The four characteristics of coaxial cable transmission need to be
the characteristics of coaxial cable transmission requires:
first, wiring simple. In actual application of the system can realize 40 monitoring signals through a coaxial cable of the two-way transmission. In data transmission, including video information already, also including audio information and control signal.
second, large frequency bandwidth. Unlike network monitoring, coaxial cable is 0 ~ 1000 MHZ frequency bandwidth, the large bandwidth monitoring data using only the part of the bandwidth resources, also left alarm information such as the transmission space.
the third: two-way transfer: use 5 ~ 65 MHZ to downward transmission of front-end yuntai and lens data control signal, the use of 110 ~ 550 MHZ to uplink transmission monitoring audio and video signals, and 65 ~ 87 MHZ for two-way transmission of signal isolation belt, has the signal in the transmission side of the road will not conflict.
4: anti-interference: the audio and control design on the high frequency signal, only when the transmission attenuation carrier signal, video signal without attenuation.
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