Channel
Either a physical channel or an L2CAP channel, depending on the context.

Connect (to service)
The establishment of a connection to a service. If not already done, this also includes establishment of a physical link, logical transport, logical link and L2CAP channel.

Connectable device
A Bluetooth enabled device in range that periodically listens on its page scan physical channel and will respond to a page on that channel.

Connecting
A phase in the communication between devices when a connection between them is being established. (Connecting phase follows after the link establishment phase is completed.)

Connection
A connection between two peer applications or higher layer protocols mapped onto an L2CAP channel.

Connection Establishment
A procedure for creating a connection mapped onto a channel.

Cordless Telephony Profile (CTP)
The CTP defines how a cordless phone can be implemented over a Bluetooth wireless link. This profile can be used for either a dedicated cordless phone or a mobile phone that acts as a cordless phone when in proximity to a base station implementing the CTP. It is anticipated that mobile phones could use a Bluetooth CTP gateway connected to a landline when within the home, and the mobile phone network when out of range.

Coverage Area
The area where two Bluetooth enabled devices can exchange messages with acceptable quality and performance.

Creation of a Secure Connection
A procedure of establishing a connection, including authentication and encryption.

Creation of a Trusted Relationship
A procedure where the remote device is marked as a trusted device. This includes storing a common link key for future authentication and pairing (if the link key is not available).

Device Discovery
A procedure for retrieving the Bluetooth device address, clock, class-of-device field and used page scan mode from discoverable devices.

Dial-up Networking Profile (DUN)
DUN provides a standard to access the Internet and other dial-up services over Bluetooth wireless technology. The most common scenario is accessing the Internet from a laptop by dialing up on a mobile phone, wirelessly.

Discoverable Device
A Bluetooth enabled device in range that periodically listens on an inquiry scan physical channel and will respond to an inquiry on that channel. Discoverable device are normally also connectable.