Project background:

Fiber To The Desktop (Fiber To The Desktop - FTTD) as The name suggests is that The Fiber can be extended To The user terminal computer by The optical Fiber instead of The traditional 5 copper cables, and The user terminal will be connected through The optical Fiber network. With the development of network technology, optical fiber transmission is one of the important transmission medium of current information transmission. FTTD access technology has been widely used in foreign countries in recent years. With optical fiber and optical fiber access equipment prices continue to fall, FTTD at home are applied to special government departments, such as audit, finance, public security, national security, court, procuratorate, military industry, universities, research institutes, etc.

Procuratorate office computer system consists of two independent subnet: Intranet and Internet, subnet structure completely physical isolation, the Intranet for reconstruction, only new Intranet all fiber to the desktop wiring system.


Programme introduction:

Provide optical fiber to the desktop (FTTD) network in office building

Optical fiber to the desktop (FTTD) network is generally laid in the office building. This paper will take a 4-story office building as an example to illustrate the process of laying the fiber to the desktop (FTTD) network.

The server room is located on the first floor. The other floors are the office area.

The network of optical fiber to the desktop (FTTD) can be divided into three areas for wiring, namely: server room wiring, office area wiring and office desktop wiring.

Server room wiring

Before starting the wiring, it is necessary to determine the type of network equipment such as the switch, the use quantity and type of optical cable and the route plan of the cable according to the actual demand.


Because the fiber optic cable is weak and not easy to manage, the optical fiber to the desktop (FTTD) should be minimized. One of the effective ways to do this is to use BiDi optical modules on switches, so that the number of optical cables is reduced by half. Below are the BiDi optical modules recommended for use in the server room, and the type of optical fiber jumpers and switches that are used with them:


In order to better manage the equipment and cable in the server room, we also need to use rack, adaptor panel, matchbox and so on.

In addition, in the server room it is best to use the open frame, is advantageous for the flexible wiring, cable quantity is small, use adapter panel is sufficient, cable quantity is large, the need to use the compact structure of the box.


Office area wiring

Since the cable must be connected to every desk in every office in the office, it is best to install a hub at every level in order to save fiber optic resources and facilitate the management of optical cables. And if the number of desks is large, it is necessary to install a hub in every office.

Desk wiring

The last step in laying the fiber to the desktop (FTTD) is to connect the cable to the computer, VoIP phone and other terminal devices, and then the wall fiber socket panel is needed. In addition, since most terminal devices have only electrical outlets and no optical ports, we also need to use the optical network terminal (ONT) to convert optical signals into electrical signals. The specific practice is to connect the optical network terminal (ONT) and the wall fiber socket panel with the optical fiber jumper wire, then connect the optical network terminal (ONT) and the terminal equipment with the network jumper wire.


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