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(Passive Optical Network) An optical point-to-multipoint access network. There are no optical repeaters or other active devices in a PON, hence the name "passive." PONs are designed for local loop transmission rather than long distance and serve to bring fiber closer to the customer in order to obtain higher speed. PONs began in 1995 when a group of telecom providers organized the Full Service Access Network group (see FSAN).

An optical line terminal (OLT) device resides in the telco central office or cable company head end. It generates or passes on SONET and DWDM signals via fiber to an optical network unit (ONU) in the field. The ONU provides the optical to electrical (O-E) and electrical to optical (E-O) conversion between the fiber and the copper wires that reach homes and offices in a "fiber to the curb" (FTTC) or "fiber to the neighborhood" (FTTN) scenario. When the optical line goes directly into the building for "fiber to the home" (FTTH), an optical network terminal (ONT) is used to terminate the fiber. Fiber to the home is also called "fiber to the premises" (FTTP).

APON (ATM PON) was the first passive optical network and uses ATM for transport. BPON (Broadband PON) includes APON, Ethernet and video transports. GPON (Gigabit PON), which uses the SONET GPF frame, is designed to be efficient for packets as well as TDM. BPON and GPON are the ITU-T G.983 and G.984 standards respectively. EPON is the IEEE Ethernet standard for PONs.

Passive Optical Networks
PONs provide a way to bring high-speed fiber networks closer to the customer in the local loop.

BPON     GPON     EPONITU-T    ITU-T    IEEEG.983    G.984    802.3(Mbps)            (Gbps)ClassesSupported    B,C      A,B,C   PX10/PX20**

 Downstream   155    1.25 Gbps    1.25
 Speeds       622    2.5  Gbps

 Upstream     155     155 Mbps    1.25
 Speeds       622     622 Mbps
                     1.25 Gbps
                     2.5  Gbps

   Maximum Number of ONTsBased on Class and DistanceODN CLASS    7 km    10 km    20 km

   Class A       16      13       6
   Class B       40      32      15
   Class C      101      81      39

  ** PX10 & PX20 are similar to B and C
References in periodicals archive ?
A passive optical network is basically a telecommunication technology that implements point-to-multipoint network under which single stack switch provides more than 7,000 IP voice, data and video network connections to an ethernet-based device or system The aim of the network is to provide a solution that is easy to install, maintain and upgrade.
Browse Passive Optical Network (PON) Market Report spread through 150 Pages at http://www.
An active system uses routers to manage signal distribution, but a passive optical network uses optical splitters instead of numerous routers and switch aggregators.
Gigabit-capable passive optical networks (G-PON) have a large and increasing base of support among telecommunications operators around the world.
TechNavio's analysts forecast the Passive Optical Network Equipment market in the APAC region to grow at a CAGR of 32.
TELECOMWORLDWIRE-15 February 2001-Quantum Bridge and Corning Cable team to deploy passive optical networks (C)1994-2001 M2 COMMUNICATIONS LTD http://www.
TechNavio's report, Passive Optical Network Equipment Market in the APAC Region 2010-2014, has been prepared based on an in-depth analysis of the market with inputs from industry experts.
Each two-and-a-half-day program consists of an in-depth course designed to help IT professionals gain a greater understanding of Passive Optical Network (PON) design and considerations.
Alloptic is a global leader in the development of Passive Optical Network (PON) technology.
Gigabit passive optical networks (GPON) build on a series of technology enhancements that extend and improve on earlier forms of passive optical networks (PON).
3ah Gigabit Ethernet Passive Optical Network (GEPON) chips that fully support low-cost, IPTV-triple-play services via optical fiber networks.
Teknovus delivers the only Gigabit Ethernet Passive Optical Network (GEPON) chipsets that fully support low-cost, IPTV-triple-play services via optical fiber networks.

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