User's Manual
56•GlossaryPhysioTelDigitalConfigurationManual
Glossary
1. CCA = Clear Channel Assessment: The clear channel assessment operation determines whether the
wireless medium is busy or idle. The MAC layer can then make a decision on whether to send a frame.
2. CLC = Communication Link Controller: Processes telemetered data to/from the TRX for communications
over the Ethernet connection.
3. Firmware: The combination of a hardware device and computer instructions and data that reside as read-
only software on that device.
4. IP Address = Internet Protocol address is a numerical label assigned to each device participating in a
computer network that uses the Internet Protocol for communication.
5. Listen Before Talk (LBT), or sometimes called Listen Before Transmit: A technique used in radio
communications whereby a radio transmitter first senses, or surveys, the radio environment before it starts
a transmission.
6. MAC Address = Media Access Control Address: A unique identifier assigned to network interfaces for
communications on the physical network segment.
7. RSSI = Received Signal Strength Indicator (or Indication): A signal or circuit that indicates the strength
of the incoming (received) signal in a receiver.
8. TRX = Transceiver: Component that receives Radio-Frequency signals and converts it into digital form
that is sent, via cable, to the Communication Link Controller; additionally, the component that transmits
Radio-Frequency signals converted from digital form sent via cable, from the Communication Link
Controller.