asterisk users - Jun 2009 - FXO clock

Dear sir
 I build a daughter card to interface the FXO module with blackfin537 stamp
board, but unfortunately I can`t get Dial tone or any other signalling via
fxo port.however the fxo module has been detected on the board.
my daughter card work with clock= 2.048MHZ, and i configure asterisk with
USA signalling.I suspect that the frequency of 2.048MHZ (form E1 TDM frame
) is not suitable for USA signalling as USA work with standard T1 TDM .
am I right or not,are that could make a problem.
Thanks for your help.
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On Sat, 6 Jun 2009, Ayman Hendawy wrote:
> Dear sir
> I build a daughter card to interface the FXO module with blackfin537 stamp
> board, but unfortunately I can`t get Dial tone or any other signalling via
> fxo port.however the fxo module has been detected on the board.
> my daughter card work with clock= 2.048MHZ, and i configure asterisk with
> USA signalling.I suspect that the frequency of 2.048MHZ (form E1 TDM frame
> ) is not suitable for USA signalling as USA work with standard T1 TDM .
> am I right or not,are that could make a problem.
> Thanks for your help.
>
You need to integrate the FXS module if you want dial tone from it.  Are 
you trying to build a digital interface or analog?

j