Knowledge

The test of optical communication equipment during sea transportation and long-distance air transportation is in the box: moisture, stacking pressure and vibration. This article gives the layering methods of anti-static, moisture-proof and shock-proof according to the inner layer, middle layer and outer layer, and explains the impact of marking and pallet writing on unloading efficiency.

Equipment labels for overseas markets do not require a literal translation of Chinese. This article provides a list of fields that must be retained on the shell label, a stable way of writing common terms in optical communications, and compliance requirements for label materials and affixing locations.

Environmentally friendly material declaration is often misunderstood as a certificate. This article explains the general limit apertures of the ten restricted substances, the calculation method for homogeneous materials, and which materials in optical modules, cables and jumpers really need attention.

Whether the optical module needs to be CE-labeled depends on which directive the product falls into, rather than a verbal requirement from the buyer. This article sorts out the judgment sequence according to three common directives: EMC, low voltage and RoHS, and explains the differences in labeling obligations for complete machines, modules and passive equipment.

It is not complicated to split the batch delivery into several batches. What is difficult is to align with the construction conditions, acceptance time and reissue window. This article provides methods for arranging batches, accounting handover actions for each batch, and reserving reissue.

Selecting a module level based on the actual measured distance does not mean it is just enough: This article explains the judgment sequence of distance binning, the recommended loss margin, and the method of using an attenuator to press back the receiving range when the long-distance module is overloaded on the short link.

The three things that are most likely to cause disputes in bulk purchases are: when does the warranty start, what damages are not covered, and how faulty parts are transferred. This article gives the caliber that can be written into the document and the specific methods for batch traceability.

The method for estimating the number of spare parts for an operator's project: based on the installed capacity and fault records, weighting according to the importance of the site, and then using the replenishment turnover cycle to determine the inventory level to avoid one-time supply failure or repeated shortages.

When delivering batches to dozens of offices, the label field determines whether the installation will be incorrect. This article gives the minimum field set, wavelength and distance file labeling methods, as well as common misunderstandings about labeling positions and blocking optical ports.

After the batch arrives, how to use the manufacturer's piece-by-piece test report to complete the acceptance: first align the batch and serial numbers, then determine the four types of data such as transmit power, receiving sensitivity, operating temperature and DDM, and finally determine the sampling ratio and sample retention method.