN8
24
Frequency
TDMA
FN9 FN10
P
P P P P P
ATDMA
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 57
Common Option Wiring
Ups
trea
m
US0
US2
US4
US16D
owns
trea
m
DS0
DS1
DS2
DS3
DS4
US14
US12
US10
US8
US6
US18
Slo
t 2W
B S
PA
Slo
t 4/0
/0H
H G
igE
Slo
t 3/
0/0
HH
Gig
ES
lot
1W
B S
PA
PR
E2
PR
E2
Slo
t 5/0
8x1
8x1
8x1
8x1
603 MHz
603 MHz
603 MHz
603 MHz
1x2
1x2
1x2
1x2
eQAM
Node 1
Node 2
Node 3
Node 4
Node 5
Node 6
Node 7
Node 8
1x8
609, 615 MHz
Combined with Slot 7/0 RFCombined with Slot 6/0 RF
Combined with Slot 5/0 RF
Combined with Slot 6/1 RFCombined with Slot 7/1 RFCombined with Slot 8/1 RF
24 & 31 MHz6.4 & 3.2 MHz
Slot 8/0
Node 9
Node 10
603 MHz
1x2
8x1
Combined with Slot 8/0/0; 621 MHzCombined with Slot 8/0/1Combined with Slot 8/0/2Combined with Slot 8/0/3Combined with Slot 8/0/4
Slot 8/0
Slot 8/1
Slot 7/0
Slot 7/1
Slot 6/0
Slot 6/1
Slot 5/0
May require special isolation amp
eQAM
eQAM
© 2006 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialPresentation_ID 58