Mitel Forums - The Unofficial Source

Mitel Forums => MiVoice Office 250/Mitel 5000 => Topic started by: SXTech on February 07, 2018, 07:08:42 PM

Title: Mitel 5000 LS ports
Post by: SXTech on February 07, 2018, 07:08:42 PM

Have a 5000 6.2 with 20 analog lines, everything is fine except for 1 line that has burned out port 1 of the onboard 
LS ports twice!
Had Frontier check the line for excess voltage and they say the line is within specs.
Have gone through 2 processor modules since I have no other available ports to use. (Customer won't go to T-1)
If a call comes in there is a loud squeal on the line.
Anyone seen this, or know what is going on? ???

Title: Re: Mitel 5000 LS ports
Post by: DND ON on February 07, 2018, 07:55:27 PM

The problem could be excess loop current, not high voltage.

Go to sandman.com and read some excellent tutorials on phone line issues. I recently purchased some loop current regulators from them for a site with similar issues. Since it's an intermittent problem, time will tell if it's solved.

Title: Re: Mitel 5000 LS ports
Post by: acejavelin on February 07, 2018, 10:23:17 PM

Totally agree with DND ON on this, check the loop current... I don't use a voltmeter, just an old 965 if I can find it or a butt-set with a loop current display. You want to see loop current 23-28mA ideally, and it can go up to 35mA without much issue. If I start seeing much more than that, really need to limit the loop current with regulators because telco won't do anything, to them anything over 23mA is fine.

I have seen some rural locations with loop current in excess of 75mA, that will fry a modern key system's CO ports in nothing flat.

http://www.sandman.com/loop.html#LoopCurrentRegulator

Title: Re: Mitel 5000 LS ports
Post by: SXTech on February 08, 2018, 11:37:48 AM

Thanks guys, I believe that is the problem, just frustrated with Telco.
Have to bite the bullet on this one.