fiber access FTTH

Optical FiberCommunication (FTTx) has long been seen as following the DSL broadband access market the most promising broadband access, common twisted pair to communicate with the different, it has a higher operating frequency, larger capacity (can according to user need to upgrade to 10-100Mbps the exclusive bandwidth), the attenuation is smaller, without strong electrical interference, strong anti-electromagnetic pulse capability, good security features.

Fiber opticbroadband communications (FTTx) includes a variety of forms of access, such as the common FTTP (fiber to the premises, FiberToThePremise), FTTB (fiber to the building, FiberToTheBuilding), FTTC (fiber to the curb, FiberToTheCurb), FTTN (fiber to the neighborhood, FiberToTheNeighborhood), FTTZ (fiber to the cell, FiberToTheZone), FTTO (fiber to the office, FiberToTheOffice), FTTH (fiber to the home or fiber to the home, FiberToTheHome) and so on.

FTTH is the best choice of optic fiber directly into the home.

For many home users, FTTH is the best choice, which can be in the form of optical fiber and optical network unit (ONU) connected directly to the home, a variety of fiber-optic broadband access in addition FTTD (fiber to the desktop, FiberToTheDesk) outside the closest form of optical access users. With fiber-optic broadband access formal generalization, should be noted that the current FTTH broadband access is not simply refers to fiber to the home, has been generally refers FTTO, FTTD, FTTN, and other forms of access FTTH .

Besides, readers in the understanding of FTTH, pay attention to the current common "FTTx + LAN (fiber + LAN)" broadband access solutions distinguish. FTTx + LAN is an implementation of "100Mbps to the district or building, 1-10Mbps to the home" broadband access solutions using fiber +5 twisted pair mode - switches and central office switches and optical network unit within a cell (ONU ) connected using category 5 twisted pair cabling within the cell, user access speeds up to 1-10Mbps. With FTTH this single family dedicated bandwidth solutions differ, FTTx + LAN bandwidth is shared by several users or family, when many users share, its bandwidth or broadband speeds it is difficult to be guaranteed.

EPON solution with good scalability, fiber to the home to achieve a variety of ways

EPON (Ethernet Passive Optical Network) is a new type of optical fiber access network technology, effective total uplink transmission bandwidth 1000Mbit / s, using multipoint structure, passive optical transmission, it can provide a variety over Ethernet business, combines the advantages of PON technology and Ethernet technology, with low cost, high bandwidth, scalability, and compatibility with existing Ethernet good, easy management features, in Asia, such as Japan, China and Its use wide.

And no matter what PON fiber-optic system consists of OLT (OpticalLineTerminal, Optical Line Terminal), POS (Passiveopticalsplitter, passive optical splitter / coupler POS), ONU (OpticalNetworkUnit, optical network unit) and network management system composed of three parts . And these portions by the ISP at the time of installation are laid installers, home users generally do not own their own conditions for its erection.

FTTH Layout scheme

On specific functions, OLT placed in the ISP central office is responsible for connecting, managing, and maintaining control channel. The maximum transmission distance between the OLT and ONU up to 10-20km above, OLT ranging set of features to test the logical distance between each ONU and OLT and ONU adjust accordingly to direct its signal transmission delay, so that different ONU distance signal transmitted can be multiplexed together at the OLT accurately. OLT device also typically includes bandwidth allocation, according to the needs of the ONU, OLT assigned by the specific bandwidth. And, OLT equipment with multipoint hub features, the following can be one OLT ONU with 32 (and which will be expanded), all ONU OLT below each shared by time division multiplexing 1G bandwidth, which can provide up and down each ONU line up to 1Gbps bandwidth.

POS passive optical splitter, which beam splitter or splitter, it is a passive connection OLT and ONU equipment, its function is to input (downstream) of the optical signal is distributed to multiple output ports, enabling multiple users to be able to share an optical fiber, which shared bandwidth; in the upstream direction, a plurality of ONU optical signals multiplexed into one fiber.

ONU generally have 1-32 Mbps port to connect a variety of network terminals

ONU is in the end-user client access to the corridor or switch devices using a single optical fiber by time division multiplexing passive optical splitter can be a plurality of ONU to OLT port data. As a result of multipoint tree topology, reducing the aggregation equipment investment, network layers and more clear. Most ONU device itself has a certain switch function, and its interface is the upstream PON interface, connected to the interface board of the OLT through the passiveoptical splitter by 1-32 Mbps downlink and even Gigabit RJ45 port, connect the different data devices, such as switches, broadband routers, PCs, IP phones, set-top boxes, to achieve rapid deployment multipoint.

How to set up a network at home

Usually the home side ONU FTTH equipment, most of them will provide at least 4 Mbps RJ45 interface for wired home has four LAN connections within the user's computer, it has been able to meet the family needs more machines to share Internet access. Besides, for the use of dynamic IP FTTH network, users can access their own at a switch or wireless AP to extend wired and wireless networks as needed.

The current broadband router can be the perfect support for FTTH access solution

For a fixed IP only provides a Fast RJ45 interface FTTH terminals, it can be extended through a broadband router or wireless router. When set, simply WEB setting interface of the router, find "WAN port" option, the WAN port connection type select "Static IP" mode, and then enter the IP address provided by your ISP in the following interface, subnet mask, gateway, and DNS address.

In addition, the user has purchased broadband router or wireless router, to its use as a switch or a wireless AP in FTTH networks, when setting note the following: To set up a wireless router to a switch or wireless AP to use, twisted pair from the ONU need to plug the device directly inserted in the mouth of any router LAN interface; in the router's administration page, open the default DHCP server function is disabled; the IP address of the router and the use of dynamic IP ONU equipment provided the same network segment.

Since the optical fiber access can provide an unlimited amount of bandwidth, fiber to thehome (FTTH) broadband era is called "king", it is the ultimate goal of broadband development. After the fiber to the home, the user's connection speed can be significantly improved once again, download a 500MB DVD movie only takes a few seconds for the fastest time, ten times faster than the current ADSL program number. With the decreasing cost of erecting FTTH, FTTH is moving from dream to reality.