Something about PON: GPON OLT ONT and EPON OLT ONU

In recent years, Fiber to the Home (FTTH) has started to be taken seriously by telecommunication companies around the world, and enabling technologies are being developed rapidly. There are two important types of systems that make FTTH broadband connections possible. These are active optical networks (AON) and passive optical networks (PON). By far the majority of FTTH deployments in planning and in deployment use a PON in order to save on fiber costs. PON adn has recently attracted much attentions due to its low cost and high performance.

AON vs PON

Downstream traffic in active (top) vs. passive optical network

In contrast to AON, multiple customers are connected to a single transceiver by means of a branching tree of fibers and passive splitter/combiner units, operating entirely in the optical domain and without power in PON.

PON includes EPON and GPON. They have the most popular versions of PON application at present. They have a similar or even said the same topology, but the protocols and chipset are quite different. EPON is a native Ethernet solution that leverages the features, compatibility and performance of the Ethernet protocol, while GPON leverages the techniques of SONET/SDH and Generic Framing Protocol (GFP) to transport Ethernet.

Real-World PON

A PON consists of a central office node, called an optical line terminal (OLT), one or more user nodes, called optical network units (ONUs) or optical network terminals (ONTs), and the fibers and splitters between them, called the optical distribution network (ODN). "ONT" is an ITU-T term to describe a single-tenant ONU. In multiple-tenant units, the ONU may be bridged to a customer premises device within the individual dwelling unit using technologies such as Ethernet over twisted pair, G.hn (a high-speed ITU-T standard that can operate over any existing home wiring - power lines, phone lines and coaxial cables) or DSL. An ONU is a device that terminates the PON and presents customer service interfaces to the user. Some ONUs implement a separate subscriber unit to provide services such as telephony, Ethernet data, or video.

• Optical Line Termination (OLT):
  An OLT provides the network-si de interface of the OAN and is connected to one or more ODNs.
• Distribution Network (ODN):
  An ODN realizes the optical transm ission from the OLT towards the users and vice versa. It utiliz es passive optical components.
• Optical Network Unit (ONU):
  An ONU provides (directly or remo tely) the user-side interface of the OAN and is connected to the ODN.
• Optical Network Termination (ONT):
  An ONT is an ONU used for FTTH th at includes the User Port function.

E/GPON/ODN Splitter Series

• GPON OLT/ONT: which designed as residential gateway with VoIP, CATV and WiFi function to provide triple play services for fiber to the home network. GPON ONT product compliant with ITU-T G.984.1/2/3/4, with up to 2.5Gbps downstream and 1.25Gbps upstream.
• EPON OLT: An all-in-one access platform that provides integrated access, Fiberstore EPON OLT Series helps simplify network architecture and enable seamless migration in FTTx network.
• PON Splitters: With features like high reliability, low insertion loss, PON splitters are available with 1x2, 1x3, 1x4, 1x5, 1x6, 1x8, 1x12, 1x16, 1x18, 1x20 and 1x24 configurations with single mode or multimode fiber and we offer all type connectors of pre-connectorized like SC, FC, ST, LC and E2000 etc.
• EPON ONU: Fiberstore's EPON ONU is developed by FH-net Optoelectronics based on the Gigabit GPON technology, has a high cost performance.

PON offers particularly attractive performance, efficiency and TCO advantages. Knowledge about PON is far more than these we have mentioned. For more information about PON knowledge, just keep your attention on our blog. Of course, if you are planning to purchase the PON equipment, such as EPON OLT, EPON ONU, GPON OLT, or GPON ONT etc., welcome to visit fiberstore.com.

References:

ABC of PON: Understanding OLT, ONU, ONT and ODN