28-layer Multilayer PCB board, Base Material: FR4 TG 180. inner/outer copper thickness 1 oz. Immersion Gold surface treatment with green color soldermask. White color Legend.board thickness 3.6 mm. Min.line width/Min.line spacing 0.18/0.18 mm. E-test: 100%
Most of multilayer PCB boards are designed with impedance. There are two impedance tester in our factory.General single end impedance at 50 ohm, differential 100 ohm. Tolerance 10%.
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According to the person in charge of the Advertising Law Enforcement Division of the Xixiangtang District Administration for Industry and Commerce, in recent years, more and more unit businesses in Nanning have installed LED screens outside the stores to distribute various products or promotional advertisements. However, many advertising agencies have not realized that LED electronic display screens are also outdoor advertisements. According to relevant regulations, they need to apply for the “Outdoor Advertising Setup Permit†to the urban management department, and then go to the industrial and commercial department to review and register the advertisements. The outdoor advertising registration number can only be released. In the case file of the law enforcement unit, half of the LED advertisements were released without authorization. “Even some formal financial institutions such as banks, financial products advertisements published on LED electronic displays have not been reviewed by relevant departments, and they have not been obtained. Advertising registration certificate." At present, the detachment has issued 20 “reform notices†for such cases, and has also imposed penalties on 10 more serious outdoor advertising units.
Law enforcement officials said that LED electronic display advertisements have the characteristics of fast content update, and once the content changes, they must go to the industrial and commercial department for review. At present, the advertising unit can go to the Urban and Commercial Bureau for content review, and within 7 working days, there will be an audit result, and the content review does not require payment. Advertisements set up in underground railway facilities, urban rail transit facilities, underground passages, and inside and outside stations, terminals, and airport terminals are also in the category of outdoor advertising, and the content to be published also needs to be reviewed and registered. 
The relevant person in charge of the trademark advertisement management department of the Nanning Industrial and Commercial Bureau of Guangxi said that Nanning will further regulate and manage the LED electronic display. The industry and commerce department reminded that the content of LED advertisements also needs to be reviewed and registered, and will be subject to punishment if released without authorization.