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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 ?
The standards are intended to allow vendors, network operators and independent testing facilities to achieve consistent results when testing EPON equipment for conformance with IEEE 1904.
Recall back the architecture of EPON is point to multipoint.
The BCM55524 quad OLT is designed to work in tandem with Broadcom's award-winning StrataXGS[R] aggregation switch series, combining feature-rich EPON and proven Carrier Ethernet performance in an end-to-end solution that meets the scalability, reliability, cost, and advanced feature set requirements of next generation FTTx deployments.
UTStarcom's EPON solution helps electric companies build high-quality and reliable communication channels.
The absence of this support within EPON equipment means businesses must look elsewhere for fractional, leased line or private line T1/E1 access.
Teknovus has shipped more than one million EPON ports to more than twenty original equipment manufacturers (OEMs) in Asia, North America, and Europe, with sales on a dramatic, annual upward trend.
Alcatel-Lucent s new EPON solution will help MSOs meet this demand more cost-effectively, allowing them to capture a far greater share of the growing business services market.
3ah EPON engine supporting multiple logical links, along with an EPON SERDES, two Ethernet PHYs, integrated buffers, and an embedded processor for management in a single package.
Source Photonics introduces the 10G EPON symmetric OLT transceiver in XFP form factor.
TELECOMWORLDWIRE-8 April 2009-China Telecom implements ZTE's EPON solution(C)1994-2009 M2 COMMUNICATIONS LTD http://www.
Transitioning from EPON to 10G-EPON allows carriers to connect up to 10 times more subscribers per Optical Distribution Network (ODN), reducing OPEX and CAPEX per subscriber.
In other regions worldwide, such as Russia, the Middle East, Mexico, Brazil, and the rest of Asia, EPON and GPON penetration continues to grow, according to Ovum.