PON

(redirected from BPON)
Also found in: Acronyms.

PON

(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, BPON, EPON and GPON
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 ?
By implementing this patent in our flagship BL2338 SoC, we are enabling carriers to migrate from BPON to GPON without spending extra money and manpower," said Didi Ivancovsky, Founder, VP Marketing of BroadLight.
The Node+Zero joins Hitachi's AMN 1200 BPON and AMN1220 GPON systems on the RUS List of Materials Acceptable for Use on RUS Financed Projects in category "ae", "Access Equipment".
November 2003 First major RBOC selects General Bandwidth for BPON deployments
The company's completely integrated product line consists of standards-based communication semiconductors and software solutions that enable its customers to deliver BPON and GPON equipment to carriers and services providers worldwide.
The 700GX ONT family employs Calix' unique auto-detect technology, first introduced to the industry's broadest portfolio of ONTs in 2007 to enable Calix customers to deploy BPON or GPON over the same ONT.