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Understanding GPON By Adnan Umar PTCL Academy Objectives • At the end of this module participants will be able to: – List the benefits of FTTH – Understand the PON – Understand the GPON architecture – Describe the key features of GPON 2 PTCL Academy Copper Based Access Networks • Optimized for a single service • Can support data rates 20+Mbps • Future demand for next generation services is 40+Mbps PTCL Academy Source: PTCL Academy Think of a technology --- having • • • • Unlimited bandwidth Future proof Long distance coverage Can support bandwidth hungry multimedia services over IP – i.e. VOIP, HDTV, VOD, access to HSI etc. involving • (voice + video + data) – All services via bundle offering PTCL Academy FTTH 100 % fiber in AN PTCL Academy FTTH? Copper // Fiber CO/HE CO/HE // Old networks, optimized for voice 24 kbps - 1.5 Mbps CO/HE // Optical networks, optimized for voice, video and data PTCL Academy 19 Mbps - 1 Gbps + FTTH – 100% Fiber Network • “An OAN in which the ONU is on or within the customer’s premise.” – OAN: Optical Access Network – ONU: Optical Network Unit (CPE) – OLT: Optical Line Termination OAN CO/HE // OLT Source: www.ftthcouncil.org ONU PTCL Academy FTTH Active Network OLT // ONU // // Processing (powered) 9 PTCL Academy FTTH Passive Optical Network OLT // // // // // Optical splitter // 1x16 (1x2, 1x8) 1x32 (1x4, 1x8) 10 PTCL Academy Hybrid Networks OLT // // // // // // Processing (powered) // Optical splitter // PTCL Academy FTTH network realizations • • • Active networks – Subscribers have a dedicated fiber optic strand – May use active (powered) nodes to manage signal distribution All passive network – Shares fiber optic strands for a portion of the networks distribution – Uses optical splitters to separate and aggregate the signal – Power required only at the ends Hybrid networks – Literal combination of an Active and a PON architecture PTCL Academy FTTH Standards 13 PTCL Academy FTTH - STANDARDS • ITU-T G.983 – • • • • APON (ATM Passive Optical Network). First Passive optical network standard. Used primarily for business applications was based on ATM (Asynchronous Transfer Mode) Initial offering 155.52 Mbps Downstream, 155.52 Mbps upstream. – BPON (Broadband PON) • Standard based on APON architecture. • It adds support for WDM, dynamic and higher upstream bandwidth allocation. 14 PTCL Academy FTTH – STANDARDS -cont • ITU-T G.984 – GPON (Gigabit PON) • • • • 15 An evolution of the BPON standard. Supports higher rates, Enhanced security, GPON uses IP-based protocols to transfer data. PTCL Academy FTTH – STANDARDS-cont • IEEE 802.3ah – – – EPON or GEPON (Ethernet PON) is an IEEE/EFM standard for using Ethernet for packet data. There are currently over 15 million installed EPON ports. EPON uses IP-based protocol to transfer data. - 1.25 Gbps Symmetrical. 16 PTCL Academy