AppleTV 3rd - optical audio output 44.1/48KHz

hi there,

i've a problem with the Apple TV (3rd generation) optical audio (Toslink) output. I send a 44.1KHz stream from a MacBook (OSX 10.9.1) / iTunes (11.1.4 (62)) via a wired connection (ethernet 802.3) and the optical output on the AppleTV is a 48KHz stream.

in the same case using an AirPort Express, the optical output is a correct 44.1KHz stream.

is it a correct behavior?

where is the problem?

what can i do?

thanks ahead,

sergio