extension voltage problem

[natemgt]

My customer has a SX200ICP system. I am getting anywhere from 22-24vdc on my analog extensions. It is coming off ONS cards and even my ASU. Random ports on different bays will jump up to 90vdc-150vdc and back down, it happens almost like clock work and then it will stop.

I checked technical specs for ONS class line cards should be 48vdc. What would be causing such a low voltage.

I lose ports on this system constantly, I think probably due to the low voltage.

Any help would be appreciated.

 

[ironhorse17]

Wrong forum, this is a Nortel, I believe you want Mitel.

But for your information

CO from the provider -48 VDC.
Analog stations from a KSU normally 24 VDC. Bigger switches -48 to -52 DC.

Ringing voltage from the CO and KSU 90-105 VAC 20 HZ. Certain odd KSU's will put out a 30 HZ frequency.