NEC Univerge SV8500 Programming Manual page 28

This table identifies the function name of each line/trunk interface and switching controller.
SYMBOL
ATI Attendant Console Interface
BRT Basic Rate Interface Trunk
BWT Bothway Trunk
CCH Common Channel Handler
CFT Conference Trunk
COT Central Office Trunk
DCH D-Channel Handler
DID Direct Inward Dialing
DIT Direct-In Termination
DLC Digital Line Circuit
DOD Direct Outward Dialing
DTI Digital Interface
ELC Electronic Line Circuit
EMT E & M Trunk
IOC Input/Output Controller
IRT Incoming Register Trunk
LC Line Circuit
LDT Loop Dialing Trunk
LTST Line Test
MDF Main Distribution Frame
MUX Multiplexer
NCU Night Connection Unit
ODT Outband Dialing Trunk
ORT Outgoing Register Trunk
PRT Primary Rate Interface Trunk
SND Sender
TLT Tie Line Trunk
TSW Time Division Switch
DESCRIPTION
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CHAPTER 1 INTRODUCTION