problem in connecting a NVR to LAN

[garrymeax]

i am trying to connect my NVR to my LAN.

here is my current layout.

i have a router(IP 192.168.18.1) and a NVR (IP 192.168.18.2) and 3 switches(S1, S2, S3).

S1 is connected to router via a patch code.
S2 and S3 are connected to S1 via patch code.
NVR is connected to S2.

problem is some cameras are working.

as soon as i connect these NVR to LAN i am loosing all the cameras. i took below pictures after removing NVR from LAN. even after disconnecting
from some cameras are not showing.

 

[Jagradang]

Are any of your switches managed? Which switches are they?

Sent from my SM-G935F using Tapatalk

 

[alastairstevenson]

How many video streams do the (unspecified) cameras support?

 

[garrymeax]

after restore default settings for channels now all cameras are ok.