R-Z

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RADIUS	remote-access dial-in user service
RAID	redundant arrays of inexpensive disks
RAM	random-access memory
RAS	registration, admission and status
RBES	rule-based expert systems
RDBMS	relational database management system
RF	radio frequency
RFC	request for comment
RFI	radio frequency interference
RFI	request for information
RFP	request for proposal
RFQ	request for quotation
RIF	routing information field
RIP	Routing Information Protocol
RISC	reduced instruction set computing
RJE	remote job entry
RMON	remote monitoring
ROI	return on investment
ROM	read-only memory
RP	rendezvous point
RPC	remote procedure call
RPR	resilient packet ring
RSVP	resource ReSerVation Protocol
RTCP	Real-Time Control Protocol
RTL	remote terminal loopback
RTNR	real-time network routing (AT&T)
RTP	Rapid Transfer Protocol (IBM Corp.)
RTP	Real-Time Protocol
RTS	request to send
RX	receive
SA	source address
SAN	storage area network
SAR	segmentation and reassembly
SAS	single-attached station
SCNA	security certified network architect
SCSI	small computer systems interface
SD	start delimiter
SDH	synchronous digital hierarchy
SDK	software development kit
SDLC	synchronous data link control (IBM)
SDM	subrate data multiplexing
SDN	Software Defined Network (AT&T)
SEC	Securities & Exchange Commission
SF	superframe
SFD	start frame delimiter
SFT	system fault tolerance
SIG	special interest group
SIIA	Software & Information Industry Association (formerly, Software Publishers Association)
SIP	Session Initiation Protocol
SLA	service-level agreement
SLIP	Serial Line Internet Protocol
SMBIOS	system management basic input/output system
SMDI	simplified message desk interface
SMDR	station message detail recording
SMDS	switched multimegabit data services
SMI	storage management initiative
SMR	specialized mobile radio
SMS	short messaging service
SMS	systems management server (Microsoft)
SMT	Station Management
SMTP	Simple Mail Transfer Protocol
SNCP	storage networking certification program
SNIA	Storage Networking Industry Association
SNMP	Simple Network Management Protocol
SNA	systems network architecture
SoIP	Storage over Internet Protocol
SONET	synchronous optical network
SPA	Software Publishers Association
SPX	synchronous packet exchange (Novell, Inc.)
SQL	structured query language
SRTLB	source-route translation bridging
SS7	signaling system 7
SSA	serial storage architecture (IBM Corp.)
SSCP	systems security certified practitioner
SSCP	system services control point (IBM Corp.)
SSCP/PU	system services control point/physical unit (IBM Corp.)
SSID	service set identifier
SSL	secure sockets layer
SSP	storage service provider
STA	spanning tree algorithm
STC	serving test center
STDM	statistical time division multiplexing
STP	signal transfer point
STP	Spanning Tree Protocol
SVC	switched virtual circuit
SWC	serving wire center
T1	Transmission service at the DS1 rate of 1.544 Mbps
T3	transmission service at the DS3 rate of 44.736 Mbps
TC	topology change
TCA	topology change acknowledgement
TCN	topology change notification
TCO	total cost of ownership
TCP	Transmission Control Protocol
TDD	time division duplexing
TDM	time division multiplexer
TDMA	time division multiple access
TDR	time domain reflectometry
TIF	tag image-file format
TIMS	transmission impairment measurement sets
TKIP	Temporal Key Integrity Protocol
TMN	Telecommunications Management Network
TMS	transport management system
ToS	type of service
TPDDI	twisted-pair distributed data interface
TSANet	Technical Support Alliance Network
TSR	terminal stay resident
TTRT	target token rotation time
TTS	transaction tracking service
TX	transmit
UBR	unspecified bit rate
UDP	User Datagram Protocol
UDP/IP	User Datagram Protocol/Internet Protocol
U/L	upper/lower
UAS	user-agent server
UML	unified modeling language
UNE	unbundled network element
UNI	user-network interface
UPS	uninterruptible power supply
URI	uniform resource identifier
URL	universal resource locator
USB	universal serial bus
UTP	unshield twisted-pair
VAN	value-added network
VAR	value-added reseller
VBR	variable bit rate
VBR-nrt	variable bit rate – nonreal time
VBR-rt	variable bit rate – real time
VC	virtual circuit
VCI	virtual circuit identifier
VCR	video cassette recorder
VG	voice grade
VF	voice frequency
VLBRV	very low bit rate voice
VLSI	very large-scale integration
VMS	virtual machine system (Digital Equipment Corp.)
VOFDM	vector orthogonal frequency division multiplexing
VoFR	voice over frame relay
VoIP	voice over Internet Protocol
VP	virtual path
VPI	virtual path identifier
VPN	virtual private network
VSAT	very small aperture terminal
VT	virtual terminal
VT	virtual tributary
VTAM	virtual telecommunications access method (IBM Corp.)
WAN	wide area network
WATS	wide area telecommunication service
WBEM	Web-based enterprise management
WBT	Web-based training
WDM	wavelength division multiplexing
WEP	wired equivalent privacy
WFQ	weighted fair queuing
Wi-Fi	wireless fidelity
WLAN	wireless local area network
WPA	Wi-Fi protected access
WSF	workstation function
WWN	world wide name
WWW	World Wide Web
XID	exchange identifier
XNS	Xerox Network System (Xerox Corp.)
ZBTSI	zero byte time-slot interchange

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