NEC Pro 1

[MrComputerTelephony]

I have and old Pro 1 system that I connected an ADA (2) underneath the Phone.The phone is told to ring in programming but the ADA does not ring the analog set connected to it.It does let me draw dial tone,but will won't ring.Thanks for the help.

 

[PFD45]

As I recall, the ADA did not supply ring voltage.

A similar add on board, the APR-U did supply ring voltage but also used an AC adapter.

If there is no provision for an AC adapter on your ADA then you're not going to get ring voltage. 90v AC cannot be sent down the same pair that a Dterm uses.

 

[MrComputerTelephony]

Thanks for the reply.The ADA(2) I have did come with a power supply.

 

[PFD45]

I'm curious about the system. I've never heard of an NEC Pro 1.
There is an Electra Professional sometimes referred to as an EPro?
Also, do you know the model of the phone?
Here's some info on connecting an ADA-2R to a Dterm Series I.

The following switch settings are used when connecting a ADA-2R to a Dterm Series I:

DSW1 : 1,2,7,8 = OFF 3,4,5,6 = ON
DSW2 : 1,2,3 = OFF 4 = ON
SW1 : 2
SW2 : 1
SW3 : 2

 

[belevedere]

The EPro I was released along with the EPro-II. It was a smaller system contained in a plastic wall mounted cabinet. Expansion cards mounted on the mother board. It did not have card slots. You are correct about the two different ADA units. The one that provided ringing needed an external PSU.