PON

(redirected from BPON)
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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 ?
* Broadband PON (BPON): the presently used name for APON which is based on ITU-T recommendations G.983.1 [13], G.983.2 [14] and G.983.3 [15].
The combined company will expand its PON transceiver product line to include the full suite of EPON, BPON, and GPON transceivers, allowing the company to participate across FTTH deployments globally.
WinPath2 provides optimized solutions for the markets addressed by WinPath1, such as DSLAMs, Access Routers, BPON systems, and wireless transport, but also addresses new market segments such as 3G wireless channel cards, GPON, WiMAX, multi-service provisioning platforms and multi-service access routers, the company claims.
ECI Telecom (NASDAQ:ECIL), a telecommunications solutions provider, announced its new family of standards-based indoor Optical Network Termination (ONT) devices for residences and businesses being served by Broadband Passive Optical Network (BPON).