In today's world, most weak current systems rely on the TCP/IP transmission method. As a professional in this field, it is essential for us to have a basic understanding of network knowledge. The following information will definitely be helpful for your work.
**1. Q: How to handle long-distance network cable construction in an office building where the internet access point is located far from the center?**
A: According to international standards, balanced twisted pair cables support data applications up to 100 meters. However, beyond that distance, performance depends on the cabling system, network equipment, and site conditions. To ensure stability, it’s recommended to set up two telecom rooms on one floor, with horizontal links not exceeding 90 meters. Alternatively, high-quality cables can be used for direct connections over 100 meters, but they may not support higher speeds. Adding a relay or switch in the middle is also a safe option to avoid signal loss.
**2. Q: A network port is separated from the floor switch, and although the computer and line are fine, it only sends data. What could be the issue?**
A: It might be a wiring problem. Test the entire channel using a wiring tester, including jumpers and connectors. Ensure the cable type (Cat5e or Cat6) matches the required performance. Also, check if the wiring follows T568A/B standards.
**3. Q: What are the special requirements for Fiber Channel wiring in a data center?**
A: For 10G networks, use OM3 multimode fiber (300–550m) or single-mode fiber (10–40km). Choose appropriate connectors like SC or LC. If using open trays, ensure the cable meets fire rating Class A or B. Place optical distribution modules in accessible locations such as cabinets or walls.
**4. Q: How to efficiently layout cables in a three-floor building with 80–100 computers per floor?**
A: Use a Layer 3 switch at each floor, connected through a central server for sharing and internet access. Add an aggregation switch for better performance. Ensure horizontal cables do not exceed 90 meters and use Cat5e or Cat6 cabling. Design a detailed layout plan for clarity.
**5. Q: What should be considered when accepting network cabling?**
A: Follow GB50312-2007 guidelines. Test all information points, ensure the test instruments meet the standard, and verify the results. Check the quality criteria and document everything for future reference.
**6. Q: Can cables wired according to T568A/B support Gigabit Ethernet?**
A: Yes, as long as the cabling system complies with Cat5e or higher. Gigabit uses all four pairs, and POE can be implemented without issues. There are two modes of POE: end-span and mid-span, both compatible with Gigabit.
**7. Q: Will CATV replace ADSL in the future?**
A: Both technologies have their own advantages. CATV supports multiple services via HFC, while ADSL is widely used for broadband. They coexist based on regional policies and technical needs.
**8. Q: What is "short link resonance"?**
A: This occurs when a short link (less than 15 meters) causes signal reflection and interference. Standards require a minimum of 15 meters to avoid this. Some vendors have optimized products to reduce the impact.
**9. Q: How to access the Internet and connect different networks?**
A: Options include fiber, ADSL, EPON, and wireless. For private lines, SDH/MSTP leased lines can connect different sites. Consult with the service provider for specific configurations.
**10. Q: After passing tests, why does a PC disconnect from the network later?**
A: Use professional testing tools instead of simple ones. Check insertion loss, crosstalk, and return loss to identify potential issues.
**11. Q: How to manage dynamic office layouts and messy cables?**
A: Implement an open office design with CPs or multi-user sockets. Follow GB50311-2007 for structured cabling and ensure flexibility for future changes.
**12. Q: How to plan for future expansion and protect cables from pests?**
A: Choose forward-looking products and structured designs. Use armored or anti-rat cables, and consider open wiring to deter animals.
**13. Q: Why is LAN speed slow when using two cores for voice and data?**
A: Mixing voice and data on the same cable can cause crosstalk. This is non-standard and should be avoided.
**14. Q: Should VLANs be created on each floor or centralized?**
A: VLANs on each floor offer better control but increase cost. Centralized VLANs can also prevent broadcast storms.
**15. Q: Is it safe to stack power and data cables together?**
A: No, stacking can cause interference and damage. Keep them separate and organized for safety and efficiency.
**16. Q: What tools are needed for testing Super Category 5 cables?**
A: Use certified testers like Fluke DTX series. These tools provide detailed reports and ensure compliance with standards.
**17. Q: Is Simon's network cable suitable for large LANs?**
A: Yes, as long as it meets the required performance standards. Verify product specifications and choose reliable brands.
**18. Q: What are the labeling standards for cable equipment rooms?**
A: Follow GB50311 and GB50312. Labels should be clear, durable, and consistent. Refer to TIA/EIA-606 for guidance.
**19. Q: Why does wireless signal not reach the second floor in a metal-walled room?**
A: Metal walls block signals. Consider using signal extenders or adjusting router placement for better coverage.
**20. Q: What precautions should be taken when laying fiber in a machine room?**
A: Avoid harsh environments, use proper conduits, and ensure protection against dust and moisture. Differentiate between single-mode and multi-mode fibers based on application needs.
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