[Asterisk-Users] OLD PA system.

[John Novack]

Bob Chiodini wrote:

> You might put 600 ohm/600 ohm matching transformer to isolate the port 
> and the amp.  Should also maintain loop current if needed.
>
> Bob...
>
FXO ports do not  generate loop current, they detect loop current from 
the Central office.
Think of an FXO as  a controllable switch and matching transformer.
An FXO port will give Asterisk/Zaptel a red alarm without loop current, 
so that probably won't work for a PA system that doesn't supply battery.
What's wrong with using the (usually) unused sound card built into many 
machines?

John Novack

> Jerry Jones wrote:
>
>> use an fxo interface and 600ohm input on amp
>>
>>
>> On Jun 11, 2006, at 9:53 AM, Thomas Kenyon wrote:
>>
>>> Doug Lytle wrote:
>>>
>>>> Thomas Kenyon wrote:
>>>>
>>>>> I need to be able to connect an old PA system to an asterisk box, 
>>>>> which
>>>>> basically works as a couple of amplifiers taking an analogue phone
>>>>> signal and playing whatever it produces out of some speakers. 
>>>>> There is
>>>>>
>>>> Does the connection use 2 screws for analog inputs?
>>>
>>> Yup.
>>>
>>>> If this is the case, you could get a cheap Grand Stream BT102 and pull
>>>> the speaker leads off and connect it to that box.  The GS can be setup
>>>> to auto answer.
>>>>
>>>> Doug
>>>>
>>>>
>>> I'm going to try the suggestion in the Bat Phone thread above, bringing
>>> one of the PAP2s out of retirement.
>>>
>>> Wish me luck.
>>>
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