NEC 2400 Integration Manual page 138

Abbreviations
O
OA&M
operations, administration, and maintenance
OP
operate
OS
operating system
P
PBX
private branch exchange
PC
power converter or personal computer
PDM
processor data module
PEC
price element code
POST
power-on self test
R
RAM
random-access memory
REN
ringer equivalence number
RMV
remove
RNA
ring-no-answer
ROM
read-only memory
ABB-4 Issue 2 December 1995
RSC
route restriction class
RTS
request to send
RTU
right to use
S
SCSI
small computer systems interface
SID
switch integration device
SFC
service feature class
SFI
service feature index
SIMM
single in-line memory module
SMDI
simplified message desk interface
SMSI
simplified message service interface
STN
station
STRC
Sales and Technical Resource Center
SW
switch integration (INTUITY software component)
SYS
system