IBM 3745 Series Service Functions page 293

CRQ
call request
OSC
distant station connected
CRU
customer replaceable unit
OSR
data set ready (signal)
CS
1) cycle steal
OSRS
data signaling rate selection (signal)
2) communication scanner
OSU
data service unit (DCE-like for high-
CSA
common subassembly
speed communication lines)
CSCW
cycle steal control word
OTE
data terminal equipment
CSG
cycle steal grant
OTER
DMA bus terminator
CSGH
cycle steal grant high
OTR
data terminal ready (signal)
CSGL
cycle steal grant low (card)
OVB
device block
CSP
communication scanner processor
OX
duplex
CSR
cycle steal request
EBCDIC
extended binary-coded decimal inter-
CSRH
cycle steal request high
change code
CSRL
cycle steal request low
EC
engineering change
CSS
control subsystem
ECC
error checking and correction
CSU
1) customer setup
EDE
elementary data exchange
2) customer service unit (DCE-like for
ED/FI
error detection/fault isolation
high-speed communication lines)
EIA
Electronic Industries Association
CSW
channel status word
EIB
error intermediate block
CTS
clear to send (signal)
ELCS
extended line communication status
CW
control word
EMEA
Europe, Middle East, Africa
OAF
destination address field (SNA)
ENQ
enquiry (BSC)
DB
data byte
EOT
end of transmission (BSC)
DC
data chaining (channel status)
EP
emulation program
OCE
data circuit-terminating equipment
EPO
emergency power-off
DCF
diagnostic control function
ERC
error reference code
DCM
diagnostic control monitor
EREP
environmental recording, editing, and
OCRLSD
data channel receive line signal printing (program)
detector (same as CD)
ERP
error recovery procedure
DE
device end (channel status)
ESC
emulation subchannel (address)
OFA
disk file adapter card
ESCH
emulation subchannel high (address)
OFI
defect-free installation
ESCL
emulation subchannel low (address)
OlFF
differentiator
ESO
electrostatic discharge
OLE
data link escape character
ESS
Ethernet"'" subsystem
OLO
data line occupied (signal)
ETB
end-of-transmission block character
OMA
direct memory access (BSC)
OMSW
direct memory access switch card
ETX
end-of-text character (BSC)
OMUX
double multiplex card for board on L1C
EXP
expected
unit 1
FAC
flag address control (SDLC frame)
001
duration of interrupt
FCC
Federal Communications Commission
DP
digit present (signal)
FCPS
final call progress signals (X.21)
OPR
digit present request
FCS
frame check sequence
DRS
data rate select
FDO
flexible disk drive
ORV
driver
FOS
flat distribution system
X-2
3745 Communication Controller