Transcript Planning for DOCSIS 3.0 - SCTE Penn

DOCSIS 3.0 DS
Planning & Bandwidth
Management
John Downey, Consulting Network Engineer – CMTS BU
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Agenda
 Objectives
 Terms
 M-CMTS
– SPAs, timing servers, e-qams, 5x20, 3G60..
 I-CMTS
– 20x20
 Optional Architectures
 Frequency Stacking Levels
 Frequency Placement
 Isolation Concerns
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DS Questions & Potential Concerns
 Why it’s Needed
– Competitive pressure, offering higher tiers of service, more
customers signing up
 Frequency Stacking Levels & Placement
– What is the e-qam max output with four channels stacked
– Do channels have to be contiguous?
 Isolation Concerns
– Applications w/ different service grps lead to overlaid networks
– Signals destined for one node could “bleed” over to another
 DS Frequency Expansion to 1 GHz
– Amplifier upgrades are occurring now. It’s best to make the
truck roll once, so think about diplex filters, spacing, taps, etc.
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Business Objectives
 Allow more BW for DOCSIS 1.x & 2.0 CMs
 Limit/reduce more node splits
 Introduce new HSD service of 50 to 100 Mbps
 Allow migration of existing customers to higher
tier and DOCSIS 3.0 capability
– Better Stat Muxing
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DOCSIS 3.0 Terms






Local DS = CMTS DS
Remote DS = E-QAM DS
Primary = DOCSIS messaging
Secondary = Bonding
“Wideband” generically used to describe D3.0 DS bonding
Channel Grouping Domain (CGD) is MxN mac domain
– Mac Domain = 1 DS & N USs
 Service group = CMTS Fiber Node config
 M-CMTS is an architecture, not necessarily D3.0
– Provides DS load balance within MxN domain
 I-CMTS allows MxN and bonding within linecard
 D3.0 CM supports minimum of 4 US and 4 DS chs
 CMs on market are 4x4 (TI-based) & 8x4 (Brcm-based)
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DOCSIS 3.0 DS Ch Bonding over SPA Overview
 Uses M-CMTS compliant Edge-QAM
– Cisco RFGW-1D and RFGW-10
– Harmonic NSG-9000
 Increase legacy DS port density of uBR10K
 Uses DTI timing source for DS channels
 Enables legacy DOCSIS [1.x/2.0] CMs to use external
QAMs for operation
– Allows MxN mac domains
 Eliminates need for PC from 5x20 card
 Allows bonding on all channels in a BG
– Hits the 100 Mbps BW mark on a 3-channel CM
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Narrowband Network Topology
Eightbells
DTI Server
DS 4
L1/L2/L3 CIN
EQAM
DS 3
SPA
DS 2
uBR10k
DS 1
5X20
US 1
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CM 1
CM 2
Legacy Modem
3-Channel Modem
doing
2-Channel Bonding
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CM 3
CM 4
Legacy Modem 3-Channel Bonding
7
DOCSIS 3.0 M-CMTS System
DTI Server
WB DS
SPA
D3.0 DS + Primary
DTI
Card
DTI
Card
WB DS
SPA
D3.0 BG
M-CMTS EQAM
Jacket
Card
Primary Ch
CPU/RP
Primary
MC5x20H
CM
CM
CM
CM
SA DPC
3000
SA
DPC-2505
Backhauls
uBR10K
CMTS
NB DS
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Questions
 Are their any rules-of-thumb to estimate the service group size?
 What recommendations are there for HE combining/splitting in order to
avoid intrusive changes later?
 Are there any impairments in the HE or in the plant that will affect
DOCSIS 3 .0 more compared to earlier versions?
– Isolation
– Off-air Ingress
– Attenuation
– Freq assignments, spectrum allocation, plant limits
 If a small amount of extra BW is needed, is it possible to split 4 chs
from a DS port to use 2 chs in one SG and the other 2 in another SG?
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Option 1: 100 Mbps Tier & 2 Channel US Bonding
Cisco Products
Slot 8/0
1
x
2
US10
US12
1/0/0
SPA
1/2/0
10GE
US14
1
x
2
PRE4
US16
US18
4x1
Downstream
1/1/0
SPA
1/3/0
SPA
DS0
4x1
DS1
4x1
DS2
4x1
DS4
8/1/1
8/1/2
eQAM
1
x
2
8/1/3
8/1/4
5/0/0
5/0/1
8/0/4
8/0/3
8/0/2
8/0/1
8/0/0
eQAM
7/0/0, 7/0/1, 7/0/2, 7/0/3, 7/0/4
7/1/0, 7/1/1, 7/1/2, 7/1/3, 7/1/4
5/0/2, 5/0/3
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Node 3
Node 5
Node 7
Node 9
Node 4
Node 6
Node 8
 Spumoni SIP with 6 SPAs
 5x20H linecards
 RFGW-1 EQAM
3 chassis
6 modules each
 DPC/EPC 3000 CM
 DPC/EPC 3002 eMTA
4x1
DS3
8/1/0
1
x
2
Service Group
Upstream
3/3/0
SPA
3/1/0
SPA
US8
 “Amazon”, 12.2SCB IOS
Service Group
PRE4
US6
Node 2
Service Group
1
x
2
US4
Service Group
Slot 5/0
3/0/0
SPA
3/2/0
10GE
US2
 UBR10012 CMTS w/ PRE4
Node 1
Service Group
22 & 28 MHz
6.4 & 3.2 MHz
US0
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609, 615, 621, 627 MHz
6/0/0, 6/0/1, 6/0/2, 6/0/3, 6/0/4
6/1/0, 6/1/1, 6/1/2, 6/1/3, 6/1/4
5/0/4
eQAM
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Node 10
Resources (Per SG)
 5 DS frequencies
1 I-DS
4 M-DS
(5 Primary)
 2 US frequencies
2 channel bonding
21
Option 1 = 100 Mbps Service Tier
Frequency
• 5 DS freqs
• 2 US freqs
627
P
P
P
P
P
621
P
B
P
P
B
P
P
B
P
P
B
P
B
Remote Bonding
615
P
B
P
P
Remote Primary
609
B
P
P
P
P
P
Local Bonding
P
Local Primary
603
P
P
P
P
P
Bonding
across 4
freqs & 5-ch
load
balance for
legacy CMs
16-QAM
64-QAM
28
TDMA
22
ATDMA
3.2 MHz
6.4 MHz
FN1
•
•
•
•
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FN2
FN3
FN4
FN5
FN6
FN7
FN8
FN9
FN10
5, 5x4 MAC domains with ATDMA & TDMA USs
E-qam overlaid for 2 nodes 70/2 = 35 connectors
3 e-qam chassis with 6 modules each
4 freqs * 35 = 140 QAMs = 6 SPAs = Spumoni & PRE4
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20x20 Option 1: 100 Mbps Tier & 2 Ch US Bonding
Cisco Products
 UBR10012 CMTS w/ PRE4
1
x
2
US10
US12
1/0/0
SPA
1/2/0
10GE
US14
1
x
2
PRE4
US16
US18
Downstream
1/1/0
SPA
1/3/0
SPA
DS0
1
x
2
DS1
DS2
Node 3
Node 5
Node 4
Node 6
 20x20V linecards
 DPC/EPC 3000 CM
 DPC/EPC 3002 eMTA
Resources (Per SG)
 4 DS frequencies
4 I-DS
Node 7
Node 9
Node 8
 2 US frequencies
2 channel bonding
DS3
DS4
1
x
2
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Service Group
Upstream
3/3/0
SPA
3/1/0
SPA
US8
Service Group
PRE4
US6
 “Bighorn”, 12.2SCC IOS
Node 2
Service Group
Slot 5/0
1
x
2
US4
Node 1
Service Group
US2
3/0/0
SPA
3/2/0
10GE
22 & 28 MHz
6.4 & 3.2 MHz
Service Group
Slot 8/0
US0
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Node 10
23
20x20 Option 1 = 100 Mbps Service Tier
Frequency
• 4 DS freqs
• 2 US freqs
627
P
P
P
P
P
621
P
B
P
P
B
P
P
B
P
P
B
P
P
P
P
P
B
Local Bonding
615
P
B
P
P
Local Primary
609
P
Bonding
across 4
freqs & 4-ch
load
balance for
legacy CMs
16-QAM
64-QAM
28
TDMA
22
ATDMA
3.2 MHz
6.4 MHz
FN1
FN2
FN3
FN4
FN5
FN6
FN7
FN8
FN9
FN10
• 5, 4x4 MAC domains with ATDMA & TDMA USs
• DS connector overlaid for 2 nodes, 35 connectors*2 = 70 nodes
• 4 freqs * 35 = 140 QAMs = PRE4
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DOCSIS 3.0 Option 2
Frequency
• 5 DS freqs
• 3 US freqs
• 2x5 domain
3.2 MHz
6.4 MHz
627
P
621
P
S
615
Extended
P
609
P
603
P
P
P
P
Basic
37
TDMA
32
ATDMA
22
ATDMA
Remote
DSs
Local
DSs
FN1 FN2 FN3 FN4 FN5 FN6 FN7 FN8
 Pros
– Four bonding freqs / e-qam connector  Cons
– Requires M-CMTS architecture
– Only 1 e-qam connector per 8 nodes
– Requires five DS & three US freqs
– Basic = 2 DS/2 nodes with DCC support
– Must push 3.0 CMs to remote DS
– US load balance of 2.0 CMs
– Bonding group must be same IP bundle
– One US connector shared across 2
– CM ranging overlap with “real” data?
nodes for diminishing D1.x CMs
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20x20 DOCSIS 3.0 Option 2
Frequency
• 8 DS freqs
• 3 US freqs
• 5x5 domain
627
P
621
P
S
615
609
P
6.4 MHz
Local
DSs
P
P
P
B
P
P
3.2 MHz
Extended
P
P
B
P
P
P
P
B
P
P
P
P
B
P
P
37
TDMA
32
ATDMA
22
ATDMA
FN1 FN2 FN3 FN4 FN5 FN6 FN7 FN8
 Pros
 Cons
– 8 bonding freqs per 2 connectors
– Requires 8 DS & 3 US freqs
– Only 5 connectors per 8 nodes
• Can provide 8 ch DS bonding
– US load balance of 2.0 CMs
– One US connector shared across 2 nodes for
diminishing D1.x CMs
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DOCSIS 3.0 Option 2 Wiring Diagram
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DOCSIS 3.0 Option 3
Frequency
• 5 DS freqs
• 3 US freqs
• 5x5 domain
3.2 MHz
6.4 MHz
627
P
P
P
P
621
P
P
P
P
615
P
P
P
P
609
P
P
P
P
603
P
P
P
P
Extended
Basic
37
TDMA
32
ATDMA
22
ATDMA
Remote
DSs
Local
DSs
FN1 FN2 FN3 FN4 FN5 FN6 FN7 FN8
 Pros
Cons
– Four bonding freqs / e-qam connector 
– Requires M-CMTS architecture
– One e-qam connector per 2 nodes
– Requires five DS & three US freqs
– Basic = 5 DS/2 nodes with DCC support
– Must push 3.0 CMs to remote DS
– US load balance of 2.0 CMs
– One US connector shared across 2
– Four e-qam connectors and 16 e-qam
nodes for diminishing D1.x CMs
chs per 8 nodes
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DOCSIS 3.0 DS Considerations
 Frequency assignments
– CMTS may be limited to 860 MHz or 1 GHz
– Legacy CMs (1.x & 2.0) limited to 860 MHz bandedge
– E-qam limited to contiguous 24 MHz or 4 channel slots
• Annex A may only be 3 chs vs 4 for annex B
– CMs may be limited to 50 or 60 MHz passband
 M-CMTS architecture requires DTI and local USs
– Distance limitation, time offset differences, level
differences
 Resiliency is another topic to address
– If one DS frequency goes bad in the field, how will CMs
recover or react?
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DOCSIS 3.0 DS Considerations (cont)
 E-qam licensing?
 CM requires 1.1 config file
 More DS = more US
 Testing and maintaining multiple DS channels
– Physical chs have not changed for DOCSIS 3.0
– Test equip with built-in CMs need to support bonding
 DS ch bonding max power with 4 freqs stacked
– Four chs stacked on 1 connector limited to 52 dBmV/ch
• DOCSIS 1.x/2.0 DS is 61 dBmV max output
 DS isolation issues
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DS Ports with Edge-QAM for DS Bonding
61?
DS0
1x4
1x4
DSs 0-3 = 603 MHz
E-QAM = 609, 615,
621, & 627 MHz
U0
U1
U2
U3
DS1
Potential Isolation Path
U0
U1
U2
U3
1x4
DS Combiner
DS2
DS Splitter
U0
U1
U2
U3
1x4
DS Tx
DS3
U0
U1
U2
U3
Requires:
• 5 DS freqs
• 3 US freqs in each node
52?
Isolation amp
Edge-QAM
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Isolation Amp
W
• Can this device handle 50 dBmV inputs?
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Design Rules & Restrictions
 D3.0 spec goes to 1 GHz, some equipment may not
– SA DPC2505 speced to 930 MHz
 DPC2505, 3 ch CM needs all 3 DSs for 111 Mbps
– Can do annex B &/or A; but requires more spectrum
 D3.0 spec requires 60 MHz capture window
 DPC3000 capture of 96 MHz over most spectrum
– 82 MHz max window supported over entire spectrum
 TI 4x4 CM (60 MHz window)
 Brcm 8x4 CM (2, 32 MHz bands or 1, 96 MHz band)
– Can use RCC templates to setup both tuners
– DS freqs must be contiguous within tuner block unlike 4x4 CMs
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Modem Steering
 Restrict legacy eMTAs to Local DS
 Enforce legacy CMs to only register on Primaryonly DS or move to a specific DS frequency
 Enforce legacy CMs to move to specific DS freq
 Force 3.0-capable CMs to initialize on Remote DS
 Can specify UCDs sent for each DS
 Put voice call service flows on a primary DS
– cable docsis30-voice downstream req-attr-mask 0 forb-attr-mask
80000000
– EDCS-668028 explains this feature
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Node Splitting
1x4
DS0
U0
U1
U2
U3
Edge-QAM
• 2x4 domain appears as 2, 1x2 domains
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Summary
 Cost effective and faster time to market
– Decrease DS costs – deploy D3.0 later with no additional
CMTS investment!
 Targeted insertion of D3.0
– Leverage existing US chs while adding more DS
capacity
– Load balance 1.x/2.0 and enable D3.0 when needed
– Minimizes capex & opex
 Leverage D3.0 bonding for D2.0 tiers & services
– Better stat-mux efficiency & improved consumer
experience
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Summary (cont)
 Long term D3.0 service planning
– Insure optimized frequency allocation
 Enable seamless upgrade to higher D3.0 tiers
– Wire once & add QAM chs as tiers or service take-rates
go up
 End-to-end solution minimizes risk
– CMTS, QAM, and CPE
 Can also disable DS bonding
– No cable mrc-mode
– Per-CM exclude with vendor specific MIB or TLV
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