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20-8 List of terms
DTCI
See ISDN digital trunk controller.
DTMF
See dual tone multifrequency signaling.
DTO
direct termination overflow
dual-tone multifrequency signaling
A signaling method that uses set combinations of two specific voice-band
frequencies, one of which is selected from a group of four low frequencies,
and the other from a group of three or four relatively high frequencies.
DWS
See Dialable Wideband Service.
E.164
ISDN numbering plan (enhances E.163 and retains X.121)
EANT
See equal access network trunk.
ECF
echo canceller failures
EML
See expected measured loss.
Enhanced Voice Services
Services that provide the capability of menu routing, announcements, and
voice mail. An enhanced voice services (EVS) switch has a PRI interface to
an EVS audio response unit (ARU).
equal access network trunk
Allows access to the trunk side of the equal access end office and also may
connect to access tandem switches. These trunks are known as FGD trunks.
They support both multifrequency and CCS7 signaling.
ESF
extended superframe format
ETS
enhanced time switch
ETSI
See European Telecommunications Standards Institute.
297-2521-106 Standard 23.01 March 2001
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