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Is the HCI Layer Optional?
Original Post: Questions - Link Manager Protocol and Base Band (SIG
Forum ) Date: 2000-06-16
Although the HCI (Host Controller Interface )
directly instructs the Baseband to do these inquiry/paging instructions,
there exist device ,such as cordless phone, which are envisaged to
function without the use of the HCI layer. As far as I know HCI is not
necessary.
This is because the HC layer is actually not
absolutely necessary. It provides a typical standard command interface to
the baseband controller and link manager, and access to hardware status
and control registers. Knowing this it would be up to the developer , and
application/profile setup, to decide whether to implement it. The Cordless
Telephony Profile doesn't use many of the lower features (such as hold,
sniff) so it makes sense for it to not implement the HCI interface, and so
reducing complexity & cost.
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