FTTH,FTTH系統(tǒng)結(jié)構(gòu)組成詳細(xì)介紹

1. Definition of FTTH
A network that supply of bandwidth equivalent to 50~100Mbps per household is possible and function of QoS(Quality of Service) is available in service aspect, and that optical fiber was established up to the household in physical aspect.

FTTH Composition Diagram

*QoS: Quality of Service
*C Central Office
*OLT: Optical Line Terminal
*ONT: Optical Network Terminal

2. Composition Overview of FTTH Network
FTTH technology, which epochally increases transmission speed of the subscriber net by use of optical fiber, can generally divide by Home Run, AON and PON.
Home Run: Optical subscriber net is composed of optical fiber only
AON(Active Optical Network): Optical subscriber net is composed of active component(optical switch, media converter etc) where electricity is required.
PON(Passive Optical Network): Optical subscriber net is composed of passive component(optical splitter, multiplexer etc) where electricity is not required.

Embodiment Method of FTTH



1) Home Run(Point to Point) Method

????? Home Run Method, one piece of optical fiber being connected from the CO(Central Office) to the subscriber by point to point, can be deemed the simplest method.

2) AON Method
AON Method is the one to post a RN that accepted a active component to carry out Ethernet switching function on a proper position within subscribers area, let us say, Cabinet, Shelter, CEV or Electric Pole, from which connect to the each subscriber through optical fiber. At this time the connecting section from the CO to the RN is connected through a single optical fiber.

3) TDM-PON Method
TDM-PON Method can be divided by ATM-PON, Ethernet-PON, G-PON etc, and is the method to select and receive a signal only transmitted to him/her from the ONT(Optical Network Terminal), once the CO(Central Office) broadcast a signal to all subscribers, meanwhile the signal to be sent from the subscriber to the CO is to use respective protocol then time-division multiplexing access.

5) Features of FTTH by Composition Method

3. In-house Communication Line facility

1) Inlet Line(inlet wiring line)
It is comprised of cable, connection material, over-current?overvoltage protector, box object and plumbing facility etc necessary to connect/join outdoor line facility and in-house line facility, and is located at a diverging point between communication business entity and user.

2) MDF Room(concentrated in-house communication room)
It is a place wherein major distributing board and subsidiary facility are installed, and exchange facility, optical terminal device, switch for data and power supply facility for communication are installed, operated, and is distinguished in terms of scale and function of the facility from communication room which is installed at each building or floor.

3) Backbone Line(backbone wiring line)
Normally it is comprised of, in-house backbone line to connect DDF room and building communication room of each building, building backbone line to connect intermediary terminal box of floor communication room or in-between floor from building communication room of each building.

4) Building Communication Room
Each building of the apartment residence get installed the building communication room to switch, receive the inlet cable distributed from MDF room. In the building communication room a terminal board or building terminal box can be installed for switching connection of the inlet circuit and optical distribution box is installed in the outlet that the optical cable is entered. Also equipment such as a switch hub to receive a data circuit, and passive component, passive device, power supply facility for other information communication service and facility necessary for environmental management of communication room etc can be installed.

5) Floor Communication Room
It, a communication room normally installed by each floor of a building, means an exclusive information communication space to install inlet and outlet terminal of communication cable and distributing board, optical terminal device, ???, hub CATV distributor, power supply facility and subsidiary facility communication.

6) Backbone Line(backbone wiring line)
Normally it is comprised of, in-house backbone line to connect MDF room and building communication room of each building, building backbone line to connect intermediary terminal box of floor communication room or in-between floor from building communication room of each building.

7) Horizontal Line(horizontal wiring line)
It is comprised of, wiring space from intermediary terminal box installed at floor communication room or in-between floor to outlet box located at office of each floor or room of each household, wiring cable etc.

8) Household Terminal Box
Household Terminal Box means a terminal box to be installed a exclusive space of user to efficiently distribute?connect communication line entered into within the household or wiring of general cable facility etc.

9) End Wiring Line
It means a wiring sphere from the outlet box located at the wall surface or office floor to the user terminal of telephone, PC etc, and various cord connects from outlet to each terminal.

4. Material and Equipment to Compose FTTH
?? 1)????



????= optical cable, ???= for indoor, ???= ordinary type, ???= ribbon type, ???= air pressure, ??????= optical tube cable, ???= for outdoor, ???= ordinary type, ???= ribbon type, ???= air pressure, ??????= optical tube cable
? Optical Cable Structure for Loose Tube and Dry Core
???(250?m)= optical fiber, ????= filling jelly, ??= tube, ?? ???(??)= tensile strength string of center(steel core), ?????= waterproof tape, ?????= exterior tensile strength string, ????= exterior sys
? Ordinary Type Distribution Cable for Indoor
???= optical fiber, PVC ??= PVC coating, ???? ?(??/???)= aramid yarn(??/tensile strength string), ??= sys

2)UTP(Unshielded Twisted Pair) Cable
?? UTP Category5e 4Pair Cable
?? Connects from the photoelectric transformer of household to the outlet, and connects from the outlet to the terminal.

UTP Category3 4Pair Cable
uses for voice.

3) Fiber Distribution Frame (FDF)
Fiber Distribution Box is meant to say a optical line conduit connection material which can be installed, operated at the concentrated in-house communication room, building communication room etc so as to carry out functions of connection, distribution and switching of optical subscriber transmission device or between intermediary terminal and exterior optical line conduit. Fiber Distribution Box should be a structure easy to treat with other remaining strings in terms of connection, distribution and storage etc according to fusion connection application of optical connection of on-site assembly type and existing optical jumper cord, and the minimum allowable bend radius of the optical fiber should maintain over 30mm.



4) Concentrated In-House Communication Room(MDF)
It is a place wherein major distributing board and subsidiary facility are installed, and exchange facility, optical terminal device, switch for data etc and power supply facility for communication are installed, operated.

5) Building Communication Room
At the each building of the apartment residence the building communication room is installed to switch, receive the inlet cable distributed from the concentrated in-house communication room.

6) Household Terminal Box
Household Terminal Box is meant to be installed at a exclusive space of the user so as to efficiently distribute connect the communication line conduit entering into the household or wiring of the general cable facility etc.

* ????= building terminal box, ??= living room, 110??= 110 block, ?= room, ????(data)= optical cable(data), ??????= optical conversion device, ???????= earthing-type power supply facility

7) Optical Outlet
Optical Outlet, a in-house communication net termination system to be directly connected into the monitor of the user within the household by cable, should be small and its bend radius should maintain at 25mm. And it should not only accommodate a various optical connector but also be a structure to protect for the optical connector of outlet box from outside.

* ????= treatment of remaining strings, ????= optical connector, ?????= household terminal box