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List of terms 75
Digital signal
A signal made up of discrete, non-continuous pulses whose information is
contained in theirduration, periods, and/or amplitude.
Directory number
DSL
DTE
DTI
DTR
EIA
EMI
ESN
Failure rate
Firmware
FM
The four-digit number or extension given to a Meridian SL-1 telephone set.
Also known as DN.
Digital Subscriber Loop.
Data Terminal Equipment.
Digital Trunk Interface.
Digitone Receiver.
Electronics Industry Association.
Electromagnetic Interference. Unwanted electromagnetic coupling.
Examples are ham radio heard on electric organs and church music heard in
hearing aids. Also known as QRM or “static.”
Electronic Switched Network.
The estimated number of failures for that item during one million (106)
hours of operation.
A set of instruction sequences stored permanently in hardware (ROM).
Frequency Modulation; A process whereby the frequency of a previously
single frequency carrier wave is varied in step with the amplitude of a
complex modulating wave. Also means Fully Modular.
System overview 553-3001-100
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