Glossary of Acronyms

The table below lists all acronyms defined in ATSC 1.0 Standards. The “Source” column refers to the document in which the acronym is defined.

Entry	Source	Definition
[X]	153	the greatest integer less than or equal to X
16QAM	80	16 (level) quadrature amplitude modulation
16-VSB	53, 54	vestigial sideband modulation with 16 discrete amplitude levels.
1CBPS	80	1 coded bit per symbol
2CBPS	80	2 coded bits per symbol
8PSK	80	8 (level) phase shift keying
8-VSB	53, 54	vestigial sideband modulation with 8 discrete amplitude levels.
A/D	53, 54	analog to digital converter
AAC	153	Advanced Audio Coding
ABA TDES	70	112 bit triple DES used in “encrypt-decrypt-encrypt” mode
ABC TDES	70	168 bit triple DES used in “encrypt-decrypt-encrypt” mode
AC-3	79, 83	ATSC Digital Audio Compression Standard (see A/52)
ACAP	101, 102	Advanced Common Application Platform
ACAP-J	101	ACAP Procedural (Java)
ACAP-X	101	ACAP Declarative (XHTML)
ACATS	53, 54	Advisory Committee on Advanced Television Service
ACIR	82	adjacent channel interference ratio
ACLR	82	adjacent channel leakage ratio
acmod	52	audio coding mode
ACRR	82	adjacent channel rejection ratio
addbsi	52	additional bit stream information
addbsie	52	additional bit stream information exists
addbsil	52	additional bit stream information length
AEIT	81	aggregate event information table
AES	53, 54	Audio Engineering Society
AES	153	Advanced Encryption Standard (AES may also refer to the Audio Engineering Society)
AETT	81	aggregate extended text table
AFI	95	authority and format identifier
AFD	54, 79	active format description.
ALC	153	Asynchronous Layered Coding
AMOL	79	automated measurement of lineups
ANSI	53, 54, 79	American National Standards Institute
API	100	application programming interface
ARM	96, 100	application reference model
ASCII	80	American Standard Code for Information Interchange
ASI	79	asynchronous serial interface
ASTD	81	ancillary service target decoder
AT	153	ATSC time
ATC	82	ancillary terrestrial component (MSS terrestrial base stations)
ATM	53, 54	asynchronous transfer mode
ATPC	82	automatic transmitter power control
ATSC	70, 65, 69, 71, 79, 80, 81, 82, 85, 90, 91, 92, 95, 96, 98, 99, 110, 153	Advanced Television Systems Committee
ATSC-M/H	153	ATSC Mobile/Handheld Standard
ATTC	54	Advanced Television Test Center
ATV	53, 54	advanced television
ATVEF	91	Advanced Television Enhancement Forum
audblk	52	audio block
audprodi2e	52	audio production information exists, ch2
audprodie	52	audio production information exists
auxbits	52	auxiliary data bits
auxdata	52	auxiliary data field
auxdatae	52	auxiliary data exists
auxdatal	52	auxiliary data length
AVC	153	Advanced Video Coding (ITU-T H.264 \| ISO/IEC 14496-10)
AWGN	54, 80	additive white Gaussian noise
B	153	SCCC output block length in symbols
baie	52	bit allocation information exists
bap	52	bit allocation pointer
BAS	82	Broadcast Auxiliary Services (Part 74 of the FCC Rules)
BCRO	153	broadcast rights object
BER	80, 82	bit error ratio
BFO	82	brute force overload
BFSK	82	binary phase-shift keying
bin	52	frequency coefficient bin in index [bin]
BIOP	95	broadcast inter-ORB protocol
blk	52	block in array index [blk]
blksw	52	block switch flag
BMP	65, 69	basic multilingual plane
bnd	52	band in array index [bnd]
bps	53, 54, 90	bits per second
bpsk	81	binary phase shift keying
BSD/A	153	Broadcast Service Distribution/Adaptation Center
bsi	52	bit stream information
bsid	52	bit stream identification
bslbf	57, 65, 69, 70, 81, 90, 92, 93, 94, 95, 97, 98, 100, 110, 153	bit serial, leftmost bit first (From A/57A: “Bit string, left bit first, where “left” is the order in which the bit strings are written in the Standard. Bits strings are written as strings of 1s and 0s within single quotation marks, e.g. ‘1000 1001’. Blanks within a bit string are for ease of reading and have no significance.”
BSM	153	BCAST subscription management
bsmod	52	bit stream mode
BSS	82, 110	buried spread spectrum (direct sequence)
BTSC	79	Broadcast Television Systems Committee
BWS	80	slot bandwidth (for a given service, within a transponder)
BWT	80	transponder bandwidth
C/I	110	signal-to-interference ratio (between transmitters within a network)
C/N	82	carrier to noise
CA	70, 81	conditional access
CAM	70	conditional access module
CAT	65, 69, 70, 81, 94, 98	conditional access table
CBC	70, 96	cipher block chaining
CDTV	54	conventional definition television
CEA	69, 79	Consumer Electronics Association
CDP	79	caption distribution packet
ch	52	channel in array index [ch]
chbwcod	52	channel bandwidth code
chexpstr	52	channel exponent strategy
chincpl	52	channel in coupling
chmant	52	channel mantissas
CIT-MH	153	ell information table for ATSC-M/H
clev	52	center mixing level coefficient
CM	79	component missing (see A/78)
cmixlev	52	center mix level
CMRS	82	commercial mobile radio services (cellular, SMR and PCS)
COFDM	82	coded orthogonal frequency division multiplexing
compr	52, 79	compression gain word
compr2	52	compression gain word, ch2
compr2e	52	compression gain word exists, ch2
compre	52	compression gain word exists
copyrightb	52	copyright bit
cplabsexp	52	coupling absolute exponent
cplbegf	52	coupling begin frequency code
cplbndstrc	52	coupling band structure
cplco	52	coupling coordinate
cplcoe	52	coupling coordinates exist
cplcoexp	52	coupling coordinate exponent
cplcomant	52	coupling coordinate mantissa
cpldeltba	52	coupling dba
cpldeltbae	52	coupling dba exists
cpldeltlen	52	coupling dba length
cpldeltnseg	52	coupling dba number of segments
cpldeltoffst	52	coupling dba offset
cplendf	52	coupling end frequency code
cplexps	52	coupling exponents
cplexpstr	52	coupling exponent strategy
cplfgaincod	52	coupling fast gain code
cplfleak	52	coupling fast leak initialization
cplfsnroffst	52	coupling fine SNR offset
cplinu	52	coupling in use
cplleake	52	coupling leak initialization exists
cplmant	52	coupling mantissas
cplsleak	52	coupling slow leak initialization
cplstre	52	coupling strategy exists
CRC	53, 54,65, 69, 81, 82, 90, 91, 92, 93, 95, 98, 153	cyclic redundancy check
crc1	52	crc – cyclic redundancy check word 1
crc2	52	crc – cyclic redundancy check word 2
crcrsv	52	crc reserved bit
CRL	96	certificate revocation list
CS	110	cadence signal
csnroffst	52	coarse SNR offset
CSS	100	Cascading Style Sheet
CTA	153	clear-to-air
CVCT	65, 69, 71, 81, 90, 94	cable virtual channel table
CW	70	control word (The key used for MPEG transport scrambling).
D/U	54, 110	desired (signal) to undesired (signal) ratio
d15	52	d15 exponent coding mode
d25	52	d25 exponent coding mode
d45	52	d45 exponent coding mode
DA	100	declarative application
DAE	100	Declarative Application Environment
DASE	96, 100	DTV Applications Software Environment
DAU	90, 91, 93, 95	data access unit
DAVIC	91, 100	Digital Audio Visual Council
dB	85	decibel
dB FS	85	decibels, relative to full scale sine wave (per AES17)
dB TP	85	decibels, true-peak relative to full-scale (per ITU-R BS.1770 Annex 2)
dba	52	delta bit allocation
dbpbcod	52	dB per bit code
DBFS	79	deciBels full scale
DBS	79	direct broadcast satellite
DC	91	DownloadCancel
DCC	57, 65, 69, 94	directed channel change
DCCRR	65	DCC capable DTV reference receiver
DCCSCT	65, 69	DCC selection code table
DCT	53, 54	discrete cosine transform
DDB	91, 95	DownloadDataBlock
DDE	92	declarative data essence
DEB	92, 93	data program element buffer
DEBn	90, 91	data elementary stream buffer for synchronized data elementary stream n
DEBSn	90	data elementary stream buffer size for synchronized data elementary stream n
deltba	52	channel dba
deltbae	52	channel dba exists
deltbaie	52	dba information exists
deltlen	52	channel dba length
deltnseg	52	channel dba number of segments
deltoffst	52	channel dba offset
DENG	82	digital electronic news gathering
DES	70	Data Encryption Standard
DES	70, 90, 93, 96	data elementary stream
DET	69, 81, 90, 91, 92, 93, 94	data event table
DFS	110	data field synchronization data segment
DH	96	Diffie-Hellman
DHCP	96	dynamic host configuration protocol
dialnorm	52	dialogue normalization word
dialnorm2	52	dialogue normalization word, ch2
DII	91, 94, 95	DownloadInfoIndication
DIMS	153	dynamic interactive multimedia scenes
DIT	69	data information table
dithflag	52	dither flag
DLNA	71	Digital Living Network Alliance
DNS	96, 153	domain name services
DOCSIS	96	Data Over Cable Service Interface Specification
DOM	100	document object model
DRC	79, 85	dynamic range control
DRL	82	data return link
DRM	153	digital rights management
DS	110	delay spread
DSI	91, 94, 95	DownloadServerInitiate
DSL	96	digital subscriber line
DSM	54	digital storage media
DSM-CC	54, 81, 90, 91, 92, 93, 94, 95, 96	digital storage media command and control
DSNG	80	digital satellite news gathering
DSS	54	data segment synchronization
DST	90, 81, 91, 93, 94, 95	data service table
dsurmod	52	Dolby surround mode
DTD	100	document type definition
DTH	80	direct to home
DTS	53, 54, 81, 90, 92	decoding time stamp
DTV	65, 69, 70, 79, 80, 90, 91, 96, 100, 110	digital television
DTVCC	94	digital television closed captioning
DTx	110	distributed transmission
DTxA	110, 153	distributed transmission adapter
DTxN	110, 153	distributed transmission network
DTxP	110	distributed transmission packet
DTxR	110	distributed translator
DTxS	110	distributed transmission system
DTxT	110	distributed transmitter
DVB	69, 70, 79, 80, 81, 90, 153	Digital Video Broadcasting
DVB-SI	80	Digital Video Broadcasting—Service Information
DVCR	54	digital video cassette recorder
DVS	69, 81	Digital Video Subcommittee
dynrng	52, 79	dynamic range gain word
dynrng2	52	dynamic range gain word, ch2
dynrng2e	52	dynamic range gain word exists, ch2
dynrnge	52	dynamic range gain word exists
EA	81	emergency alert
EBU	80, 94	European Broadcasting Union
ECB	70	electronic codebook (DES cipher mode)
ECC	110	error correcting code
ECM	54, 70, 81	entitlement control message
EDE	70, 96	encrypt-decrypt-encrypt
EIA	69, 94	Electronic Industries Alliance
EIRP	82	equivalent isotropic radiated power
EIT	65, 69, 70, 79, 81, 90, 91, 92, 93	event information table
EMM	54, 65, 69, 70, 98	entitlement management message
ENG	82	electronic news gathering (in the context of this document, “ENG” includes electronic field production
ENG-RO	82	ENG receive-only site (also known as “central” receive site)
EPG	65, 69, 76, 91, 94	electronic program guide
ERP	110	effective radiated power
ES	53, 54, 81, 90, 91, 93	elementary stream
ESCR	53, 54, 91	elementary stream clock reference
ESG	153	electronic service guide
ETM	65, 69, 81, 90, 92	extended text message
ETS	80	European Telecommunication Standard
ETSI	79	European Telecommunications Standards Institute
ETT	65, 69, 81, 90, 92, 94	extended text table
exps	52	channel exponents
fbw	52	full bandwidth
fdcycod	52	fast decay code
FCC	79	Federal Communications Commission
FDM	80	frequency division multiplex
FDMA	80	frequency division multiple access
FDT	153	file delivery table
FEC	53, 80, 82, 153	forward error correction
FET-MH	153	future event table for ATSC-M/H
fgaincod	52	channel fast gain code
FIC	153	fast information channel
FIFO	80	first-in, first-out shift register
FIR	80	finite impulse response
floorcod	52	masking floor code
floortab	52	masking floor table
FLUTE	153	File Delivery over Unidirectional Transport (RFC 3926)
FM	79	frequency modulation
FPLL	54	frequency and phase-locked-loop
FRAGnkj	92	IP fragmentation buffer for fragment identifier j, multicast address k, in program element n
frmsizecod	52	frame size code
fscod	52	sampling frequency code
FSK	82	frequency-shift keying
fsnroffst	52	channel fine SNR offset
FSPL	82	free-space power loss
FTA	153	free-to-air
gainrng	52	channel gain range code
GAT	153	guide access table
GAT-MH	153	guide access table for ATSC-M/H
GF	153	Galois field
GHz	80	gigahertz (109 cycles per second)
GMSK	82	Guassian minimum shift keying
GOP	53, 54	group of pictures
GPI	85	general purpose interface
GPS	65, 69, 76, 81, 110, 153	Global Positioning System
grp	52	group in index [grp]
HANC	79	horizontal ancillary
HAVi	100	Home Audio Video Interoperability
HD	79	high-definition
HD-SD	79	high definition serial digital interface (compliant with SMPTE 292)
HDTV	53, 54, 79, 80	high-definition television
HE AAC	153	High Efficiency Advanced Audio Coding
HE AAC v2	153	High Efficiency Advanced Audio Coding version 2
HEX	80	hexadecimal notation
HPA	80	high power amplifier
HTML	70, 90, 100	Hypertext Markup Language
HTTP	96, 153	Hyper Text Transfer Protocol
HTTPS	96	Hyper Text Transfer Protocol – Secure
I/O	80	input/output
IBO	80	input back off
ICMP	96	Internet Control Message Protocol
ICP	96	interaction channel provider
ICSP	96	interactive content service provider
ID	153	identification
IDL	100	Interface Definition Language
IDR	80	intermediate data rate
IEC	53, 54, 69, 71, 80, 81, 90, 94	International Electrotechnical Commission
IEEE	71, 90, 96	Institute of Electrical and Electronics Engineers
IESS	80	Intelsat Earth Station Standard
IETF	91, 92, 94, 96, 153	Internet Engineering Task Force
IF	80	intermediate frequency
IOR	95	interoperable object reference
IP	91, 92, 94, 96, 100, 153	Internet Protocol
IPG	69	interactive program guide
IPGRMBnk	92	IP datagram buffer for kth IP multicast address in the nth program element
IPM	92, 96	IP multicast
IPsec	153	IP security
IPTV	71, 79	Internet Protocol television
IPX	91	internetwork packet exchange
IRD	79	integrated receiver/decoder (sometimes termed receiver/descrambler, but not in these systems. ATSC content is always in the “clear”).
ISAN	57, 76, 153	International Standard Audiovisual Number
ISDN	96	Integrated Services Digital Network
ISI	54	intersymbol interference
ISO	53, 54, 69, 71, 80, 81, 90, 91, 94, 96, 99	International Organization for Standardization
ISP	96	Internet service provider
ITU	53, 54, 79, 85, 90, 92, 94, 96	International Telecommunication Union
ITV	96	interactive television
IV	70	initialization vector
JDK	100	Java Development Kit
JEC	54	Joint Engineering Committee (of EIA and NCTA)
JMF	100	Java Media Framework
JPEG	100	Joint Photographic Expert Group
kbps	69, 90, 95	1,000 bits per second
LAN	96	local area network
langcod	52	language code
langcod2	52	language code, ch2
langcod2e	52	language code exists, ch2
langcode	52	language code exists
LASeR	153	lightweight application scene representation
LCT	153	layered coding transport
lfe	52	low frequency effects
lfeexps	52	lfe exponents
lfeexpstr	52	lfe exponent strategy
lfefgaincod	52	lfe fast gain code
lfefsnroffst	52	lfe fine SNR offset
lfemant	52	lfe mantissas
lfeon	52	lfe on
LKFS	85	loudness, K-weighted, relative to full scale, measured with equipment that implements the algorithm specified by ITU-R BS.1770; a unit of LKFS is equivalent to a decibel
LLC-SNAP	90, 91	Logical Link Control – Sub Network Access Protocol
LMS	54	least mean squares
LNA	80	low-noise amplifier
LNB	80	low-noise block downconverter
LOS	82	line of sight
LQ	82	link quality
LSB	91, 110	least significant byte
LTKM	153	long-term key message
LTST	91, 94	long term service table
M/H	153	mobile/pedestrian/handheld
MAC	90, 92	media access control
mbps	53, 54, 80, 90, 95, 110	1,000,000 bits per second
MCPC	80	multiple channels per carrier
MD	110	maximum delay
MD5	96	message digest 5
MER	82	modulation error ratio
MGT	65, 69, 70, 81, 90, 91	master guide table
MHE	153	M/H encapsulation
MHz	69, 80	megahertz (106 cycles per second)
MIME	94, 100	Multipurpose Internet Mail Extensions
MIP	96	minimal implementation profile
mixlevel	52	mixing level
mixlevel2	52	mixing level, ch2
MMI	70	man-machine interface
MNG	100	multiple network graphics
MP@HL	53, 54	Main Profile at High Level
MP@ML	53, 54	Main Profile at Main Level
MPAA	65, 69	Motion Picture Association of America
MPE	92	multi-protocol encapsulation
MPEG	53, 54, 65, 69, 70, 71, 79, 80, 81, 90, 91, 92, 93, 94, 95, 96, 99, 110, 153	Moving Picture Experts Group; refers to standards developed by the ISO/IEC JTC1/SC29 WG11
MPEG-1	53, 54, 95	Refers to ISO/IEC standards 11172-1 (Systems), 11172-2 (Video), 11172-3 (Audio), 11172-4 (Compliance Testing), and 11172-5 (Technical Report)
MPEG-2	53, 54, 95	MPEG-2 – Refers to ISO/IEC standards 13818-1 (systems), 13818-2 (video), 13818-3 (Audio), 13818-4 (Compliance).
MRD	81, 93	MPEG-2 registration descriptor
MS	92	media stream
MSB	80, 110	most significant bit
MSK	82	minimum shift keying
MSS	82	mobile satellite service
mstrcplco	52	master coupling coordinate
MTU	90, 91, 92	maximum transmission unit
MUX	53, 80	multiplex
MVPD	79, 85	multichannel video programming distributor
MWCS	82	Miscellaneous Wireless Communications Services
N	153	number of columns in RS Frame payload
nauxbits	52	number of auxiliary bits
nbomsbf	90, 92	network byte order, most significant bit first
nchans	52	number of channels
nchgrps	52	number of fbw channel exponent groups
nchmant	52	number of fbw channel mantissas
ncplbnd	52	number of structured coupled bands
ncplgrps	52	number of coupled exponent groups
ncplmant	52	number of coupled mantissas
ncplsubnd	52	number of coupling sub-bands
nfchans	52	number of fbw channels
NIC	96	network interface card
nlfegrps	52	number of lfe channel exponent groups
nlfemant	52	number of lfe channel mantissas
NoG	153	number of M/H groups per M/H subframe
NRSS	70	National Renewable Security Standard
NRT	90, 91, 92, 94, 95	network resources table
NSAP	95	network service access point
NTP	92, 96, 153	network time protocol
NTSC	69, 79	National Television Systems Committee
NVOD	65, 69, 100	near video on demand
OBO	80	output back off
OCSP	96	On-Line Certificate Status Protocol
OCT	80	octal notation
OD	110	offset delay
OMA	153	Open Mobile Alliance
OMA-BCAST	153	Open Mobile Alliance Broadcast
OMP	110	operations and maintenance packet
OOB	65, 69	out of band
OOBE	82	out of band emissions (spurious signals)
OQPSK	81, 82	offset quadrature phase shift keying
ORB	95	object request broker
origbs	52	original bit stream
OSI	96	Open System Interconnection
OUI	90, 94, 95, 97	organization unique identifier
P	80	puncturing
P	153	number of RS parity bytes per RS frame column
PA	100	procedural application
PAE	100	Procedural Application Environment
PAT	65, 69, 80, 81, 90, 91, 92, 94, 110	program association table
PAT-E	53	A table with the same syntax as Program Association Table as defined by ISO/IEC 13818-1 transmitted using an enhanced VSB mode defined in A/53- Part 2.
PCCC	153	parallel concatenated convolutional code
PCR	53, 54, 65, 69, 70, 90, 91, 110	program clock reference
PCS	82	personal communications services
PCM	79	pulse code modulation
PDU	92	protocol data unit
PEK	153	program encryption key
pel	53, 54	pixel
PES	53, 54, 65, 69, 70, 81, 90, 91, 92, 93	packetized elementary stream
phsflg	52	phase flag
phsflginu	52	phase flags in use
PID	53, 54, 65, 69, 70, 76, 79, 81, 90, 91, 92, 93, 94, 98, 110	packet identifier
PIRD	79	professional integrated receiver/decoder (see IRD)
PKI	96	public key infrastructure
PL	153	RS frame portion length
PMT	53, 57, 65, 69, 70, 80, 81, 90, 91, 93, 94, 95	program map table
PMT-E	53	A table with the same syntax as Program Map Table as defined by ISO/IEC 13818-1 transmitted using an enhanced VSB mode defined in A/53 Part 2.
PMT-E_PID	53	A PID that identifies the Transport Stream packets that carry TS_program_map_section()s in a TS-E.
PNG	100	Portable Network Graphics
POA	79	program off sir (see A/78)
POD	97	point of deployment
POTS	96	plain old telephone service
ppm	82, 110	parts per million
PPM	85	peak program meter
PRC	153	parade repetition cycle
PRBS	80, 110	pseudo random binary sequence
PS	153	parametric stereo
PSI	53, 54, 69, 70, 81, 90	program specific information
PSIP	54, 65, 69, 70, 79, 81, 90, 91, 92, 93, 94, 95, 96	Program and System Information Protocol; a collection of tables describing virtual channel attributes, event features, and other information.
PSK	80, 82	phase shift keying
PTC	65, 69	physical transmission channel
PTS	53, 54, 81, 90, 91, 100	presentation time stamp
PU	53, 54, 90	presentation unit
QEF	80	quasi-error-free
QPSK	80, 81, 82	quadrature phase shift keying
QUAM	69, 79, 81	quadrature amplitude modulation
R	153	the number of FIC chunks per M/H frame
rbnd	52	rematrix band in index [rbnd]
RCE	100	runtime code extension
RCL	82	receive carrier level
RCU	69	remote control unit
rematflg	52	rematrix flag
rematstr	52	rematrixing strategy
RF	79, 80, 82, 110	radio frequency
RFC	91, 92, 94, 96	request for comment
RFI	80	request for information
RI	153	rights issuer
riuimsbf	110	repeated, inverted, unsigned integer, most significant bit first
riuimsbfwp	110	repeated, inverted, unsigned integer, most significant bit first, with parity
RME	153	rich media environment
RO	153	right object
ROM	54	read-only memory
roomtyp	52	room type
roomtyp2	52	room type, ch2
ROT	153	root of trust
RP	79	recommended practice
rpchof	57, 65, 69, 81, 82, 90, 98	remainder polynomial coefficients, highest order first
RRT	65, 69, 81, 90	rating region table
RRT-MH	153	rating region table for ATSC-M/H
RS	53, 80, 110, 153	Reed-Solomon
RSA	96	Rivest, Shamir, Aldeman
RTP	153	real-time transport protocol
RTT	69	ratings text table
S	153	number of padding bytes
S/N	82	signal to noise ratio
SAP	92	session announcement protocol
SAP	79	secondary audio program
SBn	91, 92, 94	smoothing buffer
sbnd	52	sub-band in index [sbnd]
SBR	153	spectral band replication
SCB1…SCB10	153	SCCC (serial concatenated convolutional coding) blocks number 1 through number 10
SCCC	153	serial concatenated convolutional code
SCM	82	single carrier modulation)
SCPC	80	single channel per carrier
SCR	53, 54	system clock reference
SCTE	65, 69, 70, 79, 81, 90, 92, 96	Society of Cable Telecommunications Engineers
SD	69, 79	standard definition
sdcycod	52	slow decay code
SDF	91, 94	service description framework
SDI	79	serial digital interface (compliant with SMPTE 259M)
SDO	97	standards development organization
SDP	92, 153	session description protocol
SDT	90,92	service description table
SDTV	53, 54, 69, 79	standard definition television
SEK	153	service encryption key
seg	52	segment in index [seg]
SFN	110	single frequency network
sgaincod	52	slow gain code
SG	153	(electronic) service guide
SGN	153	starting group number
SHA-1	96	Secure Hash Standard 1
SI	65, 90	system information
SI	69, 80, 81	service information
SIBL	153	SCCC input block length in bytes
signed int	153	signed integer
simsbf	82	signed integer, most significant bit first
skipfld	52	skip field
skipl	52	skip length
skiple	52	skip length exists
SLD	91,92, 94	service location descriptor
slev	52	surround mixing level coefficient
SLT-MH	153	service labeling table for ATSC-M/H
SMPTE	53, 54, 69, 79, 92, 94	Society of Motion Picture and Television Engineers
SMR	82	specialized mobile radio
SMT-MH	153	service map table for ATSC-M/H
SNG	80	satellite news gathering
snroffste	52	SNR offset exists
SOBL	153	SCCC output block length in bytes
SP	110	synchronization packet
SPL	85	sound pressure level in decibels referenced to 20 µN/m2
SRM		system renewability message
SRTP	153	Secure Real Time Protocol
SSL	96	secure socket layer
STB	79, 96	set-top box
STC	54, 100	system time clock
STD	53, 54, 65, 69, 81, 90, 94	system target decoder
STKM	153	short-term key message
STL	112	studio-to-transmitter link
STS	110	synchronization time stamp
STT	65, 69, 81, 90	system time table
STT-MH	153	system time table for ATSC-M/H
surmixlev	52	surround mix level
SVC	153	Scalable Video Coding (Annex G of ITU-T rec. H.264 \| ISO/IEC 14496-10)
SVG	153	Scalable Vector Graphics
syncframe	52	synchronization frame
syncinfo	52	synchronization information
syncword	52	synchronization word
TAD	110	transmitter and antenna delay
TBD	80	to be determined
TBn	90, 91	transport buffer for data elementary stream n
TBSn	90, 92	transport buffer size for data elementary stream n
tcimsbf	110	two’s complement integer, most significant bit first
TCM	80	trellis coded modulation
TCP	96, 153	Transmission Control Protocol
TCP/IP	76, 90	Transport Control Protocol/Internet Protocol
TDAC	52	time division aliasing cancellation
TDES	70	triple DES
TDM	80	time division multiplex
TEK	153	taffic encryption key
timecod1	52	time code first half
timecod1e	52	time code first half exists
timecod2	52	time code second half
timecod2e	52	time code second half exists
TLS	96	transport layer security
TNC	79	technically non-conformant (see A/78)
TNoG	153	total number of M/H groups including all the M/H groups belonging to all M/H parades in one M/H subframe
TOA	79	transport-stream off-air (see A/78)
TOV	54	threshold of visibility
TPC	153	transmission parameter channel
TPO	82	transmitter power output
TS	65, 69, 70, 79, 81, 90, 91, 92, 93, 95, 98, 110, 112, 153	transport stream
TS-M	53, 153	The portion of TS-R that contains only all Transport Stream packets transmitted by the main mode (see A/53- Part 2.
TS-R	53	The recombined Transport Stream containing all Transport Stream packets delivered by all transmission modes (main, one-half rate and one-quarter rate) (see A/53- Part 2.
TS-E	53	The portion of TS-R that contains only all Transport Stream packets transmitted by one-half rate and/or one-quarter rate modes(see A/53- Part 2).
TS-Ea	53	The portion of TS-E that contains only all Transport Stream packets transmitted by one-half rate mode (see A/53- Part 2).
TS-Eb	53	The portion of TS-E that contains only all Transport Stream packets transmitted by one-quarter rate mode (see A/53- Part 2)
TSDT	80, 81	transport stream descriptor table
TSFS	94, 95, 96	transport stream file system
TSI	153	transport session identifier
TSID	57,69, 69, 95	transport stream identifier (digital) or transmission signal identifier (analog)
TTL	92	time to live
TV	80	television
TV BAS	82	Television Broadcast Auxiliary Service rules (Part 74, subpart f, of the FCC Rules)
TVCT	65, 69, 71, 81, 90, 94	terrestrial virtual channel table
TVPG	69	television parental guidelines
TWTA	80	traveling wave tube amplifier
TxID	82	transmitter identification signal
UDP	92, 96, 153	User Datagram Protocol
UDPnkji	92	UDP buffer for port I, fragment identifier j, IP multicast address k, in program element n
uilsBf	100	unsigned integer least significant byte first
uilsWBf	100	unsigned integer least significant word and byte first
uimsbf	57, 65, 69, 70, 80, 81, 82, 90, 92, 93, 94, 95, 97, 98, 100, 110, 153	unsigned integer, most significant bit first
uipfmsbf	110	unsigned integer plus fraction, most significant bit first
U-N	91	user to network
UMID	57	universal material identifier
unicode	65, 69, 70	Unicode™
URI	94, 95, 96, 100	uniform resource identifier
URL	69	uniform resource locator
UTC	65, 69, 76, 81, 90	Coordinated Universal Time
U-U	95	user-to-user
UUID	94, 100	universal unique identifier
VANC	79, 99	vertical ancillary
VBI	69, 79, 99	vertical blanking interval
VBS	79	vestigial sideband
VBV	53, 54, 81	video buffering verifier
VC	69	virtual channel
VCT	65, 69, 70, 71, 90, 91, 93, 94	virtual channel table
V-ISAN	57, 76	Version of an International Standard Audiovisual Number
VSB	53, 69	vestigial sideband
VU	85	volume unit
W3C	100, 153	World Wide Web Consortium
WAN	96	wide area network
WM	110	watermark
XDML	100	Extensible DTV Markup Language
XDS	79	extended data services
XML	76, 100	Extensible Markup Language
XOR	110	exclusive OR function

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The Advanced Television Systems Committee, Inc., is an international, non-profit organization developing voluntary standards and recommended practices for digital terrestrial broadcasting. ATSC member organizations represent the broadcast, broadcast equipment, motion picture, consumer electronics, computer, cable, satellite, and semiconductor industries. ATSC also develops digital terrestrial broadcasting implementation strategies and supports educational activities on ATSC standards.

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