ternary signal

In telecommunication, a ternary signal is a signal that can assume, at any given instant, one of three significant conditions, such as power level, phase position, pulse duration, or frequency. Note: Examples of ternary signals are (a) a pulse that can have a positive, zero, or negative voltage value at any given instant, (b) a sine wave that can assume phases of 0°, 120°, or 240° relative to a clock pulse, and (c) a carrier wave that can assume any one of three different frequencies depending on three different modulation signal significant conditions. Source: From Federal Standard 1037C

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summation check
supervisory program
reduced carrier transmission
surface wave
survivability
switched loop
switched multimegabit data services
synchronism
synchronizing
synchronous network
synchronous orbit

system integrity
system lifecycle
systems control
systems design
tactical communications
tactical communications system
tactical data information link a
tape relay
t carrier
technical control facility
telecommunications service

teleconference
teletraining
terminal adapter
terminal equipment
thermodynamic temperature
third order intercept point
threshold
time assignment speech interpolation
time code ambiguity
minimum spanning tree
time division multiplexing

time domain reflectometer
time out
time scale
t interface
toll switching trunk
total harmonic distortion
traffic flow security
traffic intensity
transceiver
transcoding
transmission