IBM 3745 Series Service Functions page 294

FOX
full-duplex (synonym for duplex) IML initial microcode load
FE
field engineering
in.
inch
FEIS field engineering information system
INN intermediate network node
FERR
FESA error register INOP inoperative (line, modem, or terminal)
FES front-end scanner
INS information network system
FESA front-end scanner adapter 10C input/output control
FESH front-end scanner (high-speed) 10 input/output
FESL front-end scanner (low-speed) 10CB input/output control bus
FID4 format identification 4 10CS input/output control system
FM frequency modulation 10lRR input/output interrupt request register
FPS FES parameter/status 10SW input/output switch (card)
FRU field-replaceable unit IPF instruction pre-fetch
ft foot IPL initial program load
GPR general purpose register IPR isolated pacing response (SNA)
GPT
generalized PIU trace IR interrupt request
GTF generalized trace facility
IRR interrupt request removed
HCS Hardware Central Service ISDN integrated service digital network
HOD
hard disk drive ISL inbound serial link
HDX half-duplex ITB intermediate text block (BSC)
hex hexadecimal ITER IOC bus terminator
hh hexadecimal value hh IVT isolation verification tests
HLiR high-level interrupt request K 1024 (bytes or words)
HLU highest logical unit (largest CPU in an KBD keyboard
establishment)
kbps kilobits per second
HPTSS high-performance transmission sub-
kHz kilohertz
system
HSB high-speed buffer
ko not ok
HSC
high-speed channel
LA line adapter
HSS high-speed scanner
LAB line adapter board
HW hardware
LAN local area network
Hz
Hertz
LAP line adapter processor
indication (signal)
LAR lagging address register
lACK interrupt acknowledgement
LCB line control block (storage)
IAR instruction address register
LCD line control definer (storage)
IBE internal box error
LCS line communication status (storage)
ICA integrated communication adapter
LDF line description file
ICB
interface control block (storage)
LED light-emitting diode
ICF internal clock function
LERR line error register/driver check
ICW interface control word
LIB
line interface buffer
10 identifier
LlB1
L1C board type 1 for L1Cs 1, 3, and 4
1FT internal function test
L1B2 L1C board type 2 for L1Cs 5 and 6
1MB in mailbox (MOSS)
L1C
line interface coupler card
List of Abbreviations
X-3