ACRONYMS AND ABBREVIATIONS
645
PVC
permanent virtual circuit
pW
picowatt(s)
pWp
picowatt(s) psophometrically weighted
QAM
quadrature amplitude modulation
QoS
quality of service
QPSK
quadrature phase shift keying
RARP
reverse address resolution protocol
RBOC
Regional Bell Operating Company
RC
resistance capacitance (time constant)
RD
resistance design
RE
reference equivalent
RELP
residual excited linear predictive (coder)
RF
radio frequency
RFI
radio frequency interference
RI
route identifier
RL
return loss
RLR
receive loudness rating
rms
root mean square
RNR
receive not ready
RR
receive ready
RRD
revised resistance design
RRE
receive reference equivalent
RS
ReedSolomon (code); reconciliation sublayer
RSL
receive signal level
RSU
remote subscriber unit
RT
remote terminal
RZ
return to zero
SA
source address
SANC
signaling area/network code
SAP
service access point
SAPI
service access point identifier
SAR
segmentation and reassembly
SBC
sub-band coding
SBS
selective broadcast signaling
SCADA
supervisory control and data acquisition
SCCP
signaling connection control part
SCPC
signal channel per carrier
S/D
signal-to-distortion ratio
SDH
synchronous digital hierarchy
SDLC
synchronous data link control
SDT
structured data transfer
SDU
service data unit
SECAM
sequential color and memory
SF
signal frequency (signaling)
SFD
start of frame delimiter
SINAD
signal
+ noise + distortion-to-noise + distortion ratio
SLC
signaling link code
SLIC
subscriber line interface card
SLP
single link procedure