KEY
IPv4 Version relevant to Internet Protocol V4
IPv6 Version relevant to Internet Protocol V4
MIB Document defines the Management information base (MIB) for the protocol, interface or other network element, usually according to the Structure of Management Information version 2 (SMIv2) MOs Document defines managed objects for the protocol, interface or other network element
V Version number
V1-V2 Covers compatibility issues between different versions of a given function or protocol
 
ABBREVIATION FULL FORM AND REFERENCES
U
U User option
ua Ukraine
UA Unnumbered Acknowledgement (HDLC, LLC)
UA User Agent
UAE User Agent Entity (X.400)
UAL User Adaptation Layer RFC 3057, ITU-T Q.921
UAL User Agent Layer (X.400)
UAP open User group Authorization Protocol (DHCP) RFC 2485
UART Universal Asynchronous Receiver/Transmitter
UAS UnAvailable Seconds
UB Reference point at the UNI on the network side of B-NT1
U-bit Unrecognised TLV type (MPLS) RFC 3032
UBR Unspecified Bit Rate (ATM)
UCLA University of California, Los Angeles
UCS Universal Multiple Octet (Unicode) Character Set ISO-10646
UCSB University of California, Santa Barbara
UDDI Universal Discovery, Description and Integration directory www.uddi.org
UDF User DeFined
UDLR UniDirectional Link Routing
UDP User Datagram Protocol RFC 0768, RFC 2013 (MIB), RFC 2147 (IPv6), RFC 2454 (MIB IPv6)
UdpMIB User Datagram Protocol MIB (mib-2) RFC 2013
UDT Unstructured Data Transferred
u-frame unnumbered frame (HDLC,LLC)
UFT Unsolicited File Transfer RFC 1440
ug Uganda
UI Unnumbered Information (LLC)
UIDL Unique IDentifier Listing (POP)
UIDPLUS Using IMAP4 to support Disconnected operation PLUS RFC 2359 U-interface 2 wires only ISDN BRI interface
uk United Kingdom
U/L Universal/Local identifier
um US minor outlying islands
UME UNI Management Entity
UMTS Universal Mobile Telephone Service
UNARP Unavailable station announcement update to ARP RFC 1868
UNI User-Network Interface Unicode a 16-bit universal code for alphanumeric character representation ISO 10646, www.unicode.org
uniq UNIQue
UNIX Universal Operating system for computers developed initially by AT\&T
UNRP User-to-Network Reference Points
UPC Usage Parameter Control (ATM)
UPF User Priority Field IEEE 802.1p
u-plane User plane (used for transferring user data) ITU-T I.321
UPS Uninterruptible Power Supply RFC 1628 (MIB)
UpsMIB Uninterruptible Power Supplies MIB (mib-2) RFC 1628
UPT Universal Personal Telecommunication
URA Uniform Resource Agent RFC 2016
URG URGent (TCP)
URI Uniform Resource Identifier RFC 1630, RFC 2168, RFC 2396, RFC 2483, RFC 2838, RFC 3305
URL Uniform Resource Locator RFC 1738, RFC 1808, RFC 1959-60, RFC 2056, RFC 2111, RFC 2368-9, RFC 2384, RFC 2392, RFC 2397, RFC 2806, RFC 3305
URN Uniform Resource Name RFC 2141, RFC 2169, RFC 2276, RFC 2483, RFC 2611, RFC 2648, RFC 3001, RFC 3061, RFC 3120-1, RFC 3187-8, RFC 3305
us United States
US Unit Separator (see ASCII)
US United States of America
USA United States of America
USART Universal Synchronous/Asynchronous Receiver/Transmitter
USB Universal Serial Bus
USENET USENET Newsgroup Organization RFC 1036
USER USERname (FTP)
USERS Active USERS RFC 0866
USF Uplink State Flag
USM User-based Security Model (SNMP v3) RFC 2264, RFC 2274, RFC 2574
USR1 USeR-defined signal 1 (POSIX)
USR2 USeR-defined signal 2 (POSIX)
UT Universal Time
UTC Coordinated Universal Time
UTF UCS Transformation Format (see also unicode) RFC 2044 (UTF8), RFC 2152 (UTF7), RFC 2279 (UTF8), RFC 2781 (UTF-16)
UTOPIA Universal Test and Operations Physical Interface for ATM (standard ATM/PHY layer interface)
UTP Unshielded Twisted Pair (cable) EIA/TIA 568
UUCP Unified User Control Protocol RFC 0976
UUCP UNIX-to-UNIX Copy Program
UULP Unified User Level Protocol RFC 0451, RFC 0666
UUP User-User Protocol RFC 0091
UUS User-to-User Signalling
uy Uruguay
uz Uzbekistan
V
V Version number
V Violation
V.10 ITU-T recommendation for physical layer DTE/DCE data interface ITU-T V.10
V.11 ITU-T recommendation for physical layer DTE/DCE data interface ITU-T V.11
V.24 ITU-T recommendation V.24 (DTE-to-DCE interface) ITU-T V.24
V.32 ITU-T recommendation for inter-modem modulation up to 9600 bit/s ITU-T V.32
V.34 ITU-T recommendation for inter-modem modulation up to 28 800 bit/s ITU-T V.34
V.35 ITU-T recommendation V.35 (highspeed DTE-to-DCE interface) ITU-T V.35
V.36 ITU-T recommendation V.36 (highspeed DTE-to-DCE interface) ITU-T V.36
V.90 ITU-T recommendation V.90 (high speed modem) ITU-T V.90
V+D Voice and Data
va Vatican state
VACM View-based Access Control Model (SNMPv3) RFC 2265, RFC 2275, RFC 2575
VAN Value Added Network
VANS Value Added Network Services
VarBind VARiable BINDing (SNMP)
VAS Value Added Service
VASP Value Added Service Provider
VAX Virtual Address eXtended (Digital equipment corporation)
VBR Variable Bit Rate (ATM)
VBR-NRT Variable BitRate (Non Real Time)
VBR-RT Variable BitRate (Real Time)
vc Saint Vincent and the Grenadines
VC Virtual Call
VC Virtual Channel, virtual connection or virtual circuit RFC 3031
VC Virtual Container (SDH)
VC-4 Virtual Container of SDH with 149.76 Mbit/s transmission rate
VC-11 Virtual Container of SDH with 1544 kbit/s transmission rate
VC-12 Virtual Container of SDH with 2048 kbit/s transmission rate
VC-21 Virtual Container of SDH with 6312 kbit/s transmission rate
VC-22 Virtual Container of SDH with 8448 kbit/s transmission rate
VC-31 Virtual Container of SDH with 34.368 Mbit/s transmission rate
VC-32 Virtual Container of SDH with 44.736 Mbit/s transmission rate
VC CEPF Virtual Connection Connection End Point Functions
VC CPF Virtual Connection Connecting Point Functions
vCard visiting Card file of type .vcf RFC 2739
VCC Virtual Channel Connection (ATM)
VCCE Virtual Channel Connection Endpoint
VCDIFF also Vcdiff---a compressed data format based on the Vdelta algorithm RFC 3284
vcf visiting card file RFC 2739
VCI Virtual Channel Identifier (ATM) ITU-T I.361
VCI Virtual Circuit Identifier RFC 3031
VCID Virtual Connection Identifier (ATM) RFC 3038
VCL Virtual Channel Link
VC-n Virtual Container of order n (SDH)
VDISCARD Toggles the flushing of terminal output (pseudo-terminal mode)
VDSUSP Another suspend character (pseudo-terminal mode)
VDU Video Display Unit
ve Venezuela
VEMMI VErsatile MultiMedia Interface RFC 2122
VENUS Very Extensive Non-Unicast Service RFC 2191
VEOF End-of-file character (pseudo-terminal mode)
VEOL End-of-line character in addition to carriage return line feed (pseudo-terminal mode)
VEOL2 Additional end-of-line character (pseudo-terminal mode) ver version number
VERASE Erase the character to left of the cursor (pseudo-terminal mode)
VF Variance Factor
VF Voice Frequency
VFIP Voice File Interchange Protocol RFC 0978
VFLUSH Character to flush output (pseudo-terminal mode)
VFS Virtual File System
vg Virgin Islands (British)
VGA Video Graphics Array
vi Virgin Islands (USA)
VID VLAN Identifier IEEE 802.1p
VINTR Interrupt character (pseudo-terminal mode)
VISCII VIetnamese Standard Code for Interchange of Information RFC 1456
VKILL Kill the current input line (pseudo-terminal mode)
VLAN Virtual-bridged Local Area Network or Virtual Local Area Network IEEE 802.1q IEEE 802.1u
VLAN Virtual bridged Local Area Network RFC 2643, RFC 2674 (MOs), RFC 3069, IEEE 802.1q
VlanHello Cabletron's VlanHello protocol RFC 2641
VLNEXT Enter the next character typed, even if it is a special character (pseudo-terminal mode)
VLS Cabletron Virtual LAN Link State Protocol RFC 2642
VLSM Variable Length Subnet Mask RFC 1219, RFC 1517-8, RFC 1519 (CIDR)
VM Virtual Machine (IBM)
VMA VPN (Virtual Private Network) Multicast Address RFC 2917
VMTP Versatile Message Transaction Protocol RFC 1045
vn Vietnam
VNS Nortel Virtual Networking Switching RFC 2340
VoD Video On Demand
VOIP Voice Over Internet Protocol ITU-T H.323
VP Virtual Path (ATM) RFC 3031
VP CEPF Virtual Path Connection End Point Functions
VP CPF Virtual Path Connecting Point Functions
VPC Virtual path connection (ATM)
VPCE Virtual Path Connection Endpoint
VPI Virtual Path Identifier (ATM) ITU-T I.361
VPI Virtual Path Identifier RFC 3031
VPIM Voice Profile for Internet Mail RFC 1911, RFC 2421 (v2), RFC 2423
VPL Virtual Path Link
VPN Virtual Private Network RFC 2547 (BGP), RFC 2735, RFC 2764 (IP), RFC 2917 (MPLS)
VPNI Virtual Private Networks Identifier RFC 2685, RFC 2917
VPNID Virtual Private Networks IDentifier RFC 2917
VPT Virtual Path Terminator
VP-XC Virtual Path crossConnect
VQUIT quit character (pseudo-terminal mode)
VR Virtual Route (IBM SNA)
VR Virtual Router RFC 2917
VRC Virtual Router Console RFC 2917
VREPRINT Reprints the current input line (pseudo-terminal mode)
VRFY VeRiFY (SMTP)
VRRP Virtual Router Redundancy Protocol RFC 2338, RFC 2787 (MOs)
VSTART Continues paused output (normally control-Q) (pseudo-terminal mode)
VSTATUS Prints system status line (load, command, pid, etc.) (pseudo-terminal mode)
VSTOP Pauses output (normally control-S) (pseudo-terminal mode)
VSUSP Suspends the current program (pseudo-terminal mode)
VSWTCH Switch to a different shell layer (pseudo-terminal mode)
VT Virtual Terminal RFC 0782
VT Virtual Tributary (SONET)
VT Vertical Tab (see ASCII)
VT1.5 Virtual Tributary of SONET with 1544 kbit/s transmission rate
VT100 ASCII based Virtual Terminal developed by the Digital equipment corporation
VT-100 Virtual Terminal-100 (a terminal emulation device conforming to DECNET)
VT2.0 Virtual Tributary of SONET with 2048 kbit/s transmission rate
VT3.0 Virtual Tributary of SONET with 3152 kbit/s transmission rate
VT6.0 Virtual Tributary of SONET with 6312 kbit/s transmission rate
VTAM Virtual Telecommunications Access Method (IBM SNA)
VTE Virtual Terminal Environment
VTOA Voice Over ATM
vu Vanuatu
W
VWERASE Erases a word left of cursor (pseudo-terminal mode)
WAE Wireless Application Environment (WAP) www.wapforum.org
WAL2 (line code)
WAN Wide Area Network
WAP Wireless Application Protocol www.wapforum.org
WARC World Administrative Radio Council
WAVE wave file of type. wav RFC 2361
WCCP Web Cache Control Protocol RFC 3040
WDM Wavelength Division Multiplexing
WDP Wireless Datagram Protocol (WAP) www.wapforum.org
WDS Wireless Distribution System (WLAN) IEEE 802.11
WEBDAV HTTP extension for Distributed Authoring and Versioning RFC 2518, RFC 3253
WEBI WEB Intermediaries
WebNFS Web Network File System RFC 2054-5, RFC 2755
WEN WAN-Error-Notify (L2TP) RFC 2661
WEP Wireless Equivalent Privacy (WLAN) IEEE 802.11
wf Wallis and Futuna Islands
WF Wildcard Filter style (RSVP) RFC 2205
WG Working Group
WHOIS A command associated with the IETF NICNAME service RFC 0812, RFC 0954, RFC 1834, RFC 1835 (Whois++), RFC 1913-4 (Whois++), RFC 2957-8
WINS Windows Internet Name Server
WLAN Wireless Local Area Network IEEE 802.11
WLL Wireless Local Loop
WML Wireless Markup Language www.wapforum.org
WPAD Web Proxy Auto-discovery Protocol RFC 3040
WPKI WAP Public Key Infrastructure www.wapforum.org
WP-TCP Wireless Profiled Transport Control Protocol www.wapforum.org
WRQ Write ReQuest (TFTP)
ws Western Samoa
WS Window Size
WS WorkStation
WSF WorkStation Function
WSOPT Window Scale OPTion (TCP) RFC1323
WSP Wireless Session Protocol www.wapforum.org
WSP Wireless Session Protocol (WAP)
WTA Wireless Telephony Application www.wapforum.org
WTAI Wireless Telephony Application Interface www.wapforum.org
WTLS Wireless Transport Layer Security protocol (WAP) www.wapforum.org
WTP Wireless Transaction Protocol (WAP) www.wapforum.org
W/U Wanted to Unwanted signal ratio
WWW World Wide Web RFC 1630, RFC 2594 (MOs)
X
X eXtension bit
X.3 packet assembler/disassembler specification ITU-T X.3
X.21 ITU-T recommendation X.21 (highspeed DTE-to-DCE interface) ITU-T X.21
X.25 packet network UNI ITU-T X.25
X.28 interface between a DTE and a PAD (packet network) ITU-T X.28
X.29 procedure for synchronous/asynchronous communication across a packet network ITU-T X.29
X.75 packet network NNI ITU-T X.75
X.121 ITU-T recommendation defining public data network numbering scheme ITU-T X.121
X.400 ITU-T recommendation defining the message handling service (MHS) ITU.T X.400
X.500 ITU-T recommendation defining the directory service ITU-T X.500
X.509 ITU-T recommendation defining public key infrastructure (PKI) for network security ITU-T X.509
X11 X-windows protocol version 11 www.x.org
XACML eXtensible Access Control Markup Language
XCASE Enable input and output of uppercase characters by preceding their lowercase equivalents with `/'. (pseudo-terminal mode)
XDR eXternal Data Representation RFC 1014, RFC 1832
xDSL generic name for Digital Subscriber Line systems
XID eXchange Identification or transaction Identification
XML eXtensible Markup Language RFC 2376, RFC 2807, RFC 3017, RFC 3023, RFC 3075, RFC 3076, RFC 3120, RFC 3275
XMP X Manager Protocol (a mapping function---common handler between CMIS/CMIP)
XNS Xerox Network System
XNSCP FTP Recipient Scheme selection RFC 1764
X-OFF Transmit `off' at DTE/DCE interface - data may not be sent
X-ON Transmit `on' at DTE/DCE interface - data may be sent
XON/XOFF flow control protocol
XOT X.25 Over TCP/IP
XPG X/Open Portability Guides
XRCP PPP XNS IDP Control Protocol RFC 0743
XRSQ FTP ReCiPient specification RFC 0743
XSEN FTP SENd to terminal RFC 0737
XTERM X-windows TERMinal emulator www.x.org
XTI X/Open Transport Interface
XTP Xpress Transfer Protocol
X-Windows uniX-Windows---a graphical user interface for UNIX similar to Windows RFC 1013 (v11)
Y
ye Yemen
yiaddr Your IP ADDRess (BOOTP/DHCP) RFC 0951
YP Yellow Pages (SUN)
yt Mayotte
yu Yugoslavia
Z
za South Africa
ZBTSI Zero Byte Time Slot Interchange (line code)
ZIP Zone Information Protocol (Appletalk)
ZLB Zero-Length Body
ZLIB compressed data format RFC 1950 (v3.3)
zm Zambia
zrc Zero-Restart-Count RFC 1661 (PPP)
zw Zimbabwe