Network Engineering Knowledge

First, network engineering is not as simple as "pulling a few network cables"

Many enterprises think that network engineering is "wiring + installation routing", the result is frequent drop after check-in, slow network speed, CCTV video stutter, rework cost far more than the original specification input. A qualified enterprise network, from survey, topology design, wiring specification to optimization acceptance, is a system engineering.The more detailed the early planning is, the more worry about the later operation and maintenance.This is a truth repeatedly verified by 15 years of engineering practice.

II. Structured Cabling: Concealed projects are most likely to be cut corners

Cable buried in the wall, bridge, is a typical "hidden project", but also the most prone to problems, the most difficult to rework links. When wiring, be sure to pay close attention to these points:

• With the wire:At least five kinds of super Gigabit scenarios, recommended six kinds of lines. Poor copper clad aluminum short-term can pass, long-term inevitable packet loss, speed limit.
• Strong ELV separation:Network cable and power line, power cable tray to maintain a distance, to avoid electromagnetic interference caused by packet loss and CCTV image noise.
• Standard routing and labeling:Horizontal and vertical, tied neatly, and labeled at both ends. This step may seem laborious, but it is the lifeblood of future troubleshooting efficiency.
• Point by point test:Each information point should be tested and certified with professional instruments such as Fluke, rather than "being able to access the Internet."

III. Wireless coverage: full signal does not mean good experience

"Everywhere is full" is just a facade, the real wireless experience depends on concurrency, roaming and interference:

• AP is not the more the better:Point density will cause co-frequency interference instead, so channel and power planning should be done.
• AC+AP is the enterprise solution:The home routing stack cannot be managed uniformly. In enterprise scenarios, an AC controller + AP architecture should be implemented to achieve seamless roaming.
• Site thermal map survey:If it is not accurate to estimate the points based on experience, it is necessary to measure the thermal distribution of the signal with professional tools and then determine the number of AP.
• Measured roaming and concurrency:When accepting, hold the laptop while walking and test, simulate the peak concurrent, and ensure that the mobile office does not drop the line.

IV. Monitoring and network convergence: one network to do many things

Today's enterprise projects tend to be more and more "a fiber optic network carrying office data + CCTV + IPTV", multiple coverage of a construction, both saving money and easy to unify management. When planning, the ELV system such as network, monitoring, access control, etc. is designed as a whole to avoid repeated excavation and repeated wiring, and the overall cost can be reduced by about 30%.

extended reading

• The core nodes of an enterprise network are servers and server rooms.Server RepairsumIDC HostedServices.
• Hardware failure of network terminal equipment (computer/laptop) will also be manifested as "network problem", if necessary,PC RepairScreening.