Internet communications “last mile” refers to the connection between the user’s computer terminal equipment from the engine room of the communications service provider switch.
Users involved in the “last mile” refers to the user in a network terminal status of the family and the individual user or small business usr, rather than the large commercial users or professional communications company, therefore, the connection between the service providers and the users of the line is not single-mode fiber optic backbone network usually used.
“Last mile” problem related to their location in the user’s computer terminal equipment cabling, because each user has room of difference, communication servic providers, real estate developers and users need to be considered according to the actual situation user equipment connected to the network, how to migrate to other locations and how to log off the user service.
Optical fiber because of its communication bandwidth, low loss, high fidelity, strong anti-interference ability and other advantages to become the first choice of the means of transmission of
the communication network, existing communications network backbone communication part of the basic fiber have achieved, in recent years fier prices constantly diving, laying of optical fibe costs have been declining, leading fiber access directly to the end-user terminals as possible. FTTH in the developed world has begun to spread.
In modern intelligent building internal office environment, computer networks are widely used, especially Ethernet LAN technology as the core technology, accounted for most of the market. Node, the number of ports in the various networks, more and more, the transmission speed is increasingly faster. 10Mbps, 100Mbps to 1Gbps development. All-fiber-optic port device (network fiber optic transceivers) connected by trunk gradually to the desktop development.
FTTH fiber optic cable must be the problem to be solved is the photoelectric conversion problem, that is, the twisted pair of short-distance and long-distance optical signal conversion, ordinary users to use a computer network devices tend not to have the fiber optic interface, not backbone communication network directly via fiber optic communication network port to fiber conversion must be conducted through the photoelectric conversion network equipment with fiber optic interface tunk fiber communication network to communicate only with network interface to fiber the photoelectric converters provide network port,up to provide a fibr interface docking with backbone communications network, down to provide TCP/ IP network interface with computers and other network devices docking, making the computer directly connected to the optical fiber communication by photoelectric conversion.
The industry because way, the reality of broadband access network comprehensive photochemical difficult to implement, such as fiber to the building (FTTB), fiber to the node (FTTN) fiber to the remote (FTTR), fiber to the exchange box (FTTC), collectively referred to as FTTx. Where FTTB suitable for densely populated throughout the multi-dwelling unit buildings such as rental apartments, residential buildings, hotels, etc. will zone, and therefore particularly attracted much attention.