A telephone line is the incoming line of a telephone, which is connected to the telephone in order to make a call. Common materials (conductors) include: 1. Copper clad steel wire is relatively hard and not suitable for external pulling, which can easily break the core. But it can still be used if buried in the wall. And it can only be used for close range use, such as from corridor junction boxes to users. 2. Copper clad aluminum wires are relatively soft and prone to core breakage. It can be buried inside the wall or pulled outside the wall. And can only be used for close range use (such as corridor junction boxes to users) 3. All copper. This type of wire is soft and can be buried inside the wall or pulled outside the wall. It can be used for long-distance transmission. Among them, the only ones that meet national standards are telephone lines made of all copper
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China