Bluetooth interview questions - part2

Bluetooth interview questions(Reference Bluetooth spec) 1. Explain Bluetooth stack Ans: From lower layers: Controller part:BR/EDR controller - Software Baseband controller -Hardware HCI - Firmware Link Manager - Firmware Controller part - AMP Controller AMP MAC & PHY - Hardware AMP PAL - Firmware HCI - Firmware Host: Hardware to connect with Controller Physical Bus Firmware(USB,SDIO,Other) Physical Bus Driver HCI Controller driver Other High Level Driver L2CAP Host --> Controller From lower layer Physical Bus Firmware -over physical bus->Physical Bus Firmware HCI Driver-over HCI->HCI Firmware Host can control both BR/EDR controller and several AMP Controllers High level driver-Host1-->userdata-->Higher level driver- Host2 2.What is ACL in Bluetooth? http://en.wikipedia.org/wiki/Asynchronous_Connection-Less 3.Explain RS-232 http://en.wikipedia.org/wiki/RS-232 4.What is sniff? http://developer.nokia.com/community/wiki/Bluetooth_Protocol#Sniff_Mode 5.What is a slot? 6.What is an event? 7.What is Frequency hopping?(AFH) 8.What is Baseband controller? 9.What is paging? 10.What is RFCOMM?