Circuit switching
A process that, on demand, connects two or more data terminal equipments and permits the exclusive use of a data circuit between them until the connection is released (ISO).
AB
SITA
Communications number assigned by Societe Internationale de Telecommunications Aeronautiques (SITA).
AC
ARINC
Communications number assigned by Aeronautical Radio Inc.
AD
Courier
A communication channel identifying a courier.
CA
Cable address
Self explanatory.
EI
EDI transmission
Number identifying the service and service user.
EM
Electronic mail
Exchange of mail by electronic means.
EX
Extension
Telephone extension.
FT
File transfer access method
According to ISO.
FX
Telefax
Device used for transmitting and reproducing fixed graphic material (as printing) by means of signals over telephone lines or other electronic transmission media.
