docsis 3.0 ds planning & bandwidth management john downey, consulting network engineer – cmts...
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DOCSIS 3.0 DS Planning & Bandwidth Management
John Downey, Consulting Network Engineer – CMTS BU
© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 2© 2010 Cisco Systems, Inc. All rights reserved. Cisco ConfidentialC97-552046-00 2
• Objectives
• Terms
• M-CMTSAdapters and connectivity, linecards, timing servers, e-qams, ..
• I-CMTS
• Optional Architectures
• Frequency Stacking Levels
• Frequency Placement
• Isolation Concerns
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• Why it’s NeededCompetitive pressure, offering higher tiers of service, more
customers signing up
• Frequency Stacking Levels & PlacementWhat is the e-qam max output with four channels stacked
Do channels have to be contiguous?
• Isolation ConcernsApplications w/ different service grps lead to overlaid networks
Signals destined for one node could “bleed” over to another
• DS Frequency Expansion to 1 GHzAmplifier 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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• 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 capabilityBetter Stat Muxing
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• 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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• Uses M-CMTS compliant Edge-QAMCisco 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 operationAllows MxN mac domains
• Eliminates need for PC from 5x20 card
• Allows bonding on all channels in a BGHits the 100 Mbps BW mark on a 3-channel CM
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L1/L2/L3 CIN
uBR10k
5X20
SPAEQAM
CM 1Legacy Modem
CM 3Legacy Modem
CM 43-Channel Bonding
DS 4
DS 3
DS 2
DS 1
US 1
DTI Server
CM 23-Channel Modem
doing 2-Channel Bonding
Eightbells
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• CMTS
Cable linecard
US ports needed and host
DS bonding adapter
1 Gbps fiber or copper ports
DTI timing card
• DTI Server (Symetricom)
• M-CMTS compliant EQAM
Cisco RFGW-1D or RFGW-10
Harmonic NSG9000
Arris
• WCM300 (Linksys BroadLogic)
• SA 3-Ch DPC 2505 (BCM 3381)
• Cisco/SA DPC 3000 4x4 TI
• Cisco/SA DPC 3010 8x4 Brcm
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CM CM CMCMSA DPC
3000
MC5x20H
CPU/RP
Jacket Card
uBR10KCMTS
D3.0 DS + Primary
NB DS
WB DSSPA
WB DSSPA
Backhauls
SA DPC-2505
Primary Ch
D3.0 BG
Primary
DTI Card
DTI Card
DTI Server
M-C
MT
S E
QA
M
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• Any rules-of-thumb to estimate service group size?
• What recommendations are there for HE combining/splitting to avoid intrusive changes later?
• Any impairments in HE or plant that will affect DOCSIS 3.0 more compared to earlier versions? Isolation
Off-air Ingress
Attenuation
Freq assignments, spectrum allocation, plant limits
• If small amount of extra BW needed, is it possible to split 4 chs from DS port to use 2 chs in one SG and other 2 in another SG?
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1x2
1x2
1x2
1x2
eQAM
609, 615, 621, 627 MHz
8/0/2
22 & 28 MHz6.4 & 3.2 MHz
Slot 8/0
1x2
eQAM
8/1/08/1/1
8/1/28/1/3
8/0/08/0/1
8/1/4
8/0/38/0/4
eQAM
6/0/0, 6/0/1, 6/0/2, 6/0/3, 6/0/46/1/0, 6/1/1, 6/1/2, 6/1/3, 6/1/4
5/0/4
5/0/05/0/1
Ups
tre
am
US0
US2
US4
US16
Dow
nst
rea
m
DS0
DS1
DS2
DS3
DS4
US14
US12
US10
US8
US6
US18
1/0/
0S
PA
3/2/
010
GE
3/3/
0S
PA
PR
E4
PR
E4
Slo
t 5/0
1/2/
010
GE
1/1/
0S
PA
1/3/
0S
PA
3/0/
0S
PA
3/1/
0S
PA
Node 1
Node 2
Node 3
Node 4
Node 5
Node 6
Node 7
Node 8
Node 9
Node 10
Ser
vice
Gro
upS
ervi
ce G
roup
Ser
vice
Gro
upS
ervi
ce G
roup
Ser
vice
Gro
up
7/0/0, 7/0/1, 7/0/2, 7/0/3, 7/0/47/1/0, 7/1/1, 7/1/2, 7/1/3, 7/1/4
5/0/2, 5/0/3
4x1
4x1
4x1
4x1
4x1
• 5 DS frequencies
1 I-DS
4 M-DS
(5 Primary)
2 US frequencies
2 channel bonding
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B
P PP P
Bonding across 4
freqs & 5-ch load
balance for legacy CMs
603
609
FN1 FN2 FN3 FN4 FN5 FN6 FN7 FN8
22
Frequency
ATDMA
B
TDMA
P
P
28
615
621
627
P
P
B
P
P
P
P
B
P
P
P
P
B
P
P
P
P
P
B
P
P
P
P
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
• 5 DS freqs
• 2 US freqs
16-QAM
64-QAM
3.2 MHz
6.4 MHz
Local Bonding
Remote PrimaryP
P Local Primary
B Remote Bonding
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1x2
1x2
1x2
1x2
22 & 28 MHz6.4 & 3.2 MHz
Slot 8/0
1x2
Ups
trea
m
US0
US2
US4
US16
Dow
nst
ream
DS0
DS1
DS2
DS3
DS4
US14
US12
US10
US8
US6
US18
1/0/
0S
PA
3/2/
010
GE
3/3/
0S
PA
PR
E4
PR
E4
Slo
t 5/0
1/2/
010
GE
1/1/
0S
PA
1/3/
0S
PA
3/0/
0S
PA
3/1/
0S
PA
Node 1
Node 2
Node 3
Node 4
Node 5
Node 6
Node 7
Node 8
Node 9
Node 10
Ser
vice
Gro
upS
ervi
ce G
roup
Ser
vice
Gro
upS
ervi
ce G
roup
Ser
vice
Gro
up
4 DS frequencies (4 I-DS) 2 US frequencies
2 channel bonding
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Bonding across 4
freqs & 4-ch load
balance for legacy CMs609
FN1 FN2 FN3 FN4 FN5 FN6 FN7 FN8
22
Frequency
ATDMA
B
TDMA
P
P
28
615
621
627
P
P
B
P
P
P
P
B
P
P
P
P
B
P
P
P
P
B
P
P
P
P
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
• 4 DS freqs
• 2 US freqs
16-QAM
64-QAM
3.2 MHz
6.4 MHz
Local PrimaryP
B Local Bonding
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• Pros Four bonding freqs / e-qam connector Only 1 e-qam connector per 8 nodes Basic = 2 DS/2 nodes with DCC support US load balance of 2.0 CMs One US connector shared across 2 nodes
for diminishing D1.x CMs
• Cons Requires M-CMTS architecture Requires five DS & three US freqs Must push 3.0 CMs to remote DS Bonding group must be same IP bundle CM ranging overlap with “real” data?
P PP P Basic
Extended
603
609
615
621
32
FN1 FN2 FN3 FN4 FN5 FN6 FN7 FN8
22
Frequency
ATDMA
ATDMA
S
627
37 TDMA
P
P
P
P
3.2 MHz
6.4 MHz
RemoteDSs
LocalDSs
• 5 DS freqs
• 3 US freqs
• 2x5 domain
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• Pros 8 bonding freqs per 2 connectors 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
• ConsRequires 8 DS & 3 US freqs
Extended
609
615
621
32
FN1 FN2 FN3 FN4 FN5 FN6 FN7 FN8
22
Frequency
ATDMA
ATDMA
S
627
37 TDMA
P
P
P
P
B
PPPP
B
PPPP
B
PPPP
B
PPPP
3.2 MHz
6.4 MHz
LocalDSs
• 8 DS freqs
• 3 US freqs
• 5x5 domain
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• Pros Four bonding freqs / e-qam connector One e-qam connector per 2 nodes Basic = 5 DS/2 nodes with DCC support US load balance of 2.0 CMs One US connector shared across 2 nodes
for diminishing D1.x CMs
• Cons Requires M-CMTS architecture Requires five DS & three US freqs Must push 3.0 CMs to remote DS Four e-qam connectors and 16 e-qam chs
per 8 nodes
P PP P Basic
Extended
603
609
615
621
32
FN1 FN2 FN3 FN4 FN5 FN6 FN7 FN8
22
Frequency
ATDMA
ATDMA
627
37 TDMA
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
P
3.2 MHz
6.4 MHz
RemoteDSs
LocalDSs
• 5 DS freqs
• 3 US freqs
• 5x5 domain
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• Frequency assignmentsCMTS 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 USsDistance limitation, time offset differences, level differences
• Resiliency is another topic to addressIf one DS frequency goes bad in the field, how will CMs recover or
react?
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• E-qam licensing?
• CM requires 1.1 config file
• More DS = more US
• Testing and maintaining multiple DS channelsPhysical 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 stackedFour 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 Combiner
DS Splitter
Requires:
• 5 DS freqs
• 3 US freqs in each node
DSs 0-3 = 603 MHzE-QAM = 609, 615,
621, & 627 MHz
DS Tx
Potential Isolation Path
DS0
U0U1U2U3
1x4
DS1
U0U1U2U3
1x4
DS2
U0U1U2U3
1x4
DS3
U0U1U2U3
1x4
Edge-QAM
61?
52?Isolation amp
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• Can this device handle 50 dBmV inputs?
W
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• D3.0 spec goes to 1 GHz, some equipment may notSA DPC2505 speced to 930 MHz
• DPC2505, 3 ch CM needs all 3 DSs for 111 MbpsCan do annex B &/or A; but requires more spectrum
• D3.0 CM spec requires 60 MHz capture window
• DPC3000 capture of 96 MHz over most spectrum82 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)DS freqs must be contiguous within tuner block unlike 4x4 CMs
Can use RCC templates to setup both tuners
New feature called Split Tuner will analyze RCC & create 2 Rx modules and move tuners automatically without RCC templates
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• Restrict legacy eMTAs to Local DS
• Enforce legacy CMs to only register on Primary-only DS
• Enforce legacy CMs to move to specific DS freq
• Force 3.0-capable CMs to initialize on bonding capable primary DS
• Can specify UCDs sent for each DS
• Put voice call service flows on a primary DScable docsis30-voice downstream req-attr-mask 0 forb-attr-mask
80000000
EDCS-668028 explains this feature
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• 2x4 domain appears as 2, 1x2 domains
DS0
U0
U1U2
U3
1x4
Edge-QAM
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• Cost effective and faster time to marketDecrease 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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• Long term D3.0 service planning Insure optimized frequency allocation
• Enable seamless upgrade to higher D3.0 tiersWire once & add QAM chs as tiers or service take-rates go up
• End-to-end solution minimizes riskCMTS, QAM, and CPE
• Can also disable DS bondingNo cable mrc-mode
Per-CM exclude with vendor specific MIB or TLV