How to monitor the availability of analog cameras?

Question

Monitoring

Colleagues, good day!
There are geographically distributed offices (about 2500). Each office has 2-3 analog cameras installed (HikVision - 65%, GeoVision - 35%). Cameras write video to DVRs (Geovision GV-VS12 - 12%, Hikvision DS-7204HGHI- 22%, E1, HiWatch DS-H104G - 66%).
There is a need to monitor the operation of the cameras themselves. The question arose as to how to implement this.
If I want to monitor zabbix by pinging the registrars themselves, then I won’t know what to do with analog cameras.
Maybe someone had a similar experience?

Answer 1

Analog registrars, at least those that I met, understood whether there was a signal from the camera or not. We could create an event on this fact and send it by mail or to syslog.
Your registrars don't look old. Look at this moment, it can turn out to be done.

Answer 2

No way. The analogue is not monitored and there is no point in this. It always works ....
You need to monitor recorders and, as an option, you can monitor 12v at the ends, in front of the camera. Like there is food - ok. No - they sent a boy there ... He already has all sorts of mini PCs like arduino ...
Moreover, there are no such problems with hick registrars. They work awesome... I don't know about geovision,

Answer 3

SMTP protocol as an option when the picture disappears, unless of course in younger (your) models this will be:
hikvision.org.ua/ru/articles/nastroyka-email-opove...
Install IVMS-4200 and monitor from there. Geovision has its own utility.
And yes, monitoring 5-7 thousand cameras is crazy.)