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Comment by Havoc | Hacker News Reader

Somewhat OT but perhaps someone knows. I noted the cameras in UK airports have dual eth cables going in. Anybody know what's up with that?

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This is to separate the signaling traffic and the video streams traffic, so that the videostreams don’t oversaturate the control network.

Here’s some details:

https://www.securitycameraking.com/securityinfo/setting-up-y...

I'd assume they were bridged, so you could either daisy-chain the cameras, or use it in-between the uplink and an AP. So you could it whereever you already have an AP without pulling new cables.

No, I don’t think so. Daisy chaining in networking is the worst possible design. For instance, the AP you’ve mentioned would go offline if the camera breaks. Not to mention stp diameter issues that are also possible in such designs. Normally each traffic consumer should be connected to an access switch using a separate port.

If I was designing a security camera I'd have a way to connect two completely different networks to it so all my cameras don't go out in case one of the networks goes down. I do the same with my servers (+ a separate management network).

That seems plausible. Thanks

They do this with public audio systems for similar reasons.

If that was the case, two different connection methods would make sense, not using Ethernet x2 which is what's happening here. Being able to daisy-chain cameras seems more likely.

Don't think so. Having two different networks in a building is pretty common, but I haven't seen any in-building net not using Ethernet in the past 20 years. Fiber is still being terminated and turned to Ethernet usually.

Not saying it wouldn't be better - but I don't think that's what people would usually do.

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