Puzzled: VTH can't connect to VTO directly, but works via switch

ayushin

n3wb
Joined
Jul 5, 2022
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Prague
Hi,

I am really breaking my head what could be the problem here?

This used to work:

VTH1510 -> 2 pair ethernet -> inline-coupler -> 3 pair ethernet cable to downstairs -> some multiport generic switch -> VTO1210C-X

For some reason today ip works, DHCP works, but when I try to connect to the VTO I get a black screen for about 20 seconds and a message device offline.

When I replace the inline coupler with a passive ethernet switch (nothing else connected just these two cables) everything works again.

I replace the switch with the coupler, all works (incoming calls and even door open button) but video does not.

I have tried changing couplers and well, this used to work, I have no idea what could have gone wrong, not even what else to try?

Ideas?

Alex
 
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