Transcript APPA Presentation

2005 APPA Community Broadband Conference
Operating an HFC Network? How is FTTH in Your Future
Mark Klimek
Bill Lee
Alcatel
IBSI
919-850-6554
215-354-1604
[email protected] [email protected]
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Overview
Page 2
HFC Network-Bandwidth Usage
Future Services
HFC to FTTH - Determining When to Convert
HFC to FTTH - A Case Study
Top 4 Reasons for FTTH
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HFC Network-Bandwidth Usage
Page 3
80 Analog Channels (500 MHz)
120-160 Digital Channels (100 MHz)
High Speed Data Channels (18 MHz)
Video on Demand Channels (30 MHz)
High Definition Channels
 8 Off Air HD Channels (48 MHz)
 8 Satellite HD Channels (48 MHz)
Total Bandwidth Usage: 744 MHz
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Future Services
Page 4
Voice over IP
Gaming (MMDS, Interactive, etc.)
Network PVR
Security
Distance Learning
HD VoD
Other Services not yet conceived
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HFC to FTTH-Determining When to Convert?
Page 5
Existing Network
System Size
Customers/Subscribers
Services Offered/Planned
Construction (Make Ready)
 Upgrade
 Rebuild
 New Build
New Deployment
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HFC to FTTH- A Case Study (HFC)
Page 6
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HFC to FTTH-A Case Study (proposed FTTH migration)
Page 7
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HFC to FTTH-Things to Consider
Page 8
Proper sizing of HFC network early on - Critical
Case Study was from Node+0, Node+1 HFC (125 HP)
6 fibers to each node
Nodes replaced by Fiber Enclosure (splitters)
Split into 32 (64-GPON) home pockets
Port utilization
Majority Overlash is with 24ct fiber
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Top 4 Reasons for FTTH
Page 9
Future-Proof Network
Same network for business & residential customers
Protection from Competition
Avoid Make Ready Work
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What is a Passive Optical Network (PON)?
Page 10
 Physical point-to-multipoint fiber connection




Passive splitters split feeder fiber
Multiple drops connect end users
Outside plant requires no power, low maintenance
PON is an end-user technology optimized for the mass scale
Glass splitter
CO
Customer
 Three models of PON available today:
 Broadband PON (BPON)
 Gigabit PON (GPON)
 Ethernet PON (EPON) (also called Gigabit Ethernet PON, GEPON)
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Standards Comparison Overview
Page 11
IEEE EPON
ITU-T GPON
ITU-T BPON
Downstream Line Rates (Mb/s)
1250
2488
622
Upstream Line Rates (Mb/s)
1250
1244
155
8b/10b
NRZ (+ scrambling)
NRZ (+ scrambling)
Addressing capability (min)
16
64
32
Addressing capability (Max)
N/A
128
64
0.5 m-10 km or 0.5 m-20
km
Ethernet
20 km
20 km
Ethernet over GEM
ATM
TDM over Packet
Native TDM or TDM
over Packet
TDM over ATM
Dep. on # of LLIDs / ONT
4096
256
Eth OAM (+ optional
SNMP)
PL OAM + OMCI
PL OAM + OMCI
Not defined
AES (counter mode)
Churning or AES (am.2)
Line coding
Minimum logical reach supported by
TC
Layer 2 protocol
TDM support
Number of traffic flows/ PON system
OA&M and Management
Downstream Security
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Service Support With GPON
Page 12
Voice Service
 POTS to Class 5 switch (requires voice gateway)
 POTS directly to softswitch (usually SIP or H.248)
 Via Ethernet with SIP-phone
Data Service
 High-speed Internet (HSI) service
– Prioritized and differentiated service capability
 DS-1 / DS-3 Service
– Circuit based services including “Specials”
– Use TDM over Packet (CESoIP) technology
Video Service
 IPTV
– MPEG2/4, Ethernet transport, IGMP signaling
 RF video
– Analog + digital RF-based, same as CATV operation
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PON Components
Page 13
 Packet Optical Line Terminal (P-OLT)
 Located in headend / central office
 ATM or Ethernet switch
 Sources PONs (typically 40-80 PONs per OLT)
 Optical Network Terminal (ONT
 Equipment at customer location
 Optimized for application and number of interfaces
 Video OLT (EDFA)
 Video amplifier, power sized for PON outside plant
 Used for RF video only; same model as CATV
 WDM
 Used to merge the data and RF video paths on fiber
 Splitter
 Optical devices that allow multiple users to share the single fiber
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Typical GPON Deployment
Page 14
Central Office or
Headend
Fiber
Distribution
Passive
Outside Plant
20 km (12.4 mi.)
Management
System
P-OLT
HSI, DS-1
Voice
IP Video
Splitters
1,490 nm
1,310 nm
WD
M
2.5 Gb/s
1.2 Gb/s
RF Video
RF-Video Source
ONTs
V-OLT
(EDFA)
1,550 nm
 Voice, data and video (bi-directional) for up to 64 subscribers over a single fiber
 Coarse WDM supports 2 or 3 wavelengths — 1490/1310/1550 nm
 2.5G/ 1.2Gb/s line rate over two wavelengths – RF video is independent
 20 km (12.4 mi.) span
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Outside Plant Parameters
Page 15
 Will be evaluated for a PON deployment
 Should be taken into account in an HFC deployment if considering PON for
future
 Topology
 Centralized vs. distributed splitting
 Splitter variables
 Optical loss
 Split ratio
 1:16 / 1:32 / 1:64
 Distance
 1-20km
 Optical Budget
 Typically 28dBm
 FEC extends digital path reach
 RF budget varies with analog / digital channel mix, EDFA power level
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FTTU Outside Plant
Page 16
 Similar to HFC OSP architecture
Feeder OSP
Cable From
CO /
Headend
Fiber
Distribution
Hub (FDH)
Splice Case
ONT
Drop
Cable
Distribution
Cable
Distribution
Cable
Splice Case
TAPTerminal
Access
Point
Access
Terminal
ONT
Alliance
Drop
Cable
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Operational and Maintenance Costs
Page 17
 Maintenance costs can differ significantly between fiber and copper
technologies
 PON is passive from the CO/headend; no nodes to maintain and power
 Fiber splices have longer lifetimes than copper joins
 No corrosion issues with fiber
 Operational costs also differ
 GPON designed to deliver triple-play services
 The ONT is a very intelligent device at the user premise
– Full enable/disable control of each service
– Management, measurement and statistics for operations and marketing
 End-to-End management is standardized via the OMCI reducing provisioning time,
allowing inter-operability, and simplifying testing
 Industry estimates of the OPEX cost savings of a fiber deployment over a
copper deployment range from 20% - 50% annually
 When factored into a business case, this is a significant saving
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HFC to PON: How to Transition?
Page 18
 Cap and grow:
 Transition from HFC to PON
 Complete build of areas covered by HFC nodes
 Begin deployment of PON in new areas
 Challenge: Can only offer HFC-level capabilities on higher performance PON
 Benefit: Do get benefits of reduced operational and maintenance expenses
 Overbuild / replacement
 Replace existing HFC plant with PON
 Allows ubiquitous service offering to all customers
 Gains of operational and maintenance expenses
 Challenge will be to depreciate / payoff HFC equipment
 Likely scenario is a combination of both models
 Retain existing HFC as long as possible
 Begin deployment of PON as soon as possible
 Overbuild high take rate or areas challenged by competition
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GPON Replacing HFC in Field
Page 19
Splices, additional
splitters or homerun
fiber
Management
System
P-OLT
replaces
CMTS
HSI, DS-1
Voice
IP Video
WD
M
(new
)
Distribution fiber
could be reused.
Need to size it
correctly during
HFC build
Splitters
Replace
active HFC
node
RF-Video Source
V-OLT
(EDFA)
Could reuse if power
level is appropriate
ONTs
Drop fiber to
replace coax
drops
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Page 20
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