sundance-communications.com/forum Forums General General Telephone & Systems Information loop current

Does any one know where I can get the ANSI standard for loop current? A search on the Internet only bring up IEEE std 820 1984, which has a confusing graph on it. I'm arguing with the phone company and I know they will not interpret the graph the same as me. I need something that spells it out for them. FYI my interpretation is 20-40ma, if it isn't official I'll get nowhere with them.
Thanks,
Bill

Try this link to see if it is any clearer.

<LINK> https://www.control.com/1026196281/index_html </LINK>

Not really, but thanks. I can get them to agree that anything below 23ma is too low, it's the high end I having trouble convincing them on. I know some electronic key systems and PBX's can't handle high loop current, so I either convince them they have a problem or put current regulators on the ones with problems. Just don't think the customers should have to pay for something the telco should fix. But as I stated if it ain't official they won't buy it. The bad part is their test set just says pass or fail and is preprogrammed at fail below 20 and fail above 110 which is way too high. Everything inbetween is pass.
Bill

I don't know what you have looked at on the net, but here was a relatively lucid explanation. <LINK> https://www.sandman.com/loopcur.html </LINK>

You're right about the limited amount of subject material. The only ANSI specs I have seen are these, ANSI/ISA S50.1-1972. This is a data current loop, and probably not what you are looking for. Good luck.

Yes, I gave them Sandman's paper, but of course that isn't offical.
Bill

I always test loop current by crossconnecting to a standard issue pots line, putting the unterminated end in my mouth, and wait for someone to dial in. If I shout F@!# really loud and the customer comes running in checking on the situation, then i know there is plenty of loop current.

~nails

That would be 20 hertz ringing current and there's a reason they call it hertz. Hope someone can help on this, cause I know the loop current is way too hot.
Bill

Any other ideas on this one??
Bill

Bill, you and I both know that is is to hot but the LEC are using standards written up back in the 70's. Have you given any thought to try and bring it down yourself. Sandman has some devices on his website, even one that is supposed to leve the lin at 25ma no matter what or there is the old 100 Ohm resister bridging tip and another bridging ring that can sometimes help. I know it would be much better to get the guilty party to fix it but sometimes it is a losing battle.

Kerry

[This message has been edited by Bigkayeh (edited June 30, 2004).]

Yes I have considered the current regulators, and will probably have to go that route. I'd just like to find the latest ANSI standard as I'm sure it hasn't changed, 20-40 ma. What has me ticked is one week the current is good as it has been since I started doing this here, 27ma and now it's 60ma. But since their test sets only have a pass fail, they have no idea what the actual reading is or was, they would have to push another button to see that. I haven't seen a 60 mill loop since my old 28 teletype days. So if anyone knows where I can get the current ANSI standard, I'd appreciate it.
Bill