APPENDIX A — ABBREVIATIONS AND DEFINITIONS
CD: Carrier Detect
CSMA: Carrier Sense Multiple Access
CTS: Clear To Send
CWID: a station identifier or “call sign” broadcast in
Morse code at specified periodic intervals to identify
the broadcasting radio
DCD: Data Carrier Detect
DOX: Data Operated Transmit
DSR: Data Set Ready
DTR: Data Terminal Ready
EIRP: Effective Isotropic Radio Power
FCC: Federal Communications Commission (United
States)
FPS: Field Programming Software
FSK: Frequency-Shift Keying, an electronic
communications modulation scheme
IC: Industry Canada
PA: Power Amplifier
PCB: Printed Circuit Board
PTT: Push To Talk
RF: Radio Frequency
RS-232, RS-422, RS-485: Standard Serial
communication protocols
RSSI: Received Signal Strength Indication
RTS: Request To Send
Rx: Receive
SMA: SubMiniature version A (connector)
TNC connector: Threaded Neill-Councelman connector
Tx: Transmit
VDC: Voltage, Direct Current
Guardian™ Serial Modem or Analog Radio for Licensed Spectrum PN 001-5006-000 Rev. 3 | Page 60
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