- cable block
- cable circuit
- cable communication
- cable connection
- cable duct
- cable guide
- cable joint
- cable jointer
- cable manhole
- cable network
- cable path
- cable screen
- cable section
- cable shoe
- caging device
- calibrated generator
- calibrating cable
- call attempt
- call duration
- call finder
- call gate
- call letter
- call macro
- call queue
- call store
- call transfer
- callback
- called telephone
- calling procedure
- callout table
- cancel command
- cancel request
- candidate cells
- busy flag
- busy hour
- busy line
- busy number
- busy tone
- Butler oscillator
- Butterworth filter
- cable manager
- cable plug
- cable socket
- cable system
- cable test
- cache
- cachia attenuator
- caesium phototube
- calculator chip
- calendar manager
- calibrated signal
- calibration error
- calibration service
- call diverter
- call hold
- call identification
- call office
- call origin
- call sequence
- call string
- called station
- calling key
- calling part
- cancel character
- cancellation completed
- capitive test
- capture effect
- byte timing
- cable assembly
- cable cutter
- cable distribution
- cable operator
- cable television
- caisson disease
- calibrated scale
- calibration level
- call circuit
- call distributor
- call held
- call identifier
- call metering
- call phases
- call retrieval
- call sender
- call slip
- call waiting
- called part
- caller
- calling channel
- calling order
- calling telephone
- camera tube
- cable pit
- cable ship
- cable termination
- caesium clock
- cage antenna
- call
- call charge
- call control