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Appendix E - Acronyms and Abbreviations

Cisco & IP Addressing
Louis D. Rossi, Louis R. Rossi and Thomas Rossi
  Copyright © 1999 The McGraw-Hill Companies, Inc.

Appendix E: Acronyms and Abbreviations
Overview
  3270 Reference to a 3270 data stream (arrangement of data)
  3770 Reference to remote job entry
  370/XA 370/eXtended Architecture
  5250 Reference to a 5250 data stream (arrangement of data)
  AAA Autonomous administrative area
  AAI Administration authority identifier
  AAL ATM adaptation layer
  AARP AppleTalk address resolution protocol
  AC Access control
  ACB Application control block; access (method) control block
  ACCS Automated calling card service
  ACD Automatic call distribution
  ACDF Access control decision function
  ACE Access control (list) entry; asynchronous communication element
  ACF Access control field; advanced communications function
  ACIA Access control inner areas; asynchronous communication interface adapter
  ACID Automicity, consistency, isolation, and durability
  ACK Positive acknowledgment
  ACL Access control list
  ACP Ancillary control process
  ACS Access control store
  ACSA Access control specific area
  ACSE Association control service element
  ACSP Access control specific point
  ACTLU Activate logical unit
  ACTPU Activate physical unit
  ACU Autocalling unit
  AD Addendum document to an OSI standard
  ADMD Administrative management domain
  ADP Adapter control block; AppleTalk data stream protocol
  ADPCM Adaptive differential pulse code modulation
  ADSP AppleTalk data stream protocol
  AE Application entity
  AEI Application entity invocation
  AEP AppleTalk echo protocol
  AET Application entity title
  AF Auxiliary facility
  AFI Authority and format identifier; AppleTalk filing interface
  AFP AppleTalk filing protocol
  AID Attention identifier
  AIFF Audio interchange file format
  AIX Advanced (also Account) Interactive eXecutive
  ALS Application-layer structure
  ALU Application-layer user; arithmetic logic unit
  AM Amplitude modulation
  AMI Alternating mark inversion
  ANI Automatic number identification
  ANS American National Standard
  ANSI American National Standards Institute
  AP Application process; argument pointer
  APAR Authorized program analysis report
  APB Alpha primary bootstrap
  APD Avalanche photodiode
  APDU Application protocol data unit
  API Application program (also programming) interface
  APLI ACSE/Presentation Library Interface
  APP Applications portability profile
  APPC Advanced Program-to-Program Communication
  APPL Application program
  APPN Advanced Peer-to-Peer networking
  APT Application Process Title
  ARF Automatic reconfiguration facility
  ARI Address-recognized indicator
  ARP Address resolution protocol
  ARPA Advanced Research Projects Agency
  ARQ Automatic repeat request
  ARS Automatic route selection
  AS/400 Application system/400
  ASC Accredited Standard Committee
  ASCII American Standard Code for Information Interchange
  ASDC Abstract service definition convention
  ASE Application service element
  ASM Address space manager
  ASN Abstract syntax notation
  ASN.1 Abstract Syntax Notation One
  ASO Application service object
  ASP Abstract service primitive; AppleTalk session protocol; attached support processor
  AST Asynchronous system trap
  ASTLVL Asynchronous system trap level
  ASTSR Asynchronous system trap summary register
  AT Advanced Technology (IBM Computers)
  ATM Asynchronous transfer mode; abstract text method; automated teller machine
  ATP AppleTalk transaction protocol
  ATS Abstract test suite
  AU Access unit
  AUI Attachment unit interface
  AVA Attribute value assertion
  AVS APPC/VM VTAM support
  AXP A DEC hardware and operating system architecture
  B-ISDN Broadband ISDN
  B8ZS Bipolar 8-zeros substitution
  BACM Basic access control model
  BAS Basic activity subset
  BASIC Beginner’s All-purpose Instruction Code
  BB Begin bracket
  BC Begin chain
  BCC Block-check character
  BCN Backward congestion notification
  BCS Basic combined subset
  BCVT Basic class virtual terminal
  BECN Backward explicit congestion notification
  Bellcore Bell Communications Research, Inc.
  BER Box event records; bit error rate
  BF Boundary function
  BIS Bracket initiation stopped
  BISYNC Binary synchronous (IBM protocol)
  bits/s bits per second
  BIU Basic information unit
  BLU Basic link unit
  BMS Basic mapping support
  BMU Basic measurement unit
  BN Backward notification; boundary node
  BNN Boundary network node
  BOC Bell Operating Company
  BOM Beginning of message
  BRI Basic rate interface
  BSC Binary synchronous communication
  BSD Berkeley standard distribution
  BSS Basic synchronization subset
  BTAM Basic telecommunications access method
  BTU Basic transmission unit
  CA Channel adapter (also attachment); certification authority
  CAD Computer-aided design
  CAE Common applications environment
  CAF Channel auxiliary facility
  CAI Computer-assisted instruction
  CAR Car area network
  CASE Common application service element
  CATV Community antenna television
  CBEMA Computer & Business Equipment Manufacturers Association
  CC Chain command
  CCA Conceptual (also “common”) communication area
  CCB Connection control block; channel control block
  CCIS Common channel interoffice signaling
  CCITT Consultative Committee in International Telegraphy and Telephony
  CCO Context control object
  CCR Commitment, concurrency, and recovery
  CCS Common communications support; common channel signaling; console communication service
  CCU Central control unit; communications control unit
  CCW Channel command word
  CD Countdown counter; chain data; committee draft
  CDDI Copper-stranded distributed data interface
  CDF Configuration data flow
  CDI Change direction indicator
  CDRM Cross-domain resource manager
  CDRSC Cross-domain resource
  CDS Conceptual data storage (also store); central directory server
  CEBI Conditional end bracket indicator
  CEI Connection endpoint identifier
  CEN/ELEC Committee European de Normalization Electrotechnique  
  CEP Connection endpoint
  CEPT Conference of European Postal and Telecommunications Administrations
  CF Control function
  CFGR Configuration
  CGM Computer Graphics Metafile
  CHILL CCITT High-Level Language
  CHPID Channel path identifier (ID)
  CI Computer interconnect
  CICS Customer Information Control System; customer information communication subsystem
  CID Command (also connection) identifier
  CIGOS Canadian Interest Group on Open Systems
  CIM Computer-integrated manufacturing
  CIR Commitment information rate
  CLAW Common link access to workstation
  CLI Connectionless internetworking
  CLIST Command list
  CLNP Connectionless network protocol
  CLNS Connectionless network service
  CLP Cell loss priority
  CLSDST Close destination
  CLTP Connectionless transport protocol
  CLTS Connectionless transport service
  CLU Control logical unit
  CMC Communication management configurations
  CMIP Common management information protocol
  CMIS Common management information service
  CMISE Common management information service element
  CMOL CMIP over logical link control
  CMOT CMIP over TCP/IP
  CMS Conversational monitoring system
  CMT Connection management
  CN Composite node
  CNM Communication network management
  CNMA Communication network for manufacturing applications
  CNMI Communication network management interface
  CNN Composite network node
  CNOS Change number of sessions
  CNT Communications name table
  CO Central office
  COCF Connection-oriented convergence function
  CODEC Coder/decoder
  COI Connection-oriented internetworking
  COM Continuation-of-message DMPDU
  CONF Confirm
  CONS Connection-oriented network service
  COS Class-of-service; Corporation for Open Systems
  COSM Class-of-service manager
  COSS Connection-oriented session service
  COTP Connection-oriented transport protocol
  COTS Connection-oriented transport service
  CP Control point; control program
  CPCB Control program (also point) control block
  CPCS Common part convergence sublayer
  CPE Customer premises equipment
  CPF Control program facility
  CPI Common programming interface
  CPI-C Common programming interface with C language
  CPMS Control point management services
  CPU Central processing unit
  CR Command response
  CRC Cyclical redundancy check
  CRT Cathode-ray tube
  CRV Call reference value
  CS Circuit switching; convergence sublayer; configuration services; console
  CS-MUX Circuit-switching multiplexer
  CSA Common service (also storage) area
  CSALimit Common service area (buffer use) limit
  CSMA/CA Carrier-sense multiple access with collision avoidance
  CSMA/CD Carrier-sense multiple access with collision detection
  CSP Communications scanner processor
  CSS Control, signaling, and status store
  CSU Channel service unit
  CTC Channel-to-channel
  CTCA Channel-to-channel adapter
  CTCP Communication and transport control program
  CTS Clear-to-send; common transport semantics
  CUA Channel unit address; common user access
  CUG Cluster user group
  CUT Control unit terminal
  CVT Communications vector table
  DA Destination address
  DACD Directory access control domain
  DACTPU Deactivate physical unit
  DAD Draft addendum
  DAF Framework for distributed applications; destination address field
  DAP Directory (also data) access protocol
  DARPA Defense Advanced Research Projects Agency
  DAS Dual-attachment station; dynamically assigned sockets; dual-address space
  DASD Direct-access storage device
  DAT Dynamic address translation
  dB Decibel
  DBCS Double-byte character set
  DBK Definition block
  DC Data chaining
  DCA Document-content architecture; Defense Communication Agency
  DCC Data Country Code
  DCE Data communications equipment; distributed computing environment; data circuit-terminating equipment
  DCL Digital Command Language (DEC)
  DCLI Data-link connection identifier
  DCS Defined context set
  DCSS Discontiguous shared segment
  DDB Directory database
  DDCMP Digital’s (DEC’s) data communications message protocol
  DDDB Distributed DDB
  DDM Distributed data management
  DDN Defense Data Network
  DDName Data definition name
  DDP Datagram delivery protocol
  DDS Digital data service
  DE Discard eligibility; directory entry
  DEA Directory entry attribute
  DEC Digital Equipment Corporation
  DECdts DEC distributed time service
  DECNET Digital equipment (DEC) network architecture
  DELNI DEC local network interconnect
  DES Data Encryption Standard
  DEUNA Digital Ethernet Unibus Network Adapter
  DEV Device address field
  DFC Data flow control
  DFI DSP format identifier
  DFT Distributed function terminal
  DH DMPDU header
  DIA Document Interchange Architecture
  DIB Directory information base
  DIS Draft International Standard
  DISC Disconnect
  DISP Draft International Standardized Profile; directory information shadowing protocol
  DIT Directory information tree
  DIU Distribution interchange unit
  DIX DEC, Intel, and Xerox
  DL Distribution list
  DLC Data-link control (also connection)
  DLCEP Data-link connection endpoint
  DLCI Data-link connection identifier
  DLPDU Data-link protocol data unit
  DLS Data-link service
  DLSAP Data-link service access point
  DLSDU Data-link service data unit
  DLU Dependent (also destination) logical unit
  DLUR Dependent logical unit requestor
  DLUS Dependent logical unit server
  DM Disconnected mode
  DMA Direct memory access
  DMD Directory management domain
  DMI Digital multiplexed interface; definition of management information
  DMO Domain management organization
  DMPDU Derived MAC protocol data unit
  DMUX Double multiplexer
  DN Distinguished name
  DNA Digital Network Architecture
  DNHR Dynamic nonhierarchical routing
  DNS Domain name service (also system)
  DoD U.S. Department of Defense
  DOP Directory operational binding management protocol
  DOS Disk operating system
  DP Draft proposal
  DPG Dedicated packet group
  DPI Dots per inch
  DQDB Distributed queue dual bus
  DR Definite response; dynamic reconfiguration
  DRDA Distributed Relational Database Architecture
  DRDS Dynamic reconfiguration data set
  DRSLST Direct search list
  DS Directory service(s); desired state
  DS-n Digital signaling level n
  DSA Directory service agent; Digital (DEC) storage architecture
  DSAP Destination service access point
  DSD Data structure definition
  DSE DSA-specific entry; data-switching exchange
  DSL Digital subscriber line
  DSname Data-set name
  DSP Directory service protocol; domain-specific part
  DSS 1 Digital subscriber signaling system No. 1
  DSSI Digital (DEC) small systems (also storage systems) interconnect
  DSTINIT Data services task initialization
  DSU Digital services unit
  DSUN Distribution services unit name
  DT DMPDU trailer
  DTE Data terminal equipment
  DTMF Dual-tone multifrequency
  DTR Data terminal ready
  DU Data unit
  DUA Directory user agent
  DVT Destination vector table
  E-mail Electronic mail
  EAB Extended addressing bit
  EAS Extended area service
  EB End bracket
  EBCDIC Extended Binary-Coded Decimal Interchange Code
  ECC Enhanced error checking and correction
  ECH Echo canceller with hybrid
  ECMA European Computer Manufacturers’ Association
  ECO Echo control object
  ECSA Exchange Carriers Standards Association
  ED End delimiter
  EDI Electronic Data Interchange
  EDIFACT EDI for administration, commerce, and transport
  EDIM EDI message
  EDIME EDI messaging environment
  EDIMS EDI messaging system
  EDI-MS EDI message store
  EDIN EDI notification
  EDI-UA EDI-user agent
  EEI External environment interface
  EGP Exterior gateway protocol
  EIA Electronic Industries Association
  EIT Encoded information type
  ELAP EtherTalk LAP
  EMA Enterprise management architecture
  EMI Electromagnetic interference
  EN End node
  ENA Extended network addressing
  EOM End-of-Message DMPDU
  EOT End of transmission
  EP Emulation program; echo protocol
  ER Explicit route; exception response
  EREP Environmental recording editing and printing
  ERP Error-recovery procedure
  ES End system
  ESA Enterprise system architecture; Enhanced Subarea Addressing
  ESCON Enterprise System Connection
  ESF Extended superframe format
  ESH End system hello
  ES-IS End system to intermediate system
  ESS Electronic switching system
  ESTELLE Extended State Transition Language
  ETB End-of-text block
  ETR Early token release
  ETX End of text
  EVE Extensible VAX Editor
  EWOS European Workshop on Open Systems
  EXLST Exit list
  EXT External trace (file)
  FADU File access data unit
  FAS Frame alignment sequence
  FC Frame-check; frame control (field)
  FCC Federal Communications Commission
  FCI Frame-copied indicator
  FCS Frame-check sequence
  FDCO Field definition control object
  FDDI Fiber Distributed Data Interface
  FDDI-FO FDDI follow-on
  FDL File Definition Language (DEC)
  FDM Frequency-division multiplexing
  FDR Field definition record
  FDT Formal description technique
  FDX Full-duplex
  FEC Field entry condition
  FECN Forward explicit congestion notification
  FEE Field entry event
  FEI Field entry instruction
  FEICO Field entry instruction control object
  FEIR Field entry instruction record
  FEP Front-end processor
  FEPCO Field entry pilot control object
  FEPR Field entry pilot record
  FER Field entry reaction
  FFOL FDDI follow-on LAN
  FH Frame handler
  FID Format identification
  FIFO First in, first out
  FIPS Federal Information Processing Standard
  FM Function management; frequency modulation
  FMD Function management data
  FMH Function management header
  FN Forward notification
  FOD Office Document Format
  FQPCID Fully qualified procedure correlation identifier
  FRAD Frame relay access device
  FRFH Frame relay frame handler
  FRMR Frame reject
  FRSE Frame relay switching equipment
  FRTE Frame relay terminal equipment
  FS Frame status field
  FSG SGML interchange format
  FSK Frequency-shift keying
  FSM Finite-state machine
  Ft Foot; fault tolerant (e.g., VAXFt)
  FTAM File transfer and access management
  FTP File transfer protocol in TCP/IP
  FX Foreign exchange service
  GAP Gateway access protocol
  Gbits Gigabits
  Gbits/s Gigabits per second
  Gbyte Gigabyte
  GCS Group control system
  GDDM Graphical data display manager
  GDMO Guidelines for the definition of managed objects
  GDS General data stream
  GEN Generation
  GFC Generic flow control
  GFI General format indicator
  GOSIP Government OSI profile
  GSA General Services Administration
  GTF Generalized trace facility
  GUI Graphical user interface
  GWNCP Gateway NCP
  GWSSCP Gateway SSCP
  H-MUX Hybrid multiplexer
  HAN House area network
  HASP Houston Automatic Spooling Priority
  HCD Hardware configuration definition
  HCS Header check sequence
  HDB3 High-density bipolar—3 zeros
  HDLC High-level data-link control
  HDX Half-duplex (also HD)
  HEC Header error correction
  hex Hexadecimal
  HFS Hierarchical file system
  HI-SAP Hybrid isochronous–MAC service access point
  HMI Human-machine interface
  HMP Host monitoring protocol
  HOB Head of bus
  HP Hewlett-Packard
  HP-SAP Hybrid packet–MAC service access point
  HRC Hybrid ring control
  HS Half session
  HSC Hierarchical storage controller
  HSLN High-speed local network
  Hz Hertz (cycles per second)
  IAB Internet Architecture Board
  IADCS Interactivity defined context set
  IAN Integrated analog network
  IAP Inner administrative point
  IAS Interactive Application System
  IBM International Business Machines Corporation
  IC Interexchange carrier
  ICA Integrated communication adapter
  ICCF Interactive computing and control facility
  ICD International code designator
  ICF Isochronous convergence function
  ICI Interface control information
  ICMP Internet control message protocol
  ICP Interconnect control program
  ICV Integrity check value
  ID Identifier or identification
  IDA Indirect data addressing
  IDI Initial domain identifier
  IDN Integrated digital network; interface definition notation
  IDP Initial domain part; internetwork datagram packet (protocol)
  IDU Interface data unit
  IEC Interexchange carrier; International Electrotechnical Com-mission
  IEEE Institute of Electrical and Electronic Engineers
  IETF Internet Engineering Task Force
  IHL Internet header length
  IIA Information interchange architecture
  ILD Injection laser diode
  ILU Independent (also initiating) logical unit
  IMAC Isochronous media access control
  IMIL International Managed Information Library
  IML Initial microcode load
  IMPDU Initial MAC protocol data unit
  IMR Intensive mode recording
  IMS Information Management System
  IMS/VS Information Management System/Virtual Storage
  IN Intelligent network; interchange node
  IND Indication
  INN Intermediate network node
  INTAP Interoperability Technology Association for Information Processing
  I/O Input/output
  IOC Input/output control
  IOCDS Input/output configuration data set
  IOCP Input/output control (also channel or configuration) program
  IONL Internal organization of network layer
  IOPD Input/output problem determination
  IP Internet protocol
  IPC Interprocess communication
  IPCS Interactive problem control system
  IPDS Intelligent printer data stream
  IPI Initial protocol identifier
  IPICS ISP implementation conformance statement
  IPL Initial program load(er)
  IPM Interpersonal message
  IPMS Interpersonal messaging system
  IPM-UA Interpersonal messaging user agent
  IPN Interpersonal notification
  IPR Isolated pacing response
  IPX Internetwork packet exchange
  IR Internet router
  IRN Intermediate routing node
  IRSG Internet Research Steering Group
  IRTF Internet Research Task Force
  IS International Standard
  ISAM Index-sequential access method
  ISC Intersystem communications in CICS
  ISCF Intersystem control facility
  ISDN Integrated Services Digital Network
  ISE Integrate storage element
  ISH Intermediate system hello
  IS-IS Intermediate system-to-intermediate system
  ISO International Standards Organization
  ISODE ISO development environment
  ISP International Standard Profile
  ISPBX Integrated Services Private Branch Exchange
  ISPF Interactive System Productivity Facility
  ISPSN Initial synchronization point serial number
  ISR Intermediate session routing
  ISSI Interswitching system interface
  ISUP ISDN user part
  IT Information technology
  ITC Independent telephone company
  ITU International Telecommunication Union
  IUCV Interuser communication vehicle
  IUT Implementation under test
  IVDT Integrated voice/data terminal
  IWU Interworking unit
  IXC Interexchange carrier
  JCL Job Control Language
  JES2, JES3 Job Entry Subsystem 2, 3
  JTC Joint Technical Committee
  JTM Job transfer and manipulation
  kbits Kilobits
  kbits/s Kilobits per second
  kbyte Kilobyte
  kHz Kilohertz
  km Kilometer
  LAB Latency adjustment buffer; line attachment base
  LAN Local area network
  LANRES Local Area Network Resource Extension Services
  LANSUP LAN adapter NDIS support
  LAP Link-access procedure (also protocol)
  LAPB Link-access procedure balanced
  LAPD Link-access procedure on the D channel
  LAPM Link-access procedure for modems
  LAPS LAN adapter and protocol support
  LATA Local access and transport area
  LCF Log control function
  LCN Logical channel number
  LDDB Local directory database
  LE Local exchange
  LEC Local exchange carrier
  LED Light-emitting diode
  LEN Low-entry networking
  LFSID Local form session identifier
  LH Link header
  LI Length indicator
  LIB Line interface base
  LIC Line interface coupler
  LIDB Line information database
  LIVT Link integrity verification test
  LLAP LocalTalk link access protocol
  LLC Logical link control
  LL2 Link level 2
  LME Layer management entity
  LMI Layer (also local) management interface
  LOCKD Lock manager daemon
  LOTOS Language of Temporal Ordering Specifications
  LPAR Logical partitioned (mode)
  LPD Line printer daemon
  LPDA Link problem determination application
  LPR Line printer
  LRC Longitudinal redundancy check
  LS Link station
  LSE Local system environment
  LSL Link support layer
  LSP Link-state packet
  LSS Low-speed scanner
  LT Local termination
  LU Logical unit
  m Meters
  MAC Media (also medium) access control
  MACE Macintosh audio compression and expansion
  MACF Multiple association control function
  MAN Metropolitan area network
  MAP Manufacturing automation protocol
  MAU Media access unit; multistation access unit
  MBA MASSBUS adapter
  Mbits Megabits
  Mbits/s Megabits per second
  Mbyte Megabyte
  Mbytes/s Megabytes per second
  MBZ Must be zero
  MCF MAC convergence function
  MCI Microwave Communications, Inc.
  MCP MAC convergence protocol
  MCR Monitor console routine
  MD Management domain
  MFA Management functional areas
  MFD Master file directory
  MFJ Modified final judgment
  MFS Message formatting services in IMS
  MH Message handling (package)
  MHS Message handling service (also system)
  MHz Megahertz
  mi Mile
  MIB Management (also message) information base
  MIC Media interface connector
  MID Message identifier
  MIM Management information model
  min Minute
  MIN Multiple interaction negotiation
  MIPS Million instructions per second
  MIS Management information system
  MIT Management information tree; Massachusetts Institute of Technology
  MLID Multiple-link interface driver
  MMF Multimode fiber
  MMS Manufacturing message specification (also messaging service)
  MNP Microcom networking protocol
  MOP Maintenance operations protocol
  MOSS Maintenance and operator subsystem
  MOT Means of testing
  MOTIS Message-oriented text interchange system
  MPAF Midpage allocation field
  MPC Multipath channel
  MPG Multiple preferred guests
  MPP Multiple-protocol package
  MQ Message queue
  MRO Multiregion operation in CICS
  ms Millisecond
  MS Management services; message store
  MSCP Mass storage control protocol
  MSG Console messages
  MSHP Maintain system history program
  MSN Multiple systems networking
  MSNF Multiple systems networking facility
  MSS MAN switching system
  MST Multiplexed slotted and token ring
  MSU Management services unit
  MTA Message transfer agent
  MTACP Magnetic tape ancillary control process
  MTBF Mean time between failures
  MTP Message transfer part
  MTPN Multiprotocol Transport Networking
  MTS Message transfer system
  MTSE Message transfer service element
  MTU Maximum transfer unit
  µm Micrometer
  MVC Multicast virtual circuit
  MVI Major vector identifier
  MVL Major vector length
  MVS Multiple virtual systems
  MVS/370 Multiple Virtual Storage/370 (IBM)
  MVS/XA Multiple Virtual Storage/Extended Architecture (IBM)
  MVT Multiprogramming with a variable number of tasks
  NAK Negative acknowledgment in BSC
  NAU Network-addressable (also -accessible) unit
  NAUN Nearest active upstream neighbor
  NBP Name-binding protocol
  NC Network connection; numerical controller
  NCB Node control block
  NCCF Network communications control facility
  NCEP Network connection endpoint
  NCP Network control program; network (also NetWare) core protocol
  NCS Network computing system
  NCTE Network channel-terminating equipment
  NDF NCP/EP definition facility
  NDIS Network driver interface specification
  NetBIOS Network basic input/output system
  NETID Network ID
  NFS Network file system (also server)
  NIB Node identification (also initialization) block
  NIC Network interface card
  NIF Network information file
  NIS Names information socket
  NIST National Institute of Standards and Technology
  NIUF North American ISDN Users’ Forum
  NJE Network job entry
  NLDM Network logical data manager
  NLM NetWare loadable module
  nm Nanometer
  NM Network management (also model)
  NMP Network management process
  NMVT Network management vector transport
  NN Network node
  NNI Network node interface
  NNT NetView-NetView task
  NOF Node operator facility
  NPA Numbering plan area
  NPCI Network protocol control information
  NPDA Network problem determination application
  NPDU Network protocol data unit
  NPM NetView performance monitor
  NPSI Network packet-switching interface
  NR Number of receives; negative response
  NREN National Research and Education Network
  NRF Network routing facility
  NRN Nonreceipt notification
  NRZ Non-return-to-zero
  NRZI Non-return-to-zero inverted
  ns Nanosecond
  NS Network service; number of sends
  NSAP Network service access point
  NSDU Network service data unit
  NSF Network search function; National Science Foundation
  NSFNET National Science Foundation Network
  NSP Network services protocol
  NTO Network terminal option
  NVLAP National Voluntary Accreditation Program
  NVP Network voice protocol
  OAF Origination address field
  OAM Operations, administration, and maintenance
  OAM&P Operations, administration, maintenance, and provisioning
  OC-n Optical carrier level n
  OCA Open communication architectures
  OCC Other common carrier
  ODA Office (also open-) document architecture
  ODI Open data-link interface
  ODIF Office document interchange format
  ODINSUP ODI NSIS support
  ODP Open distributed processing
  OIT Object identifier tree
  OIW OSI Implementation Workshop
  OLRT Online real time
  OLU Origin(ating) logical unit
  OM Object management
  ? Ohm
  ONA Open-network architecture
  OPNDST Open destination
  O/R Originator/recipient
  OS Operating System
  OS/400 Operating System/400 for the AS/400 Computer
  OSAK OSI application kernel
  OSE Open-systems environment
  OSF Open Software Foundation
  OSI Open-systems interconnection
  OSI/CS OSI communications subsystem
  OSIE Open-systems interconnection environment
  OSILL Open-systems interconnection lower layers
  OSIUL Open-systems interconnection upper layers
  OSNS Open Systems Network Services
  OSPF Open shortest path first
  P-MAC Packet-switched media access control
  PA Prearbitrated
  PABX Private automatic branch exchange
  PAD Packet assembler/disassembler
  PAF Prearbitrated function
  PAI Protocol address information
  PANS Pretty amazing new stuff
  PAP Printer access protocol
  PARC Palo Alto (Calif.) Research Center
  PBX Private branch exchange
  PC Path control; personal computer
  PCCU Physical communications control unit
  PCEP Presentation connection endpoint
  PCI Protocol (also program) control information; program-controlled interruption; presentation context identifier
  PCM Pulse-code modulation
  PCO Points of control and observation
  PCTR Protocol conformance test report
  PDAD Proposed draft addendum
  PDAU Physical delivery access unit
  PDC Packet data channel
  PDF Program development facility
  pDISP Proposed Draft International Standard Profile
  PDN Public data network
  PDP Programmable data processor
  PDS Partitioned data set
  PDU Protocol data unit
  PDV Presentation data value
  PELS Picture elements
  PEP Partitioned emulation program
  PER Program event recording
  PETS Parameterized executable test suite
  PGF Presentation graphics feature
  PH Packet handler (or packet handling)
  PhC Physical-layer connection
  PhCEP Physical connection endpoint
  PhL Physical layer
  PhPDU Physical-layer protocol data unit
  PhS Physical-layer service
  PhSAP Physical-layer service access point
  PhSDU Physical-layer service data unit
  PHY Physical layer
  PICS Protocol information conformance statement
  PIN Positive-intrinsic negative photodiode
  PING Packet Internet Groper
  PIP Program initialization parameters
  PIU Path information unit
  PIXIT Protocol Implementation eXtra Information for Testing
  PKCS Public key cryptosystems
  PLC Programmable logic controller
  PLCP Physical-layer convergence protocol
  PLP Packet-layer (also level) protocol
  PLS Primary link station
  PLU Primary (also peripheral) logical unit
  PM Protocol machine; phase modulation
  PMD Physical-(layer)-medium-dependent
  POI Program operator interface
  POP Point of presence
  POSI Promoting Conference for OSI
  POSIX Portable Operating System Interface
  POTS Plain old telephone service
  POWER Priority output writers and execution processors and input readers
  PPDU Presentation protocol data unit
  PPO Primary program operator
  PPP Point-to-point protocol
  PPSDN Public packet-switched data network
  PRI Primary rate interface
  PRMD Private management domain
  PROFS Professional office system
  PROM Programmable read-only memory
  PR/SM Processor resource/systems manager
  PS Presentation services
  PSAP Public safety answering point; physical service access point
  PSC Public Service Commission
  PSDN Packet-switched data network
  PSI Packet-switched interface
  PSID Product-set identification
  PSK Phase-shift keying
  PSN Packet-switched network
  PSPDN Packet-switched public data network
  PSTN Public switched telephone network
  PSW Program status word
  PS/2 Personal System/2 (IBM)
  PS/VP Personal System/Value Point (IBM)
  PTF Program temporary fix
  PTLXAU Public Telex Access Unit
  PTN Public telephone network
  PTT Post, Telegraph, and Telephone
  PU Physical unit
  PUC Public utility commission
  PUCP Physical unit control point
  PUMS Physical unit management services
  PUT Program update tape
  PVC Private (also permanent) virtual circuit
  PVN Private virtual network
  PWSS Programmable workstation service
  P1 Protocol 1 (message transfer protocol/MHS/X.400)
  P2 Protocol 2 (interpersonal messaging MHS/X.400)
  P3 Protocol 3 (submission and delivery protocol/ MHS/X.400)
  P5 Protocol 5 (teletext access protocol)
  P7 Protocol 7 (message store access protocol in X.400)
  QA Queued arbitrated
  QAF Queued arbitrated function
  QC Quiesce complete
  QEC Quiesce at end of chain
  QMF Query management facility
  QOS Quality of service
  QPSX Queued packet and synchronous switch
  QUIPU X.500 Conformant Directory Services in ISODE
  RAB Record access block
  RACF Resource access control facility
  RAM Random-access memory
  RARP Reverse address resolution protocol
  RBOC Regional Bell Operating Company
  RD Routing domain; route redirection; request a disconnect
  RDA Relative distinguished names; remote database access
  RDI Restricted digital information
  RDN Relative distinguished name
  RDT Resource definition table
  RECFMS Record formatted maintenance statistics
  REJ Reject
  REQ Request
  RESP Response
  RESYNC Resynchronization
  REXX Restructured Extended Executor (IBM)
  RFC Request for comment
  RFP Request for proposal
  RFQ Request for price quotation
  RH Request (or response) header
  RI Ring in
  RIB Routing information base
  RIF Routing information field
  RIM Request initialization mode
  RIP Router information protocol
  RISC Reduced instruction-set computer
  RJE Remote job entry
  RM Reference model; resource manager
  RMS Record management services (for OpenVMS)
  RMT Ring management
  RN Receipt notification
  RNAA Request network address assignment
  RNR Receive not ready
  RO Ring out
  RODM Resource object data manager
  ROSE Remote-operations service element
  RPC Remote procedure call; remote procedure call in OSF/DCE
  RPL Request parameter list
  RPOA Recognized private operating agency
  RQ Request counter
  RR Receive ready
  RS Relay system
  RSCS Remote spooling communication system
  RSCV Route selection control vector
  RSF Remote support facility
  RSP Response
  RSS Route selection services
  RTM Response-time monitor
  RTMP Routing table maintenance protocol
  RTR Ready to receive
  RTS Request to send
  RTSE Reliable transfer service element
  RTT Round-trip time
  RU Request (or response) unit
  S/390 IBM’s System/390 Hardware Architecture
  s Second
  SA Source address (field); subarea; sequenced application
  SAA System applications architecture; specific administrative area
  SAB Subnetwork-access boundary
  SABM Set asynchronous balanced mode
  SACF Single association control function
  SACK Selective ACKnowledgment
  SAF SACF auxiliary facility
  SALI Source address length indicator
  SAMBE Set asynchronous mode balanced extended
  SAO Single association object
  SAP Service access point; service advertising protocol
  SAPI Service access point identifier
  SAR Segmentation and reassembly
  SAS Single-attachment station; statically assigned sockets
  SASE Specific application service element
  SATF Shared-access transfer facility
  SATS Selected abstract test suite
  SAW Session awareness data
  SBA Set buffer address
  SBCS Single-byte character set
  SBI Stop bracket initiation
  SC Session connection (also connector); subcommittee; session control
  SCA Systems communication architecture
  SCB Session control block
  SCC Specialized common carrier
  SCCP Signaling connection control point
  SCE System control element
  SCEP Session connection endpoint
  SCIF Single-console image facility
  SCM Session control (also connection) manager
  SCP Service control point
  SCS System conformance statement; SNA character string
  SCTR System conformance test report
  SD Start delimiter
  SDDI Shielded distributed data interface
  SDH Synchronous digital hierarchy
  SDIF Standard document interchange format
  SDL System description language
  SDLC Synchronous data-link control
  SDN Software-defined network
  SDSE Shadowed DSA entries
  SDT Start data traffic
  SDU Service data unit
  SE Session entity
  SFD Start frame delimiter
  SFS Shared file system
  SFT System fault tolerance
  SG Study group
  SGFS Special Group on Functional Standardization
  SGML Standard Generalized Markup Language
  SIA Stable implementation agreements
  SIM Set initialization mode
  SIO Start input/output
  SIP SMDS interface protocol
  SLI Suppress-length indication
  SLIP Serial-line Internet protocol
  SLU Secondary logical unit
  SM Session manager
  SMAE System management application entity
  SMASE System management application service element
  SMB Server message block
  SMDR Station message detail recording
  SMDS Switched multimegabit data service
  SMF Single-mode fiber; system management facility
  SMFA Systems management functional area
  SMI Structure of the OSI management information service; Structure of Management Information (language)
  SMIB Stored message information base
  SMP System modification program
  SMS Service management system; storage management subsystem
  SMT Station management standard
  SMTP Simple mail transfer protocol
  SN Subarea node
  SNA System Network Architecture
  SNAcF Subnetwork access function
  SNAcP Subnetwork access protocol
  SNADS SNA distribution services
  SNARE Subnetwork address routing entity
  SNCP Single-node control point
  SNDCP Subnetwork-dependent convergence protocol
  SNI Subscriber-network interface; SNA network interconnection (also interface)
  SNICP Subnetwork-independent convergence protocol
  SNMP Simple network management protocol
  SNPA Subnetwork point of attachment
  SNRM Set normal response mode
  SON Sent (or send) outside the node
  SONET Synchronous optical network
  SP Signaling point; system performance
  SPAG Standards promotion and applications group
  SPC Signaling point code
  SPCS Service point command service
  SPDU Session protocol data unit
  SPE Synchronous payload envelope
  SPI Subsequent protocol identifier
  SPM FDDI-to-SONET physical-layer mapping standard
  SPSN Synchronization-point serial number
  SPX Sequenced packet exchange
  SQE Signal-quality error
  SQL Structured Query Language
  SRB Source route bridging
  SRH SNARE request hello
  SRM System resource manager
  SS Switching system; start/stop (transmission); session services
  SS6 Signaling system 6
  SS7 Signaling system 7
  SSA Subschema specific area
  SSAP Source (also session) service access point
  SSCP System service control point
  SSCS Service-specific convergence sublayer
  SSDU Session service data unit
  SSM Single-segment message DMPDU
  SSP System Support Program
  ST Sequenced terminal
  STACK Start acknowledgment (message)
  STM Synchronous transfer mode; station management
  STM-n Synchronous transport module level n
  STP Shielded twisted pair; service transaction program (in LU6.2); signal transfer point
  STS-n Synchronous transport signal level n
  STX Start of text
  SUT System under test
  SVA Shared virtual area
  SVC Switched virtual circuit
  SVI Subvector identifier
  SVL Subvector length
  SVP Subvector parameters
  SYN Synchronous character in IBM’s bisynchronous protocol
  SYNC Synchronization
  T Transport
  TA Terminal adapter
  TAF Terminal access facility
  TAG Technology advisory group
  TAP Trace analysis program
  Tbyte Terabyte
  TC Transport connection or technical committee
  TCAM Telecommunications access method
  TCB Task control block
  TCC Transmission control code
  TCEP Transport connection endpoint
  TCM Time-compression multiplexing
  TCP Transmission control protocol
  TCP/IP Transmission control protocol/Internet protocol
  TCT Terminal control table in CICS
  TDM Time-division multiplexing; topology database manager
  TDR Time-domain reflectometer
  TE Terminal equipment
  TELNET Remote log-on in TCP/IP
  TEP Transport endpoint
  TFTP Trivial file transfer protocol
  TG Transmission group
  TH Transmission header
  THT Token holding timer
  TIC Token-ring interface coupler
  TIE Translated image environment
  TI RPC Transport-independent RPC
  TLAP TokenTalk LAP
  TLI Transport-layer interface
  TLMAU Telematic access unit
  TLV Type, length, and value
  TLXAU Telex access unit
  TMP Text management protocol
  TMS Time-multiplexed switching
  TMSCP Tape mass storage control protocol
  TOP Technical and office protocol
  TP Transaction program (also processing); transport protocol
  TP 0 TP class 0—simple
  TP 1 TP class 1—basic error recovery
  TP 2 TP class 2—multiplexing
  TP 3 TP class 3—error recovery and multiplexing
  TP 4 TP class 4—error detection and recovery
  TPDU Transport protocol data unit
  TPF Transaction processing facility
  TP-PMD Twisted-pair PMD
  TPS Two-processor switch
  TPSP Transaction processing service provider
  TPSU Transaction processing service user
  TPSUI TPSU invocation
  TR Technical report; token ring
  TRA Token-ring adapter
  TRS Topology and routing services
  TRSS Token-ring subsystem
  TRT Token rotation timer
  TS Transaction services; transport service
  TSAF Transparent services access facility
  TSAP Transport service access point
  TSC Transmission subsystem controller
  TSCF Target system control facility
  TSDU Transport service data unit
  TSI Time-slot interchange
  TSO/E Time Sharing Option/Extension
  TSR Terminate-and-stay-resident program
  TSS Transmission subsystem
  TTCN Tree and tabular combined notation
  TTL Time to live
  TTP Timed token protocol; transport test platform
  TTRT Target token rotation time
  TTY Teletype
  TUP Telephone user part
  TVX Valid transmission timer (FDDI)
  TWX Teletypewriter exchange service
  TZD Time-zone difference
  UA Unnumbered acknowledgment; user agent; unsequenced application
  UART Universal asynchronous receiver/transmitter
  UCB Unit control block; University of California, Berkeley
  UCW Unit control word
  UDI Unrestricted digital information
  UDP User datagram protocol
  UI Unnumbered information
  UNI User network interface
  UOW Unit of work
  UP Unnumbered poll
  USART Universal synchronous/asynchronous receiver/transmitter
  User-ASE User application service element
  USS Unformatted system services
  UT Unsequenced terminal
  UTC Coordinated Universal Time
  UTP Unshielded twisted pair
  UUCP UNIX-to-UNIX copy program
  VAC Value-added carrier
  VAN Value-added network
  VAS Value-added service
  VAX Virtual Address eXtended (operating system; DEC)
  VAXBI VAX bus interface
  VCC Virtual channel connection
  VCI Virtual channel identifier/indicator (DQDB)
  VCNS VTAM common network services
  VDI Video display terminal
  VEST VAX environment software translator
  VIT VTAM internal trace
  VLF Virtual look-aside facility
  VLSI Very large-scale integration
  VM Virtual machine
  VMD Virtual manufacturing device
  VMDBK Virtual machine definition block
  VM/ESA Virtual Machine/Enterprise Systems Architecture
  VMS Virtual memory system
  VM/SP Virtual machine/system product
  VM/SP Virtual Machine/System Product High Performance Option  HPO
  VM/XA Virtual Machine/Extended Architecture
  VPC Virtual path connection
  VPI Virtual path indicator
  VR Virtual route
  VRPWS Virtual route pacing window size
  VS Virtual storage
  VSAM Virtual storage access method
  VSCS VM/SNA console support
  VSE Virtual Storage Extended
  VSE/ESA Virtual Storage Extended/Enterprise Systems Architecture
  VT Virtual terminal
  VTAM Virtual telecommunications access method
  VTE Virtual terminal environment
  VTP Virtual terminal protocol
  VTPM Virtual terminal protocol machine
  VTSE Virtual terminal service element
  VVIEF VAX vector instruction emulation facility
  WACA Write access connection acceptor
  WACI Write access connection initiator
  WAN Wide area network
  WANDD Wide area network device driver
  WAVAR Write access variable
  WBC Wideband channel
  WD Working document
  WG Working group
  WP Working party
  X The XWindow System
  XA Extended Architecture (IBM)
  XAPIA X.400 API Association
  XCF Cross-system coupling facility
  XDF Extended distance facility
  Xdm X display manager
  XDS X/Open Directory Services API
  Xds X display server
  XI SNA X.25 interface
  XID Exchange identification
  XNS Xerox Network Standard
  XRF Extended recovery facility
  XTI X/Open Transport Interface
  ZIP Zone information protocol
  ZIS Zone information socket
  ZIT Zone information table

 


 
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