Bluetooth Flashcards
(14 cards)
method which allows devices to communicate with each other eliminating the need for cables;
allows paired devices to communicate within a certain distance range
bluetooth
short range wireless technology used for the exchange of data in between a mobile and fixed device over Ultra High Frequency (UHF) radio waves 2.402 GHz to 2.48 GHz;
Uses Frequency Hopping Spread Spectrum (FHSS)
bluetooth
method of transmitting radio signals by shifting carriers across numerous channels with pseudo random sequences which is already known to the sender and receiver;
rapidly changes carrier frequencies to avoid interference, eavesdropping and to enable CDMA (Code Division Multiple Access)
Frequency hopping spread spectrum (FHSS)
There’s a spectrum of frequencies. Bluetooth will hop around channels; point is to avoid eavesdropping
Frequency hopping spread spectrum (FHSS)
Bluetooth is a packet-based protocol that forms a network known as _____. Known as a parent child relationship
Piconet
The parent’s clock will determine how data packets are moved through the _____. During device discovery, device generates an inquiry hopping (channel changing) sequence.
Devices Discover eachother. Once they pair they become piconet. They use parents clock which sets timing for packets sending. Access code becomes created as well
piconet
FHS packet includes the parent’s Bluetooth address and clock
device such as the mobile. The host is responsible for higher-layer protocols
Bluetooth Host
built-in chip into the mobile device attempting to understand the connection commands
Bluetooth Controller
transport protocol running on top of L2CAP;
emulated RS-232 serial ports to communicate with upper layer profiles
Radio frequency communication (RFCOMM)
adaption between upper layer frame and baseband layer frame format;
Packet-based protocol
Logical Link Control and Adaptation Protocol (L2CAP)
Authentication, encryption, pairing
Link Manager Protocol (LMP)
physical structure and specifications for transmission of radio waves;
Final layer of framing for a packet
Baseband
determine the frequency hopping pattern in radio communication;
48-bit value that uniquely identifies a Bluetooth device/specification
BD_ADDR
Is the host or the controller responsible for lower-layer functions such as frequency hopping?
Bluetooth Controller
