... the latest optic communication technology, provides 1-64CH video, 1-32CH bi-dir audio, 1-32CH ... widely used in CCTV, video surveillance, national defense, and etc.For 1-16 channel video devices, we provide two ... the other is chassis. For 17-64 channel video devices, there is only chassis provided. Front ... Chassis: 220VAC/-48VDC double hot backup powers 2. Video Channel: 1~64 Format: PAL/NTSC/SECAM Signal ...