Knowledge

The transformation of the all-optical network in the teaching building is often stuck in the uplink: teachers' 4K screen projection, student tablet polling, and video class return transmission are all consuming bandwidth. This article provides a three-step calculation method from the classroom endpoint to the PON port capacity, with suggestions for GPON and XG-PON selection.

To perform FTTR in the dormitory to the room, the location of the light splitting point, jumper protection and bandwidth allocation must be planned in advance. This article provides self-examination points one by one, with calculation reference for per capita bandwidth and number of rooms with PON ports, to help reduce rework in renovation projects.

Why does one POL fiber transmit and receive without interference? The answer is written in the wavelength: downlink 1490nm, uplink 1310nm, 1550nm left for video overlay. This article explains the origin of the division of labor, the magnitude of filter insertion loss, and the verification method when changing modules or terminals.

POL passive optical LAN divides the network into three layers: computer room OLT, passive optical splitting network, and room ONU. This article explains the responsibilities of each layer and common loss levels. For example, 1:32 light splitting is about 17dB, and it is recommended to leave a 3dB margin. It helps park managers understand how to build a fiber-to-room network.

In a site with scattered points, most of the time for a failure is spent on the way to and from the site. This article provides maintainable link design practices from three aspects: access model convergence, link status concentration, and on-board spare parts strategy.

The most likely problem at the moment of switch operation is the electrical link. This article determines which signals should be polished first according to fault signs, and gives the implementation sequence of hierarchical cutover and baseline recording.

The end points of the field sites are scattered and there are many cross-paths. It is not always cost-effective whether all fiber optics are used. This article delineates the division of labor between wireless and optical fiber according to service types, and gives three implementation constraints for hybrid networking.

Most communication interruptions during thunderstorm season are not caused by fiber core breakage, but by the intrusion of lightning current along metal components and the power supply side. This article gives specific methods for the lower lead section, cabinet end and recovery after rain.

The power collection circuit points are scattered and the signal speed is low, so the risk of directly installing copper cables is high. This article explains how the fault indicator and switch remote signaling are transferred to the 485 through the collector, and then the wiring and troubleshooting procedures for glazing.

Station-side communication equipment is installed in box-type transformers or outdoor cabinets. It is cold in winter and hot in summer, and the temperature difference between day and night is large. This article gives a three-step method of first measuring the extreme temperature inside the cabinet, then controlling condensation, and finally setting the model number.