Convergence Access Networks Challenge Gpon
Upcoming SlideShare
Loading in...5

Convergence Access Networks Challenge Gpon



A Presentation introducing GPON for an Access Network resulting to the myth of Fixed Mobile Convergenc e.

A Presentation introducing GPON for an Access Network resulting to the myth of Fixed Mobile Convergenc e.



Total Views
Views on SlideShare
Embed Views



7 Embeds 117 62 26 14 10 3 1 1



Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.


13 of 3 Post a comment

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
  • very good
    Are you sure you want to
    Your message goes here
  • very nice
    Are you sure you want to
    Your message goes here
  • well
    Are you sure you want to
    Your message goes here
Post Comment
Edit your comment

    Convergence Access Networks Challenge Gpon Convergence Access Networks Challenge Gpon Presentation Transcript

    • ADVANCED ACCESS NETWORK’S THE CONVERGENCE CHALLENGE (An Introduction to GPON) Qasim Y. Khan Fixed Mobile Convergence Discussion Group LinkedIN
    • Multiple technologies? High CAPEX? High OPEX? Low Band? High power consumption? Space? Spares?
    • Currently deployed telecom access network solutions are mostly TDM-based (for narrowband traffic, e.g. legacy (telephony (ATM-based (broadband traffic, e.g. ADSL The result isa gap between access network technology and service evolution trends ? When and how to upgrade AN
    • The Choices for Fiber Access • There are 2 choices for Fiber Access: – Point to Point – Point to Multi-point • Point to Point is sometimes called Active Ethernet • Point to Multi-point is called PON (passive optical network) Active PON Ethernet OLT Switch Passive Splitters ONT #1 #1 ONT ONT #1 #1 ONT ... ONT#192 ONT #1 ONU #1#1 ONT ONT #1 ... ONU#192
    • The Choices for Fiber Access PON is analogous to wireless telephony (cellular) Active Ethernet is analogous to wireline telephony Active PON Ethernet OLT Switch Passive Splitters ONT #1 #1 ONT ONT #1 #1 ONT ... ONT#192 ONT #1 ONU #1 #1 ONT ONT #1 ... ONU#192 Both CapEx and OpEx cost savings favor PON
    • ????????? Fib er Active N Ethernet PO GE FTTC / VDS L N G PO
    • Passive Optical Network • No active electronics in the access network • Shared fibre to the splitter • Shared exchange equipment (OLT line card) • Encryption prevents eavesdropping on downstream traffic Optical Telephone Splitter Network Unit Exchange 1:32 ONU Fibre Optical Line Terminal, OLT 8
    • PON A SIMPLE VIEW • In a PON system, a single fiber connects multiple customers toa single transceiver at the central office (CO). • The single fiber is split, using a passive optical splitter, to serve up to 32,64 soon 128 customers. • Not only does PON reduce the amount of fiber required, but a single transceiver serves multiple customers instead of requiring one per customer.
    • PON advantages shared infrastructure translates to lower cost per customer • minimal number of optical transceivers • feeder fiber and transceiver costs divided by N customers • greenfield per-customer cost similar to UTP passive splitters translate to lower cost • can be installed anywhere • no power needed • essentially unlimited MTBF fiber data-rates can be upgraded as technology improves • initially 155 Mbps • then 622 Mbps • now 1.25 Gbps • soon 2.5 Gbps and higher
    • Types of PON Downstream Upstream 1490 nm 1310 nm BPON Broadband PON 622 Mbit/s 155 Mbit/s EPON Ethernet PON 1 Gbit/s 1 Gbit/s GPON Gigabit PON 2.5 Gbit/s 1.25 Gbit/s 10G- 10 Gbit/s EPON 10 Gbit/s 1/10 Gbit/s EPON Due 2010 WDM- Wavelength division No standard No standard PON multiplexed PON 1 wavelength 1 wavelength per premises per premises Dedicated fibre unlimited unlimited 11
    • What are PONs, BPONs, and GPONs? • Passive Optical Networks (PONs) Attributes – Fiber Access Technology with no active elements (i.e. electronic elements that require no power) in the outside plant. – Uses Passive optical splitters to distribute traffic to the customers. – Consists of an Optical Line Terminator (OLT) located at the CO and many Optical Network Terminals (ONTs) located at the customer’s premise. • Broadband PON (BPON) Attributes – Based on mature ITU-T G.983 series standards – Provides up to 1.2Gbps Downstream and 622 Mbps Upstream capacities – Provides a separate wavelength for downstream video transmission • Gigabit Capable PON (GPON) Attributes – Based on ITU-T G.984 series standards that are in progress – Provides up to 2.5 Gbps capacities for both Downstream and Upstream – Provides more efficient transport for data traffic
    • PON standards 2006 2488 GPON 1244 EPON Downstream 622 (Mb/s) BPON 155 155 622 1244 2488 Upstream (Mb/s)
    • GPON
    • GPON Definition A Gigabit Passive Optical Network (GPON) provides direct support of TDM and Ethernet traffic in their native formats using the Giga- bit Encapsulation method (GEM.) GPON also supports all Ethernet protocols as wells as VLANs, quality and class of service, IGMP and other layer 2+ mechanisms required to accommodate various IP-based services. GPON typically uses the Advanced Encryption Standard (AES) for security purposes.
    • GPON Benefits • Supports Gigabit or above data rates on the PON • Optimizes the physical layer for – Higher data rates for BW intensive applications (e.g. IP Video) – Greater Distance - reach more customers from the CO – More Splits - Reach more customers from a single PON • Offers a more bandwidth efficient protocol for data centric services • Has the capability to support multiple services in their native formats. –ATM –Packet (e.g. Ethernet) –TDM
    • The ITU and FSAN • In the late 1990’s a “Clandestine” group of operators was formed: – Objective: “Global Domination of the Fiber Access Market” – The group called itself FSAN The FSAN Committee • FSAN stands for Full Service Access Network • Loosely affiliated with the ITU • Develops all PON standards prior to submission to the ITU • FSAN membership consists of both operators and vendors • But operators make all final decisions • Membership of vendors is tightly controlled by FSAN Operators
    • STANDARDS PON standards SETTING BODIES • FSAN - Full Service Access Network is an organization for standardizing APON, BPON, and GPON in ITU-T G.983.x – FSAN composed of major telco operators worldwide – Standards have been written and are mature – Enhancements continue to be made – Standardized products have begun to enter market • IEEE - Ethernet in the First Mile (EFM) study group is currently working on standardizing EPON – Standards work is ongoing – Initial draft planned by end of 2003 – Comprised primarily of vendors with some operator participation
    • The IEEE • IEEE well known Protocols – 802.3 Ethernet – 802.11 WiFi – 802.16 WiMAX • IEEE Membership is diverse – System vendors, chip vendors, optics vendors, industry cunsultants and academia • IEEE Voting – Each member gets one vote – No limit to the number of votes from a given company • “Personality” of IEEE standards reflect interests of Vendors – Often leads to low-cost solution – Often only hits 80% of market – Often doesn’t produce migration strategy • IEEE standards don’t necessarily reflect Operator Preferences
    • The ITU • ITU well known Protocols – SDH – V 5.2 – ISDN – VoIP protocols H.248 and H.323 • ITU Membership – Membership controlled by ITU Member-Countries – Membership open to Operators, Institutions, and Vendors • ITU Voting – Voting is through consent – Each company get one vote – Companies can object (but can’t stall process) • “Personality” of ITU standards reflect interests of Operators – Addresses the operator requirements – Addresses the operator constraints – Addresses the service provider’s operational models – Not focused solely on low cost – Duration of Standardization Process relatively short
    • Standards Comparison ITU (GPON) IEEE (P-P & EPON) Mission/Objective Full Service Access Network Ethernet in the First Mile (EFM) (FSAN) Attendees Service Provider focused Enterprise and consumer market focused Committee Operating Protocol Carriers drive and approve One person- One vote vendors technical recommendations Wavelengths Specified Specified Maximum PON Speeds 2.4 Gb/s 1.25 Gb/s Bandwidth efficiency Greater than 90% Less than 75% Attenuation Range 25 dB 24 dB QoS Specified Left to vendor Network synchronization Specified Left to vendor Security Specified Left to vendor
    • Major Members Of Full Service Access Network (FSAN) FSAN Recommends Standards to the International Telecommunications Union (ITU)
    • All over the world operators go for PON - PON subscribers will dominate PTP subscribers 60.000 Subscribers (000) Worldwide fiber deployments 50.000 40.000 PON 30.000 P2P 20.000 10.000 - 2006 2007 2008 2009 2010 2011 2012 Source: Broadband trends, 10/2007
    • GPON System Architecture SFU G-Light Residential GigE IP 2.4 MDU 1.2 G-Light 10GigE GPON Splitters 1:8 1:32 GigE 1:64 TDMoP SBU GW G-Light TDM: STM E1, -1, Business TDM MTU G-Light OLT ODN ONUs/ONTs MTU – Multi Tenat Unit SBU – Small Bussiness Unit MDU – Multi-Dwelling Unit - apartment buildings SFU – Single Family Unit
    • GPON technology introduction Central Office or Fiber Passive Remote Terminal Distribution Outside Plant 20 km (12.4 mi.) AWS/WAM 7342 P-OLT Splitters 1,490 nm 2.4 Gb/s 1,310 nm 1.2 Gb/s > Voice, data and video (bi-directional) for 32 (or 64) subscribers over a single fiber > 2.4/1.2 Gb/s data rate over two wavelengths > Up to 20 km (12.4 mi.) span > GEM (packet) based encapsulation on the PON. > In band video support. > FSAN standards compliant OLT and ONT system
    • The Market Opportunities for GPON • There are Numerous Market Opportunities for GPON – Lower OpEx – Greater Service Offering – Future-proof investment • The real question is When and Where does it make economic sense to deploy GPON • The quickest application appears to be the Developer Market and ‘Smart FTTH’ Communities
    • PON Fiber in the Access
    • PON Network Splits Single Fiber Link Into Individual Links to Subscribers
    • T The FTTH Access Network – OLTs In The Central Office, ONUs in CPEs h e F T T H A c c e s s N e t w o r k
    • Consumer’s BandWidth Requirements Met by FTTH Web Surfing Video Conferencing, Premises Surveillance GPON are premium for ALL services!!! SDTV VOD, Telecommuting File Sharing, Home Video Sharing/Streaming Real Time SDTV, Network PVR VDSL2 can cover even Multi-Player Gaming, Interactive Distance Learning the HDTV service ! Premises Web Hosting Telemedicine ADSL2+ can cover the Large File Sharing Triple-play service HDTV VOD bandwidth requirement. Next Hosted Applications & Storage FTTH (per sub) VDSL2 ADSL2+ Cable Modem Dial-up Upstream 150 100 25 20 10 5 0 5 10 15 20 25 100 150 Downstream Mbps
    • Comparison of DSL, Cable and FTTH Technology Bandwidth
    • GPON – RIGHT CHOICE FOR UAN FIXED ACCESS CORE Premise Mobile Wimax VPN CPE Houses / Villas Local Exchange IMS Flats IP/MPLS Internet IP-TV 2G / 3G BTS VoD Edge Node Flats Access Node Passive splitter Office Fiber building
    • FTTH Fixed Access Network Architecture. Fixed Access Development - Overview
    • Challenge: Conflict of Backhaul Bandwidth Requirement & Cost Mobile Broadband Backhaul • Mobile broadband developing leads to bearing bandwidth increase 50 times, and the cost of backhaul will increase 10 times. • Data service consume more bandwidth but bring less revenue per bit in mobile broadband era. Leased Line Cost R e g io n E1 • How to reduce the backhaul cost is N o r t h A m e r ic a 4 0 0 U S D /M o n t h a big challenge for mobile operator. Eu ro p e ( B T ) 7 0 0 ~ 1 9 5 0 E u r o /M J a p a n ( E m o b ile 1 1 0 0 U S D /M o n t h ) • LL cost according to distance & bandw idth • Exclude Installation fee, according to existing cable & office, charge from 700 to 60000Euro
    • GPON Backhaul Solution – Native TDM MGCF MGW ONT BSC IP CSCF BTS SDH Core OLT GMSC ONT RNC SGSN NodeB MSC • Voice and data flow offload from BTS/NodeB. • OLT forward voice flow to SDH network and data to IP network. • Clock delivered from SDH network through GPON line to BTS/NodeB. • Suitable for operators to reuse SDH network and develop IP network to carry increasing data traffic.
    • GPON Backhaul Solution – ALL IP MGCF MGW PTN BSC IP ONT BTS Metro Core CSCF Ethernet OLT GMSC PTN RNC SGSN ONT TDM Pseudowire MSC NodeB • Suitable for operators to deploy ALL IP backhaul network, and access residential / enterprise subscribers together. • TDM PWE3,Core and aggregation network is IP,GPON Native TDM mode to carry legacy service. • Smoothly upgrade from Native TDM solution (SDH) without replacing ONT
    • Synchronization for GPON Backhaul – Option 1 Offload scenario, Distribute clock through SDH network Distribute clock through CBU recover clock and deliver to NodeB/BTS Synchronous Ethernet or through E1/BITS or E1/STM-1 to Aggr GW synchronous Ethernet BSC NodeB N*E1 E1 N*E1/ OLTSTM-1 SDH ONT ATM GPON STM-1 FE RNC 10GE Reference BTS GE E1 clock IP OLT use the clock as Input clock to RNC/ OLT distribute clock system clock BSC through GPON line SDH deliver the Clock synchronization signal to OLT. Saving the investment by reuse existing SDH network. No need any change within the whole network It is the most suited clock solution currently as this is readily available in the network.
    • Synchronization for GPON Backhaul – Option 2 BITS/SDH N*E1 BTS/NB E1 BSC ONT TDM N x E1 /ch-STM-1 Fiber IP/MPLS Metro FE/GE/ BTS/NB 10GE 10GE /ATM STM-1 ONT OLT PTN RNC PE-Agg POP Gateway LTE ONT Clock D/R WIMAX  Using IEEE 1588v2 for the synchronization  This requires the whole network to support IEEE 1588v2  It will be the future option for mobile backhaul.
    • ITU-T G.984 standard for GPON reliability-Type B Enterprise A Telco site Eth Switch SBU LAN Type B Protection OLT MSTP Business Enterprise B Cloud 2 protected points LAN
    • ITU-T G.984 standard for GPON reliability-Type C Enterprise A Telco site Type C Protection Eth Switch SBU 5 protected points OLT LAN Business Enterprise B MSTP Cloud LAN
    • When required? Add more protection between splitter and SBU or MDU Also Provide dual homing to two different OLT. No big difference with Type B.
    • GPON system security solution AES AES Internet • Line encryption technology • System security AES (Advanced Encryption Standard)128 • VLAN isolation • MAC filter • ACL Security • Anti DOS • User security authentication • Anti MAC/IP/ARP/DHCP • RADIUS • Network security • SSH • User security • SNMP v3 • DHCP Option 60/82
    • GPON encryption OLT encrypts using AES-128 in counter mode Only payload is encrypted (not ATM or GEM headers) Encryption blocks aligned to GTC frame Counter is shared by OLT and all ONUs – 46b = 16b intra-frame + 30 bits inter-frame – intra-frame counter increments every 4 data bytes • reset to zero at beginning of DS GTC frame OLT and each ONU must agree on a unique symmetric key OLT asks ONU for a password (in PLOAMd) ONU sends password US in the clear (in PLOAMu) – key sent 3 times for robustness OLT informs ONU of precise time to start using new key
    • PON architecture PONs Slide 46
    • Terminology like every other field, PON technology has its own terminology • the CO head-end is called an OLT • ONUs are the CPE devices (sometimes called ONTs in ITU) • the entire fiber tree (incl. feeder, splitters, distribution fibers) is an ODN • all trees emanating from the same OLT form an OAN • downstream is from OLT to ONU (upstream is the opposite direction) downstream upstrea NNI m Optical Distribution Network Optical Network Units cor e splitter Optical Line Terminal UNI Optical Access Network Terminal Equipment PONs Slide 47
    • PON principles (almost) all PON types obey the same basic principles OLT and ONU consist of • Layer 2 (Ethernet MAC, ATM adapter, etc.) • optical transceiver using different λs for transmit and receive • optionally: Wavelength Division Multiplexer downstream transmission • OLT broadcasts data downstream to all ONUs in ODN • ONU captures data destined for its address, discards all other data • encryption needed to ensure privacy upstream transmission • ONUs share bandwidth using Time Division Multiple Access • OLT manages the ONU timeslots • ranging is performed to determine ONU-OLT propagation time additional functionality • Physical Layer OAM • Autodiscovery • Dynamic Bandwidth Allocation PONs Slide 48
    • Why a new protocol ? downstream PON has a unique architecture upstrea • (broadcast) point-to-multipoint in DS direction m • (multiple access) multipoint-to-point in US direction contrast that with, for example • Ethernet - multipoint-to-multipoint • ATM - point-to-point This means that existing protocols do not provide all the needed functionality e.g. receive filtering, ranging, security, BW allocation PONs Slide 49
    • Advantages of Gpon • Speed • Flexibility • Responsivness • Interoperability
    • Interoperability
    • COMPARISON OF PON WITH OTHER BROAD BAND ACCESS TECHOLOGIES (DSL,VDSL, cable/modem) ADVANTAGES • These include a long-term life expectancy of the fiber infrastructure, • lower operating costs through the reduction of “active components, support for greater distances between equipment nodes • most importantly, much greater bandwidth. DSL-certain megabits per sec, FTTH pon 1 to 2.5Gbps
    • • Since Pon uses only passive components it has low power requirements less no of technicians cost savings up 40 t0 60% Savings mainly result from lower customer contacts associated with service orders and trouble reporting, outside plant operations, central office operations, and network operations. • It provides high bandwidth for high-speed Internet access, video on demand,IPTV and voice over IP (VoIP) .
    • An illustration of an Ideal Access Network for Convergence Fixed / Mobile Applications
    • CLOSING REMARKS ICT Infrastructures are best delivered with GPON FTTH technologies Increasing Bandwidth Demand required Platforms with Long Term Readiness and can deliver higher bandwidth today. Convergence will remain a myth without Interoperable lower OPEX Access Platforms. GPON offers more services over a single Access Network with lower Fiber Cost and Long Term Readiness. Incumbents are upgrading on GPON and new Carriers are evaluation more diverse revenue opportunities from GPON.