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Abbreviations AB-3
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EPROM Erasable Programmable Read Only Memory
ES Enhanced Services
ESS Electronic Switching System
ETN Electronic Tandem Network
EUCD Enhanced Uniform Call Distribution
FAC Feature Access Code
FP Feature Processor (Subsystem)
FP-BI FP Bus Interface (TN716B)
FP-CPU FP Central Processing Unit (TN523 or TN591)
FP-PE FP Processor Element (includes BI, CPU, and RAM)
FP-RAM FP Random Access Memory (TN734)
FSD Fixed Storage Drive (AUDIX-L)
FSW Failure Status Word
GND Ground
GPP General Purpose Port (SN270B)
HDD Hard Disk Drive (AUDIX)
HDLC High-Level Data Link Controller
ID Identification
IDI Isolating Data Interface
INADS Initialization and Administration System
INT Interface Board 1 to 3 for System 75 SCI
IPC Intelligent Peripheral Controller (TN507C on AUDIX-L)
ISCN Information Systems Change Notice
ISDN Integrated Services Digital Network
ISLU-T Integrated Services Line Unit — T Interface
K or Kbyte Kilobyte (1024 bytes)
LADS Local Area Data Set
LAT Local Administration Terminal
LDN Listed Directory Number
LEC Local Exchange Carrier
LED Light-Emitting Diode
LMT Local Maintenance Terminal
LWC Leave Word Calling