Knowledge

Debates over renovation plans often end in failure to settle accounts. This article puts the four costs of equipment procurement, downtime losses, manpower training, and dismantling on a table, and then gives a choice method based on the three stages of core, aggregation, and access.

The most expensive part of a renovation is often not the equipment, but the rewiring. This article gives a method for judging whether to retain old network cables, old optical cables and pipeline power supplies: based on actual measured speed and attenuation assessment, those that can be reused should be archived first and then renewed.

If the bandwidth is insufficient or the equipment is old, don't rush to replace the whole machine yet. This article breaks down the applicable boundaries of component-level replacement at the four levels of cable, module, network card, and complete machine, and provides three checklists and fallback methods before starting.

The number of models in the spare parts cabinet is piling up, and the sluggishness and management costs are rising together. This article gives a three-step method for simplifying spare parts: first, compile a model convergence table, then unify the interface and power supply standards, and finally use cross-brand coding to achieve universal use of the same specifications.

When the fiber core is not enough, the cost structure of wavelength division common fiber and new optical cable are different. This article breaks down the division of labor between single fiber bidirectional, coarse wavelength division and dense wavelength division, and gives three situations that are more suitable for direct cable laying.

It is a common problem to find that the spare core is not connected and the free port has no label when expanding the capacity. This article provides reservation design and account management practices based on the three layers of fiber core, port, and slot, making capacity expansion a matter of plugging in jumpers.

Upgrading the original cable from Gigabit to 10G requires three accounts: whether the receiving end margin covers the new rate, long-distance dispersion margin, and whether the port and supporting facilities support it. This article provides accounting methods and common pitfalls item by item.

Optical link margins that have been in operation for many years will decline due to changes in joints and construction. This article provides a recalculation method for baseline comparison and change accounting, along with three disposal options after the margin falls below 3 dB.

When the budget is fixed, the capacity expansion action is to first change the dual-fiber to single-fiber core, then calculate the margin step by step to increase the speed, and finally consider adding wavelengths or laying cables. This article gives the prerequisites, judgment conditions and common points for each issue.

Capacity expansion does not necessarily require laying new optical cables. It is necessary to first conduct a three-step inventory of the existing fiber core, check the end, and check the optical fiber. This article gives the key points and judgment criteria for each step to turn the spare core into a capacity that can be used directly.