GPON Network Composition

 by www.fiber-mart.com

GPON gadget consists of optical line terminal (OLT), optical community unit (ONU) and optical distribution community (ODN).

OLT is usually positioned in the CO (central office) desktop room, which is in general used to accumulate the optical alerts uploaded with the aid of ONU; ONU can be set in the corridor, the road and the user’s domestic in accordance to distinctive get admission to applications, presenting customers with a number get admission to interfaces (such as POTS interface of smartphone service, GE/FE interface of Internet service, etc.); ODN is composed of optical fiber, one or numerous passive optical dividers and different passive optical devices, with which optical channels ought to be furnished between OLT and ONU. OLT and ONU speak via ODN.

In GPON fiber optic network, OLT is a king of provider node aspect tools of get right of entry to network. It is linked to the corresponding carrier node gear thru SNI (service node interface) and entire the carrier get entry to of get right of entry to network. ONU is a king of consumer aspect gear of the get admission to network. It is linked to CPE (customer premises equipment) thru UNI (user to community interface).

Commander (OLT)
OLT is the core element of optical get admission to network, which is equal to L2 exchanger or L3 router of ordinary communication, and is additionally a multi-service platform. On the one hand, in order to transmit alerts to the cease user, it will collect the indicators carrying a number of offerings at the central workplace and ship them to the get entry to community in accordance to a positive sign format. On the different hand, it will ship the indicators from the quit person to a number provider networks in accordance to the provider types.

With one OLT, a couple of ONU can be linked via a splitter, and the control, administration and ranging features of ONU can be realized. OLT is like a commander, commanding these ONU soldiers, offering us with low priced and high-speed verbal exchange services, and connecting us on the earth extra carefully via light.

OLT consists of core layer, provider layer and public layer.
1. Core layer: presents aggregation, distribution, provider procedure and ODN adaptation functions
2. Service layer: gives carrier interface and offers with a number of offerings with negative quality.
3. Public layer: supply strength provide and protection functions

Soldier (ONU)
ONU and OLT are used collectively to understand the two-layer and three-layer features of Ethernet, and supply voice, records and multimedia offerings for users.

The principal features of ONU include:
1. Receive statistics despatched through OLT
2. Respond to the administration order issued by way of OLT and make corresponding adjustment
3. Cache the Ethernet facts of customers and ship it to the upline route in the sending window allotted via OLT
4. Other consumer administration functions

Huawei ONU gear includes MDU and ONT. MDU is generally positioned in the avenue cabinet, corridor, etc.; ONT is normally positioned in the user’s home.

Optical transmission channel ODN
ODN is an optical cable community based totally on PON equipment. It may want to set up optical data transmission channel between OLT and ONU, and reap the statistics transmission and distribution feature between OLT and ONU.

ODN is divided into two factors and three sections from the workplace to the user. Two points refer to optical distribution factor and optical get admission to point, and three sections respectively refer to feeder cable, distribution cable and indoor cable.