【 Weak current College 】 twisted user FAQ answer

Q:. twisted pair transmitter of cable?
A: Please use five or more than five types of unshielded twisted pair (UTP 24AWG conventional copper CAT5 wire diameter is 0.5mm), higher transmission cables categories, the better the effect. 5 shielded twisted pair (STP CAT5 24AWG) can in some strong electromagnetic interference, and other special circumstances, but will shorten the transmission distance. Three or four types of unshielded twisted pair you can also use, but the image effects, transmission distance and anti-interference performance a lot. Parallel not stranded together (for example, the parallel lines) of cable and two separate shielded cable, not recommended. According to the different use of the environment, use a different cable, such as indoor cable, outdoor cable, water-line cable, etc. Q: When can the cabling and the other cable twisted pair together (for example together)?
A: in the construction of wiring, and ordinary phone line, computer, network cable, coaxial cable, optical fiber transmission together; but try to avoid transmission with power cord, as in a pipeline transport, keep the distance between each other more in 50cm, particularly high voltage and high power cord. Q: can I use an existing computer network cable to transmit video, audio, data signal?
Answer: as long as there is no use to use a twisted pair cable can be used to transmit video, audio, data, and general computer use network line two twisted pair to transport Ethernet and other signals, two on line you can transmit video, audio, and data. But the signal cannot be transmitted through the HUB, switches and other devices. Q: twisted-pair connector service how to connect?
A: a normal network cable box is 305 m (1000ft), in each case are connected between the Ethernet cable, do not directly screwed together, if the connection is not good, contact resistance is too large, and even influence the transfer effect can't be transferred. Links, according to the color, use a soldering iron welding a one-to-one correspondence to the outside with insulation tape wrapped to prevent short circuit, such as outdoor connections, to do a water repellent treatment. We recommend that users custom cable, you can make different choices in different lengths. Q: how to simulate a real use environment to test twisted pair transmission devices?
A: you can use a box line to simulate real-world environments. A box line typically 300 meters, you can individually into 300 m, 600 m, 900 m, 1200 meters (a total of 4 on line, up to 1200 meters, if a long two-box line). Should make the signal in a thread in transit is in the same direction. Q: a twisted-pair can pass which combinations of signals?
Answer: a non-shielded cat 5 or cat 5 twisted-pair usually have more than four twisted pairs, 4-channel video can be transmitted; in short 1-on-line can transmit all signals, 4-pair cable can transmit 4-channel signal (for example, you can transfer 4-channel video or 4 channel audio or 4-channel data or the three signals of any combination), another large logarithms twisted pair can transmit more signal. Q: twisted pair can download power?
A: you can transmit low-voltage power supply 12VDC, 24VAC, etc. But you must ensure that the power passes in compliance with the requirements of the device. If the equipment is working power, the current 10-12VDC 50MA internal resistance of the twisted pair is 10 Ω/100 m (actual measurement), if the transfer of power supply 12VDC, to ensure that equipment is used properly, you have to transfer power from 200 meters. But we do not recommend that users use twisted pair transmission power. Q. 6 unshielded twisted pair can use?
A: you can. As long as they are 5 or UTP category 5 or above, can be used. Q: can I use non-twisted pair (like Parallels)?
A: we have a few users using non-twisted pair, but transmission distances are short. Therefore, we recommend that users do not use non-twisted pair, so as not to affect the transmission distance and image effects. Q: twisted-pair video transmission devices support center-tapped for bridging connection?
Answer: the twisted-pair video transmission equipment suitable for point-to-point direct connection, do not use the taps from twisted pair intermediate bridge connection. If you remove the user from the twisted-pair cable to a pair of Midway, you must set the on line behind redundant cable disconnected.