Knowledge

Write down the most frequent on-site questions in the consultation as quick questions and answers. Each question only asks which item to check first: speed file and port, single fiber pairing, which range the light collection falls in, and whether the bandwidth level is sufficient.

Divide the specifications in use into three categories: standing, quarterly replenishment, and temporary replenishment according to frequency of occurrence and delivery time. Provide a basis for judgment and a stocking list that can be rearranged every year to prevent the more models from becoming unsafe.

Compile the common specifications of optical modules, transceivers and high-speed cables in the station into a quick checklist. First, build a map of speed, distance, and ports in three directions, and then narrow it down to specific models according to link conditions.

Whether the same section of interconnection uses DAC, AOC, or optical modules and jumpers, the difference is not only in price. This article gives alternative conclusions by distance, and lists three categories of situations where cables cannot be used on top.

The boundaries between distance files and wavelengths that can be used are not the same. This article lists the conclusions that can be determined according to the distance range within the station: low-end cannot withstand high-loss links, and high-end can prevent light receiving overload for short distances.

Use a comparison table to clarify the interchange boundaries of Gigabit, 2.5G and 10G optical modules: whether the port speed can be reduced, whether the module can be speeded up, and how to align the network card gears. Before replacing, please check the three boxes.

Focusing on the co-cable transmission of video, vehicle inspection and jet fan control signals in the tunnel, the on-site practices of business grouping, fiber core distribution and optical terminal cascade levels are reviewed, and the basis for judgment when the level is too deep is given.

Taking the 220kV substation dispatch traffic transformation as an example, this paper illustrates the priority of traffic channels in optical isolation transformation, the three items to be checked for telephone and data common fiber multiplexing, and the impact of terminal naming on line checking efficiency.

Classify communication repair reports between substations and stations during thunderstorms according to phenomena, sort out the three types of inducements, induced overvoltage intrusion, lack of protection in the lower conductor section and improper grounding practices, and provide criteria and rectification sequences respectively.

Combined with the damage record of the serial communication port in the outdoor area of ​​the 220kV substation, the mechanism of ground potential difference forming circulating current in the copper cable loop is explained, and why optical isolation preferentially covers channels that span different grounding networks.