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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 ?
HTF MI Recently Announced New Research Report Titled on Global and Regional GPON Technology Market.
GPON is a fiber optic network which provides connection from one point to multiple points.
The Edgecore ASGvOLT32 and ASGvOLT64 GPON OLTs will provide 32-ports and 64-ports respectively of GPON, with uplink ports of 2 x 100GbE and 8 x 25GbE.
The GPON technology allows to provide Triple Play (VoIP, Data and IPTV) fiber-optic cable services, and its high data transfer rate makes it possible to watch HDTV channels.
The hybrid solutions with GPON and DOCSIS technologies create a highly viable option for meeting the consumer demand for increasingly faster Internet connections and reliable, versatile services.
Through the statistical analysis, the report illustrates the global and Chinese total market of GPON industry including capacity, production, production value, cost/profit, supply/demand and Chinese import/export.
"VDSL2 is a logical alternative for supplying high bandwidth for large business customers and mobile backhaul networks in areas unserved or underserved by fiber, while GPON enables fiber to be utilized economically where it does exist," said Ulik Broida, RAD's Vice President of Marketing and Business Development.
The new GPON set-top boxes "give us visibility" into when a subscriber has a problem.
To date, du has converted more than 18,000 homes across several areas in Dubai to GPON. In addition to the conversions, du has provided GPON services to 22,000 totally new units.
Available in industrial-temperature grade, and with low typical power dissipation of 1.5w, the integrated GPON SFP ONU is well-suited for mobile small-cell backhaul applications.
GPON technology assures 2.488 Gbps of downstream bandwidth and 1.244 Gbps of upstream bandwidth.
The project is based on GPON (Gigabit Passive Optic Network) technology, which can provide the speed and bandwidth required for seamless services including voice over IP, high-speed Internet, and IPTV.