2005 appa community broadband conference operating an hfc network? how is ftth in your future

All rights reserved © 2005, Alcatel, IBSI

2005 APPA Community Broadband Conference

Operating an HFC Network? How is FTTH in Your Future

Mark Klimek

Alcatel 919-850-6554

[email protected]

Bill Lee

IBSI 215-354-1604

[email protected]


Overview

HFC Network-Bandwidth UsageFuture ServicesHFC to FTTH - Determining When to ConvertHFC to FTTH - A Case StudyTop 4 Reasons for FTTH


HFC Network-Bandwidth Usage

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


Future Services

Voice over IPGaming (MMDS, Interactive, etc.)Network PVRSecurityDistance LearningHD VoDOther Services not yet conceived


HFC to FTTH-Determining When to Convert?

Existing NetworkSystem SizeCustomers/SubscribersServices Offered/PlannedConstruction (Make Ready)

Upgrade Rebuild New Build

New Deployment


HFC to FTTH- A Case Study (HFC)


HFC to FTTH-A Case Study (proposed FTTH migration)


HFC to FTTH-Things to Consider

Proper sizing of HFC network early on - CriticalCase Study was from Node+0, Node+1 HFC (125 HP)

6 fibers to each nodeNodes replaced by Fiber Enclosure (splitters)Split into 32 (64-GPON) home pockets Port utilizationMajority Overlash is with 24ct fiber


Top 4 Reasons for FTTH

Future-Proof NetworkSame network for business & residential customersProtection from CompetitionAvoid Make Ready Work


What is a Passive Optical Network (PON)?

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

COCustomer

Three models of PON available today: Broadband PON (BPON) Gigabit PON (GPON) Ethernet PON (EPON) (also called Gigabit Ethernet PON,

GEPON)


Standards Comparison Overview

IEEE EPON ITU-T GPON ITU-T BPON

Downstream Line Rates (Mb/s) 1250 2488 622

Upstream Line Rates (Mb/s) 1250 1244 155

Line coding 8b/10b NRZ (+ scrambling) NRZ (+ scrambling)

Addressing capability (min) 16 64 32

Addressing capability (Max) N/A 128 64

Minimum logical reach supported by TC

0.5 m-10 km or 0.5 m-20 km

20 km 20 km

Layer 2 protocol Ethernet Ethernet over GEM ATM

TDM support TDM over Packet Native TDM or TDM

over Packet TDM over ATM

Number of traffic flows/ PON system Dep. on # of LLIDs / ONT 4096 256

OA&M and Management Eth OAM (+ optional SNMP)

PL OAM + OMCI PL OAM + OMCI

Downstream Security Not defined AES (counter mode) Churning or AES (am.2)


Service Support With GPON

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


PON Components

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


Typical GPON Deployment

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

20 km (12.4 mi.)

1,550 nm

2.5 Gb/s1,490 nm

1,310 nm

Splitters

V-OLT(EDFA)

P-OLT

ManagementSystem

Central Office or Headend

FiberDistributio

n

PassiveOutside Plant

1.2 Gb/s

RF Video

ONTs

WDM

HSI, DS-1VoiceIP Video

RF-Video Source


Outside Plant Parameters

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


Alliance

Feeder OSP Cable From

CO / Headend

Fiber Distribution Hub (FDH)

Splice Case

Splice Case

Distribution Cable

Distribution Cable

AccessTerminal

TAP- Terminal Access Point

Drop Cable

Drop Cable

ONT

ONT

FTTU Outside Plant

Similar to HFC OSP architecture


Operational and Maintenance Costs

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


HFC to PON: How to Transition?

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


GPON Replacing HFC in Field

SplittersReplace

active HFC node

V-OLT(EDFA)

Could reuse if power level is appropriate

P-OLTreplaces

CMTS

ManagementSystem

ONTs

WDM

(new)

HSI, DS-1VoiceIP Video

RF-Video Source

Splices, additional splitters or

homerun fiberDistribution fiber could be reused. Need

to size it correctly

during HFC build

Drop fiber to replace coax

drops


www.alcatel.com

2005 appa community broadband conference operating an hfc network? how is ftth in your future

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