Recently I had the opportunity to visit a telecom/data room that was being decommissioned. A lot of the remaining equipment seemed to be from around year 2000 or so, as best as I could tell.
While there I spotted a bundle of wires with connectors that were new to me. Most of them looked like this:
These pics show a 2, 4 and 6-wire types; 2-wire was the most common.
Both ends of the cables had this type of connector.
Unfortunately they were all unattached and I did not see anything that looked like they would plug into.
So far I've not been able to turn these up in any web searches. What are they and what are they used for? Were or are they especially common?