[Asterisk-Users] TDM400P problems

[Martin]

On Friday 02 September 2005 09:33, Martin wrote:
> On Friday 02 September 2005 07:47, Alex Ongena wrote:
> > > > This is a well-known issue with the current drivers, although
> > > > nobody's really stepped up to identify when exactly this started
> > > > happenning (as the driver code was changed) or why.

> Interesting.
>
> I have just re-installed asterisk with the digium dev kit (Xp100 and
> TDM400P) and have problems with TDM400P port #3.  I also see an issue with
> lack of drive to the phones.  The more phones I add, the more ring issues. 
> I can 'fix'  the issue by switching phones.  The docs
>
>  ( http://www.intervoice.com/_docs/.433/601016.PDF )


I just ran some tests.

The US FCC specs are:-

Standing voltage	=	-48 VDC (minus)
Ringing voltage	=	85 - 105 VAC
current supplied	=	20 to 50mA (I haven't checked this as I would have to 
create a break and bridge with the digital multi-meter)

My line from the central office
Standing voltage	=	-51.1 VDC (minus)
Ringing voltage	=	90.7 VAC

Port #1
Standing voltage	=	-48.4 VDC
Ringing voltage	=	42.7 VAC

Port #2
Standing voltage	=	-48.2 VDC
Ringing voltage	=	42.7 VAC

Port #4
Standing voltage	=	-44.4 VDC
Ringing voltage	=	43.5 VAC

It looks like my card/modules, are not providing the required ring voltage.  

Anyone else checked their voltages ?

Regards...Martin