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DEFINITY ECS Release 8.2 ATM Installation,
Upgrades, and Administration
555-233-124
Issue 1
April 2000
Glossary and Abbreviations
GL-3
ESCC
Enhanced single-carrier cabinet
ESI
End System Identifier
E
FNPA
Foreign Number Plan Area—in the North American Numbering Plan, any area code other than the
caller’s own area code. An FNPA ARS call specifies a 10-digit address (optionally preceded by a
‘1’ toll prefix), the first three digits of which specify the area code, or number plan area. In some
locations (typically where area codes are overlaid), it is necessary to dial the NPA even for a local
call.
H
HNPA
Home Number Plan Area—in the North American Numbering Plan, the caller’s own area code. An
HNPA ARS call is usually a 7-digit call (perhaps preceded by a ‘1’ toll prefix) for which the local
area code is implied. In some locations, HNPAs are overlaid (2 or more used in the same location),
requiring 10-digit dialing; in effect, there is no HNPA for such locations.
HO-DSP
High-Order Domain Specific Part
I
ICSU
Integrated Channel Service Unit
ILMI
Integrated Layer Management Interface
INS
Lucent’s Data Network Systems
ISDN
Integrated Services Digital Network
L
LAN
Local area network