I/O Connector Cabling? Standard?

I managed to jam a cable in the "I/O" connector on an Axis P3364. Try looking that up on Google. Are these "standard" connectors, and what do you call them? And how do you release a conductor if it's the type of terminal block with a plastic tab in the middle that appears to be meant to release the metal jaws inside that really do hold onto a wire quite well... Are they all the same? Which IPVM.COM tutorial should I have checked out to learn how to attach i/o cables to a camera?

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