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Glossary September 25, 2006
GL-2 LTPE-UM-3159-02
K
kbps – kilobytes per second
km – kilometers
L
LED – Light Emitting Diode
LL – Local Loopback
LDC – Loss of Data Port (Nx64k) Clock
LEC – Loss of External Clock
LOC – Loss of Clock
LOSW – Loss of Sync Word
LPBK – Loopback
LTU – Line Termination Unit
M
M34F – M-type 34-pin Female Connector
MAR – Margin
Mbps – Megabits per second
MHz – Megahertz
mm – millimeter
N
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.
O
Op – Operation
PFO – Power Feed Open
PFS – Power Feed Short
ppm – pulse per minute
PRBS – Pseudorandom Bit Sequence
R
RAM – Random Access Memory
REM – Remote
RL – Remote Loopback
RLSD – Received Line Signal Detector
RTS – Ready to Send
S
SD – Transmit Data
SLIP – Serial Line Internet Protocol
ST – Send Timing
STU-C – SHDSL Terminating Unit for the CO
STU-R – SHDSL Terminating Unit for the RT
S/W – Software