Video SYNC signal or V Phase, not balanced, would cause picture up-rolling this would occur when there is a weak, strong differential video signal into DVR. Also if the video signal is under a long range cabling may cause Impedance not Matching . For Twisted Pair cabling, use the TVB-001 ( Twisted Pair BALUN) for extra interference isolation, Coax cabling, use the CB-001VH.
Cable : Twisted Pair
Dimensions mm: 35x25x20 with 12cmx2 cable
Material: ABS Black
Eliminate interference under long range cabling caused by Impedance not Matching , add TVB-001 BALUN at connecting point between two-wire connections for compensation.