646
ACRONYMS AND ABBREVIATIONS
SLR
send loudness rating
SMDS
switched multimegabit data service
SMPTE
Society of Motion Picture and Television Engineers
SMT
station management
SN
sequence number
S/N, SNR
signal-to-noise ratio
SNA
system network architecture
SNAP
subnetwork access protocol
SNP
sequence number protection
SOH
section overhead; start of heading
SONET
synchronous optical network
SP
signaling point
SPC
stored program control
SPE
synchronous payload envelope
SREJ
selective reject
SRTS
synchronous residual time stamp
SSAP
source service access point
SSB, SSBSC
single sideband, single sideband suppressed carrier
SSM
single segment message
ST
segment type
STL
studio-to-transmitter link; Standard Telephone Laboratory
STM
synchronous transport module; synchronous transfer mode
STP
shielded twisted pair
STS
synchronous transport signal; spacetimespace (switch)
SVC
switched virtual circuit
SXS
step-by-step (switch)
TA
terminal adapter
TASO
Television Allocation Study Organization
TAT
trans-atlantic (cable)
TBD
to be determined
TC
transmission convergence
TCP/IP
transmission control protocol/Internet protocol
TDD
time division duplex
TDM
time division multiplex
TDMA
time division multiple access
TE
terminal equipment
TelCo
telephone company
T&G
trees & growth
THT
token holding timer
THz
terahertz
(1 × 10
12
Hz
)
TIA
Telecommunication Industry Association
TLP
test level point
TPDU
transport protocol data unit
TRE
transmit reference equivalent
TRT
token rotation timer
TS
time slot
TSI
time slot interchanger
TSTS
time space time space (switching)
TU
tributary unit