With the promulgation and implementation of the national “Code for Design of Fiber-to-the-home Communication Facilities in Residential Areas and Residential Buildings”, both newly built and renovated residential areas require FTTH access methods, and must meet the requirements of equal access for multiple telecom service operators , there will be a very large demand in the market for optical fiber distribution equipment that can simultaneously satisfy the access of three operators and realize fiber-to-the-home .
co-construction shared optical fiber distribution box is designed and developed for this demand. It can meet the common access of three operators and ensure their independence from each other. It can realize the introduction and fixing of optical cables and the protection of stripping, the fusion and protection of optical fibers The distribution and scheduling of signals can also meet the installation of optical splitters to realize the optical splitting function of signals.
Compared with ordinary optical fiber distribution boxes , the design difficulties and key points of co-construction shared optical fiber distribution boxes are in the realization of “the three operators are independent of each other and must be completed together with the builder when opening services”. The most direct idea is that the three operators The operator and the builder use a box respectively, and the box between the operator and the builder is connected to open the service through a jumper wire, but there are the following problems in doing so:
Four cabinets are required, which is costly;
The cabinets should be connected by jumpers, which is insufficient in aesthetics and safety;
(3) The installation and placement between the boxes need to be optimized.
Therefore, we consider combining four boxes into one, and design that one box is divided into four cabins, and the four cabins are respectively equipped with door panels, and different door locks are used. The doors cannot be opened mutually to ensure the independence of each cabin. The cabins are separated by partitions, and holes are reserved on the partitions between the operator and the builder for mutual jumpers. The left side of the box is the builder’s cabin, and the right side is divided into mobile cabins from top to bottom. , China Unicom, and China Telecom three operator cabins, the functional design of each cabin is as follows:
Construction business cabin: It meets the needs of introduction, fixation and storage of home-entry butterfly cables, welding of butterfly cables and pre-installed pigtails, signal distribution and scheduling.
Carrier cabin: meet the requirements of the introduction, fixing and stripping protection of the respective outdoor optical cables, the fusion splicing of the outdoor optical cables and the pre-installed pigtails, the installation and fixing of the optical splitter, and the termination of the optical split input.
Since the operator’s cabin consists of three cabins from top to bottom, if the operator’s cabin needs to meet the requirements of the introduction, fixation and stripping protection of outdoor optical cables, height and protective devices must be designed in the three cabins. This design has the following aspects disadvantages:
The three cabins are arranged from top to bottom, and the outdoor optical cables must be connected from the side, which is not aesthetically pleasing
Three sets of high-voltage protection devices are required, which increases production costs;
(3) When the three sets of high-voltage protective devices are grounded, they need to be connected in series, which increases the difficulty of construction.
If the outdoor optical cable introduction, fixing and stripping protection functions are realized in the builder’s cabin, only one set of common high-voltage protection device is needed, which can avoid the above shortcomings. Introduced into each operator’s cabin and welded with pigtails to achieve other functions.
Through the above analysis, combined with user configuration requirements and usage habits, the overall plan for co-constructing a shared fiber optic cable distribution box is determined as follows: the box body is divided into compartments, each compartment is designed with a separate door panel, and each door panel is equipped with a different door lock, and the door locks cannot be opened. , to ensure the independence of each cabin, the outdoor optical cable is introduced, fixed, and stripped in the builder’s cabin, and then introduced to each operator’s cabin, where it is fused with pigtails in the operator’s cabin, and connected to the optical input through an adapter. The sub-output pigtails are led to the right side of the adapter in the building business cabin. After being fixed in the building business cabin, the castellated optical cables are led to the fusion splice tray to be welded with the pigtails. The pigtails are led to the left side of the adapter mounting plate and connected to the optical distribution pigtail The docking realizes the distribution and scheduling of optical signals.
The design of the co-construction and sharing optical fiber distribution box solves the disadvantages of repeated construction and waste of resources in the corridors of various operators, and greatly saves the investment and construction cost of FTTH. Its co-construction and sharing series products such as co-construction and sharing optical cable handover Products such as boxes, co-construction and shared optical fiber distribution frames will also gradually receive attention and be used on a large scale.