D110P E1/t1 card internal timing source

Dear OpenVox guys

Do you have any idea whether D110P E1/T1 card has its own internal timing source or not?
If so, could you please let me know how to configure the Asterisk server to enable to do it?

Thanks in advance and Best Regards,
Mizuki

it have internal timing source in zaptel.conf, use such style to enable internal timing source:

span=x,0,.....

the 2nd number =0 means use internal timing( timing master)
=1 means use timing from e1 cable, ( external timing)