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
F
t
Foot; fault tolerant (e.g., VAXF
t
)
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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