custom local area signaling service

Custom local area signaling service (CLASS) is one of an identified group of network-provided enhanced services. Note: A CLASS group for a given network usually includes several enhanced service offerings, such as incoming-call identification, call trace, call blocking, automatic return of the most recent incoming call, call redial, and selective forwarding and programming to permit distinctive ringing for incoming calls. Source: from Federal Standard 1037C

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control communications
controlled area
controlled security operation
control of electromagnetic radiation
control operation
convolutional code
convoy internal communications
cooperation factor
copy
cord circuit
core

corner reflector
cosmic noise
costas loop
coupling
cover
critical angle
critical frequency
crosstalk
crypto
cryptochannel
crystal oscillator

curve fitting compaction
customer office terminal
customer premises equipment
customer service unit
cutback technique
cutoff frequency
cutoff wavelength
subroutine
data access arrangement
data bank
data compaction

data element
data forwarder
data integrity
data link
data service unit
data signaling rate
data transmission circuit
date time group
db (car)
db(a)
dbm