[Asterisk-Users] Ring power on Analog adapters

[Jorge Mendoza]

I assume that you have tested a analog phone with your ATA and it works. 
If this is true, I suspect that your fax machine does not work with 24 
VDC but 48 VDC. POTS line and old PBX supply -48 VDC.

Jorge

mattf wrote:

>Hello,
>
>Ok, I've tried tinkering with the ring voltage (this is an editable variable
>on the Sipure SPA-2000) and I still can't get it to work. I plug a generic
>POTS line in and it works, I plug an analog port from our old Comdial PBX in
>and it works. 
>
>with the sipura adapter I've tried changing the ring voltage in the range
>(20V to 90V) and the frequency from 10Hz to 100Hz both in 5 step increments
>and nothing seems to work.
>
>Do these analog -> SIP VOIP adapters truely supply the 24V that a POTS line
>supplies?
>
>Anybody have any ideas why this fax machine won't work with any analog
>adapter I've tried?
>
>
>Thanks,
>
>MATT---
>
>
>-----Original Message-----
>From: Jorge Mendoza [mailto:mendoza at tcc.com.pe]
>Sent: Monday, November 24, 2003 2:07 PM
>To: asterisk-users at lists.digium.com
>Subject: Re: [Asterisk-Users] Ring power on Analog adapters
>
>
>24 VDC and 20 mA are loop current parameters. Ringing are into the range 
>of 50-90 VAC and 15-30 Hz.
>
>Jorge
>
>mattf wrote:
>
>  
>
>>Hello,
>>
>>I have a big old Fax machine that will only pick up a ring at 24volts and
>>20mA(minimum) ring[according to the technical specs manual]. None of my SIP
>>-> Analog phone adapters supply this:
>>
>>Cisco - 50 volts
>>SIPURA - 70 volts
>>Handytone - who knows, but it doesn't work
>>
>>can anyone tell me if there are any analog adapters or channel banks that
>>can send a 24V 20mA ring signal?
>>
>>Also, does anyone know what voltage the Digium analog PCI cards send out
>>    
>>
>for
>  
>
>>ring?
>>
>>Thanks,
>>
>>MATT---
>>_______________________________________________
>>Asterisk-Users mailing list
>>Asterisk-Users at lists.digium.com
>>http://lists.digium.com/mailman/listinfo/asterisk-users
>> 
>>
>>    
>>
>
>  
>