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TM 11-5895-878-14&P
APPENDIX B
ABBREVIATIONS
The following is a listing of abbreviations used throughout this technical manual:
Abbreviation
Definition
Abbreviation
Definition
AC
Alternating current
LBAD
Lexington-Blue Grass Army Depot
ACC
Army Communications Command
MAJ
Major
ALM
Alarm
MIN
Minor
AMP
Ampere
MISC
Miscellaneous
AMPL
Amplifier
MOB
Mobile
AQRMS
Automatic Quality Reporting, Monitoring System
MOD
Modulator
AUTO
Automatic
MODEM
Modulator-Demodulator
AUTOVON Automatic Voice Network
MON
Monitor
BATT
Battery
Mux
Multiplex
CAU
Crypto Ancillary Unit
MWO
Modification Work Order
CCO
Circuit Control Office
NC
Normally closed
CCOC
Communications Command Operations Center
NCS
National Communication System
CCU
Common Control Unit
NO
Normally open
CH
Channel
NT
Normally through; no transition
CKT
Circuit
OL
Open loop
COM
Common
O&M
Operation and Maintenance
CR
OSC
dB
Decibel
O/W
Orderwires
dBm
decibel (referenced to 1 mw across 600 ohms)
PBX
Private Branch Exchange
dBmO
dBm referenced and measured from any relative .
PC
Printed circuit
transmission level
PS
Power supply
dBrn
decibels above the standard reference noise level of
P&T
Patch and test facility
-90 dbm
Q
Integrated circuit or transistor
dBrnc
decibels above the reference noise level when the noise  QA
Quality assurance
is weighted with a standard "C message" filter
QC
Quality control
dBrncO
dBrnc referenced and measured from any relative noise  R
Resistor, a ring lead
level
REC
Receive
DC
Direct current
RX
Receiver
DCS
Defense Communication System
RMS
Root mean square
DEMOD
SCCO
Special Circuit Control Office
DL
Drawing list
SG
Signal ground
DOCC
DCA Operations Control Complex
SOP
Standard Operating Procedures
EL
Equal level
T
Tip lead, or transformer
EQ
Equipment
TCF
Technical Control Facility
Equip
Equipment
TMS
Transmission measuring set
FREQ
Frequency
TRANS
Transmit
GND
Ground
TSO
Telecommunications Service Order
GP
Group
TTY
Teletypewriter
HF
High frequency
TX
Transmit
HP
Hewlett-Packard
VAC
Volts alternating current
Hz
Hertz
VDC
Volts direct current
ICO
Intermediate Control Office
VF
Voice frequency
IDF
Intermediate Distribution Frame
VFCT
Voice frequency carrier telegraph
INT
Interbay
VFTC
Voice frequency telegraph circuit
INT P&T
Intermediate Patch and Test Bay
VM
KV
Kilovolts
VTVM
Vacuum tube voltmeter
KVA
Kilovolt-amperes
XMIT
Transmit
B-1

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