Friday, May 20, 2011
【 Weak current College 】 twisted pair transmitter selection of installation and maintenance guide
Q: twisted pair transmission product variety, how to choose?
A: 1. Distance is 250 meters, environmental interference not big occasions, you can select the passive transceiver;
2. the distance of 800 meters, environmental interference not big occasions, you can select active passive transmitter and receiver
For match.
3. the distance of 800 meters, environmental interference in larger venues, you can select active transmitter and active receive
For match. Transfer effect is good, strong anti-interference ability. And a network cable can guarantee signal transmission
Multi-channel signal.
4. If the transmission distance can not be determined, it is proposed to adopt transmission 1200 meters or 1500 m twisted pair transmission equipment.
Q: in the same root twisted pair transmission multi-channel signal at the same time, some good and some is not working properly, and the device and cable without problems?
A: each way signal must use a pair of stranded with twisted pairs, feel free to use, and receive ends paired to link the mark must be one-to-one, a way of being an end-to-end, the negative side is on the negative side. Q: the video signal directly to the monitor to normal, but received a processor or DVR, signal anomalies, or ghosting or ripple noise?
A: signal during the transfer process has a strong source of interference, you should add Steel Shield; signal transmission distance too far; use a shielded twisted pair, should be replaced by a non-shielded twisted-pair Super five class (because STP will shorten the transmission distance); use the bridged connection methods (twisted-pair video transmission device only supports point-to-point connections, the construction of wiring, don't have the extra thread); the cable quality too badly, it is best to use five or five or more cables; or contact us for replacement of greater distance twisted pair transmission equipment. Q: the video display ripple or sound with noise and sounds, or intermittent, or no signal?
A: check the signal grounding on both ends and should be good, signal lines should be good, input power should be correct; the ends of the connection cable must receive one-to-one, a way of being an end-to-end, the negative side is on the negative side, both ends of the twisted pair transceiver should be good link. Q: image pitting or image, the image object appears clear bright side and white streaks in?
For: twisted pair transmission device dial switch should be set according to the actual distance (distance and receive both to set); the cable quality too badly, you should use five or more than five types of unshielded twisted pair cable (UTP); twisted pair connection is not plugged in. Q: data error rate significantly higher?
A: the baud rate is too high or distance obviously remote or too poor quality using cable, choose a source and belt photoelectricity isolation of data converter or a Repeater or choose code distributor or RS485 splitter. Q: equipment in use, it is easy to be struck by lightning?
A: device internal lightning protection measures have been taken, you should take to protect and preserve the access equipment, grounding resistance to less than 1 ohm; device shell do not and protected land and external metal contact (outdoor use).
No comments:
Post a Comment