nsn-616

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    "Optional" Alarm IO on Hikvision NVRs?

    I have a bunch of Hikvision cameras and want to get a Hikvision NVR. I need Alarm IO, but I don't need POE. I bought this NVR (NSN-616) from Nelly's and the specs are confusing: http://www.nellyssecurity.com/media/specsheets/hikvision/nvr/nsn-616.pdf It says the Alarm IO is optional. The one I...