Telephone Line Emulator User’s Manual
40-400-00020, Rev. M 124
CE
Customer Equipment, see CPE
CEAS
Customer Equipment Alerting Signal, see CAS.
CID
See Caller ID.
CLIP
Calling Line Identification Presentation, see Caller ID.
C.O.
Central Office, a term used to describe the central location of switching equipment.
CPE
Customer Premise Equipment. Telephone products that reside at the customer location.
DDN
Dialable Directory Number. The number that the called party is required to dial to return a
call to the calling party.
DIT
Display Information Transfer
DT-AS
Dual Tone Alerting Signal, see CAS.
DTMF
Dual Tone Multi Frequency. The technical term for touchtones; a combination of two
tones.
ETSI
European Telecommunications Standards Institute, Central Office
Telephone company facility where subscribers lines are joined to switching equipment for
connecting other subscribers to each other, locally and long distance. (Also called CO.)
CIDCW
Caller ID in Call Waiting - Bellcore term for Caller ID sent during an active call. Also
known as Type 2 Caller ID.
dB
The decibel is a unit measurement used to express the ratio between two signals.
dBm
Decibel measurements compared to a 1 milliwatt signal referenced to a 600 ohm or 900
ohm load.
dBrn
Decibel measurements compared to a Reference Noise. The Reference Noise level is -90
dBm = 0 dBrn.
DTMF
Also called touchtone. Dual-tone multi-frequency. Push-button telephone signaling.
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