Microwave networks CM7, User Manual

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Glossary
Page x CM System Users Manual
CCITT — International Telegraph and Telephone Consultative Committee.
C/I — Carrier-to-Interference Ratio.
CLK — Clock.
Codec — Coder/Decoder.
Co-located — located in the same rack, as in two CM radios.
Constellation — The totality of possible signal states used by the modem to send level information. Each point comprising
the pattern is described by I and Q coordinates.
CTIA — Cellular Telecommunications Industry Association.
D
D — D word time or pattern; D frame.
D/A or DAC — Digital-to-Analog Converter.
DADE — Differential Absolute Delay Equalization.
dBm0 — dB above reference noise measured with C-message weighting at 0 transmission level point.
DEC — Double Error Correction.
DEMOD — Demodulator (plug-in module).
DFM — Dispersive Fade Margin, a measure (in dB) of a system's immunity to dispersive fade activity.
DISGAP — Distributed GAP.
Dispersive Fade — A change in propagation condition which affects the shape of the desired channel response. Typically, this
is caused by multipath activity and is equalized by the ATDE and Slope Equalizer.
DIU — Drop and Insert Unit (plug-in module).
DIV — Diversity.
DRO — Dielectric Resonator Oscillator.
DS1 — Digital Signal 1, the primary multiplex level in North American TDM hierarchy (1.544 Mbps).
DS3 — Digital Signal 3, the third multiplex level in North American TDM hierarchy (44.736 Mbps).
DSB — Double Side Band.
DSB-SC — Double Side Band-Suppressed Carrier.
DTMF — Dual Tone Multi-frequency.
DVM — Digital Voltmeter.
E
E1— Primary multiplex level in International TDM hierarchy (2.048 Mbps).
E3— Third multiplex level in International TDM hierarchy (34.368 Mbps).
EFS — Error Free Seconds.
EMC — Electromagnetic Compatibility.