HDMI
Speaking of cables, did you know phono quitar cables actually originate from the telecom industry? That's why they're called PHONE-o cables. Operators used those cables to connect calls. In phone terminology we still talk of "tip" and "ring". Tip is ground (sorta) and ring is -48v (-54v float). When doing a line test to determine if there is an issue with a phone line it will show resistance and capacitence between tip to ground, ring to ground and tip to ring. People who really know their stuff can tell what type of trouble may exist on the line based on different conditions. Very low capacitance and no short can mean open at the CO, for example.
Those actual cables arn't use that much for regular phone circuits but are used for data circuits at panels called a DSX panel (not to be confused with door security access panels which are also called that). Typically they're just used during testing phase though, 4-wire connections will be run, similar to what is done at the MDF with 2 wire connections.
This is your TIL for today.
Alot of our 4 wire ds0 circuits still have loopback cards that have the 310 test jacks. It's getting harder and harder finding any techs that can work them.
Alot of our 4 wire ds0 circuits still have loopback cards that have the 310 test jacks. It's getting harder and harder finding any techs that can work them.
I just realized I've seen a setup similar to this at an older facility in Fremont or Milpitas. I also heard some amazing stories about how old engineers sent various analog signals down a single wire; that to me is still magicwtf.
Yeah loopback testing. I think they send 1004hz or so and a tech at the other end will put a loop back, if the tone comes back, then it means everything is good up to that point. Good to prove out troubles and what not.
Lot of the newer stuff can do it automatically though, so you can actually remote in and setup loop back tests and what not. I logged into a system like that, think it was a Pairgain.
Oh like DE-4 channel banks and stuff? We have some of those too, though, not that much. Been in a CO at another telco and they had rows and rows of DE4's. you could plug right into them. Never played with that stuff much myself though.
Yeah loopback testing. I think they send 1004hz or so and a tech at the other end will put a loop back, if the tone comes back, then it means everything is good up to that point. Good to prove out troubles and what not.
Lot of the newer stuff can do it automatically though, so you can actually remote in and setup loop back tests and what not. I logged into a system like that, think it was a Pairgain.
1/4 in "phono" cables probably originated with phonographs, in the world of audio.
trs is very common audio terminoligy as well. and the same cables and style of patch panels is used for patching microphone jacks from one place to another in a theatre.
anyway... i like http://www.bing.com/images/search?q=amphenol+connectors+military&qs=ds&form=QBIR
we use them for most things. military connectors. hella expensive though.
I remember those military connectors. They were great until you had a pushed or bent pin on a 50+ pin connector then that was a pita to fix.
Lightning. No question.
Reversible. Quick, secure connection. Quick disconnect.
I also heard some amazing stories about how old engineers sent various analog signals down a single wire; that to me is still magicwtf.
I wonder if BNC could replace the F connector. The F means fuck it after all! LMAO! But BNC might not be too good for high frequencies that are in use now in cable TV.