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Abbreviations
A
BBREVIATIONS
AIS
Alarm Indication Signal
ALM
Alarm
ANSI
American National Standards Institute
AWG
American Wire Gage
BER
Bit Error Rate
C
Centigrade
COM
Communication
CRC
Cyclic Redundancy Check
CTS
Clear To Send
D15F
D-type 15-pin Female Connector
D25F
D-type 25-pin Female Connector
D9F
D-type 9-pin Female Connector
dB
Decibel
DCE
Data Communications Equipment
Det
Detector
dnl
Download
DS0
Digital Service, Level 0 (64 kbps)
DSR
Data Set Ready
DTE
Data Terminal Equipment
DTR
Data Terminal Ready
EMC
Electromagnetic Compliance
EMI
Electromagnetic Interference
EMS
Exchange Office Management Shelf
EMU
Exchange Office Management Unit
ES
Errored Second
ETR
ETSI Technical Report
ETSI
European Telecommunications Standards
Institute
ETU
ETSI Termination Unit
EXT
External
H/W
Hardware
HDSL
High-bit-rate Digital Subscriber Line
Hz
Hertz
I/F
Interface
ID
Identification
INT
Internal
kbps
kilobytes per second
km
kilometers
LED
Light Emitting Diode
70
LL
Local Loopback
LOC
Local
LOC
Loss of Clock
LOSW
Loss of Sync Word
LPBK
Loopback
LTU
Line Termination Unit
M34F
M-type 34-pin Female Connector
MAR
Margin
Mbps
Megabits per second
MHz
Megahertz
mm
millimeter
NC
Normally Closed
NO
Normally Open
NTU
Network Termination Unit
NVRAM Non-volatile Random Access Memory
Nx64k
Number (N) of 64 kbps DS0 time slots
mapped to a data port.
Op
Operation
PFO
Power Feed Open
PFS
Power Feed Short
ppm
pulse per minute
PRBS
Pseudorandom Bit Sequence
RAM
Random Access Memory
REM
Remote
RL
Remote Loopback
RLSD
Received Line Signal Detector
RTS
Ready to Send
S/W
Software
SD
Transmit Data
ST
Send Timing
SYNC
Synchronization
TM
Test Mode
TT
Terminal Timing
UAS
Unavailable Seconds
UTU
Universal Termination Unit
V
Volts
Vdc
Volts direct current
VT100
A terminal-emulation system
W
Watts
August 9, 2002
700-701-100-02
UTU-701 and ETU-751 List 1
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