En 2.4, ztdummy utilise l'usb UHCi pour obtenir une horloge à 1kHz, si on ne possede pas de carte en fournissant (les cartes digium fournissent cette horloge).
"On a 2.6 kernel–based distribution, ztdummy does not require the use of the USB controller. (As of v2.6.0, the kernel now provides 1-kHz timing with which the driver can interface; thus, the USB controller hardware requirement is no longer necessary.)"
[^] # Re: conference
Posté par Az' (site web personnel) . En réponse au journal Installer Asterisk. Évalué à 1.
"On a 2.6 kernel–based distribution, ztdummy does not require the use of the USB controller. (As of v2.6.0, the kernel now provides 1-kHz timing with which the driver can interface; thus, the USB controller hardware requirement is no longer necessary.)"
source: Asterix, The Future of Telephony - Jim Van Meggelen, Jared Smith, and Leif Madsen, page 36
http://www.asteriskdocs.org/modules/news/
http://www.oreilly.com/catalog/asterisk/index.html