atcomsystems.ca/forum Forums TDM Business Telephone Systems NEC Telephones & Systems In SV8300,single line voltage is 108.8 DC Volts

Ok so when you replaced the CPU it was normal for a short period then went up, this to me indicates that the higher voltage is being switched on by software. Is there any PMS system connected? How did you check Message wait? Do you have a PMS simulator?

we do not have neither PMS, nor PMS simulator connected.

Do you have an older back up of the system, if so load it into your spare CPU and put that in and see if the voltages stay normal, If not, default the CPU and see if they stay normal.

That should prove whether it is hardware or software related.

yes I did have an older backup which is 6 months older than the current system data, and when the older backup was loaded, the voltage reading restored to normal for a few minuets only, and then it goes up to 108 Volts...and the same thing occurs when the current system data is loaded to the CPU...! if you refer to my first post you will notice the same behavior when I replaced the CPU card.

Have you tried making your own 8p8c connector and plugging in and testing them? Make sure there is not voltage being introduced in your cross connects from somewhere.

Definitely a weird one!

Ok but have you tried it with a defaulted CPU as we don't know how long the problem has existed.

If it goes up with a defaulted CPU, it basically means a hardware problem and you will probably end up having to talk to NTAC,

to oobie;
thank you for posting, the first thing we did here was taking out all the cables from their sockets on the LC cards...and testing on the sockets themselves....! of course we used a separate cable and the reading was ~(108).

any one can help on this issue? we are still facing this problem...!

The voltage number is what is getting my attention. It's almost what all 4 would produce. The only time I have seen something like that was water damage.

Still waiting to hear if it happens with a defaulted CPU?