3.1 Terms. Definitions needed for the technical understanding of this standard are found
in the current version of FED-STD-1037. For the purposes of this standard, definitions are
provided for the following terms, some of which have been repeated from FED-STD-1037 for
the convenience of the reader.
- Automatic link establishment (ALE).: The capability of an HF radio station to make contact,
or initiate a circuit, between itself and another specified radio station, without operator
assistance, and usually under processor control.
NOTE: ALE techniques include automatic signaling, selective calling, and automatic
handshaking. Other automatic techniques that are related to ALE are channel scanning and
selection, link quality analysis (LQA), polling, sounding, message store and forward,
address protection, and anti-spoofing.
- Balanced to ground.: Pertaining to electrical symmetry with respect to a common ground.
- Clear-to-send (CTS) signal.: The control signal generated by the transmitting modem on the
CTS connection to denote a state of readiness for transmission. The CTS signal is a response to
the request-to-send (RTS) signal from the transmitting device.
- Code rate.: The ratio of the number of information symbols (k) to the total number of
encoded symbols (n) in a code (i.e., the ratio of k/n).
- Mode.: An available format in a data modem supporting multi-waveform capability.
- Narrowband.: At HF radio frequencies (1.5 - 30 MHz) the nominal voice frequency (VF)
bandwidth allocated for single channel radio (i.e., 3 kHz).
- Nominal bandwidth.: The widest band of frequencies, inclusive of guard bands, assigned to a
channel.
- Preamble code.: A short sequence of symbols at the beginning of a coded sequence used to
achieve synchronization.
- Request-to-send (RTS) signal.: The control signal generated by the transmitting terminal on
the RTS connection to denote a request for transmission.
- Secure voice.: A voice communication that is protected against compromise through the use
of an encryption system.
- Unbalanced to ground.: Pertaining to electrical asymmetry with respect to a common ground.
NOTE: Frequently, the term "unbalanced" describes a circuit, one side of which is
grounded.
- Wideband.: At HF radio frequencies (1.5 - 30 MHz) a bandwidth larger than 3 kHz.
3.2 Abbreviations and acronyms. The abbreviations and acronyms used in this document
are defined below. Those listed in the current edition of FED-STD-1037 have been included for
the convenience of the reader.
- ABCA: American, British, Canadian, Australian (armies)
- ACK: acknowledgement
- ALE: automatic link establishment
- ANC: automatic node controller
- AND: Logical AND
- ANDVT: Advanced Narrowband Digital Voice Terminal
- ANSI: American National Standards Institute
- ARQ: automatic repeat-request
- Bd: baud
- BER: bit error ratio
- bit: acronym for binary digit
- b/s: bits per second
- BW: bandwidth
- CCIR: International Radio Consultative Committee
- CRC: cyclic redundancy check
- CTS: clear to send
- CTX: clear to transmit
- dB: decibel(s)
- dBm: dB referred to one milliwatt
- dBmØ: noise power in dBm referred to or measured at ØTLP.
- DCD: data carrier detect
- DCE: data circuit-terminating equipment
- DO: design objective
- DPSK: differential phase-shift keying
- DTE: data terminal equipment
- EIA: Electronic Industries Association
- EOM: end of message
- FEC: forward error correction
- FED-STD: Federal Standard
- freq: frequency
- FSK: frequency-shift keying
- FTSC: Federal Telecommunications Standards Committee
- HF: high frequency
- Hz: hertz
- IAW: in accordance with
- IC Ckt: Interchange circuit
- ID: identification
- I/O: input/output
- ISO: International Organization for Standardization
- ITU: International Telecommunication Union
- kHz: kilohertz (1,000 hertz)
- LF: low frequency
- LQA: link quality analysis
- LSB: least significant bit
- MF: medium frequency
- MGD: modified-Gray decoder
- MHz: megahertz (1,000,000 hertz)
- MIL-STD: military standard
- modem: modulator-demodulator
- ms: millisecond(s)
- MSB: most significant bit
- NAK: negative acknowledgment
- no.: number
- NATO: North Atlantic Treaty Organization
- OR: logical OR
- OSI: Open Systems Interconnection
- PSK: phase-shift keying
- PTT: push-to-talk
- QDPSK: quadrature differential phase-shift keying
- QSTAG: Quadripartite Standardization Agreement
- RA: receive audio
- RATT: radio teletypewriter system
- RC: receive clock
- RCE: radio communications equipment
- RD: receive data
- rf: radio frequency
- rms: root-mean-square
- RS: receive (HF radio) signal
- RTE: radio terminal equipment
- RTS: request to send
- RTX: request to transmit
- R/T: receiver/transmitter (transceiver)
- s: second(s)
- SNR: signal-to-noise ratio
- STANAG: Standardization Agreement (NATO)
- sync: synchronization
- TA: transmit audio
- TACTERM: tactical terminal
- TC: transmit clock
- TD: transmit data
- TIA: Telecommunications Industry Association
- TLP: transmission level point
- TS: transmit (HF radio) signal
- TX: transmit
- UHF: ultra high frequency
- VF: voice frequency
- VHF: very high frequency