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From: cdp!anlyyao@labrea.stanford.edu
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To: telecom@eecs.nwu.edu
Subject: comp.dcom.tele: Abbrevations for ISDN & Telecom
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------------------------------------------------------------------------------
Abbrevations for ISDN and Data Communications
1991/01/28, Goetz Kluge Seoul
cdp!anlyyao@labrea.stanford.edu
------------------------------------------------------------------------------
This list has been compiled during my work for a German semiconductor maker
at its Seoul branch. So you also will find some abbrevations related to that
products of that company. But the larger part of this collection is not rela-
ted to my employer. - During my work I got quite fed up with those many abbre-
vations which quite often are not explained in the literature. So allways when
one of these crossed my way, I filed it in this file. There might be some mis-
takes: (a) Sometimes I could not verify which of different explanaitions given
for an abbrevation was the right one. (b) I am Gerrrrman, so is my English.
------------------------------------------------------------------------------
1TR6 (Ger) FTZ regulation (close to CCITT Q.930/931)
2B1Q 2 binary data, 1 quarternary redundance
3PTY Three Party Service (I.254 B)
4B3T 4 binary data, 3 ternary redundance (MMS43)
5B6B 5 binary data, 6 binary redundance (code for OFT lines)
a/b two wire phone connection (T&R)
ABM Asynchronous Balanced Mode ( -> SABME)
ABME ABM extended
ACA Asynchronous Communication Adapter
ACD Automatic Call Distribution
ACFA Advanced CMOS Frame Aligner PEB2030
ACI Answer Controller Interface (IOM2 Monitor Command)
ACIA Asynchronous Communications Interface Adapter
ACK Acknowledge
ACM Address Complete Msg. (SS7: in ISUP)
ACSE Association Control Service Element
ACU Automatic Calling Unit
ADC American Digital Cellular
ADC Analog to Digital Converter
ADCCP Advanced Data Communication Controll Procedure
ADMA Advanced DMA Controller SAB82258
ADPCM Adaptive PCM
AERM Alignment Error Rate Monitor
AFE Analog Front End
AFI Authority and Format Identifier (ISO 7498)
AGND Analog Ground
AI Activate Indication (C/I channel code)
AI Artificial Intelligence
AIS Alarm Indication Signal
AIU AI Upstream
ALE Adress Latch Enable
AM Amplitude Modulation
AMC Add-on Module Connector (-> SIPB)
AMI Alternate Mark Inversion Code
ANM Answer Msg. (SS7: in ISUP)
ANS Answer Msg.
ANSI American National Standards Institute
AOC Advice of Charge (I.256 B)
AP Application (OSI Layer 7)
APD Avalanche Photo Diode
API Application Interface
APPC Advanced Program to Program Communication (IBM)
AR Activation Request (C/I channel code)
ARCOFI Audio Ringing Codec Filter PSB2160
ARCOFI-SP ARCOFI + speakerphone function PSB2165
ARCOS ARCOFI Coefficient Support Program
ARCOTI SIPB Telephone Module
ARD AR Downstream
ARL Activation Request Local loop (C/I channel code)
ARM Activation Request Maintenance (C/I channel code)
ARM Asynchronous Response Mode
ARN Activation Request
ARQ Automatic Repeat Request
ARU Activation Request Upstream
ASCC2 Advanced Serial Communication Controller SAB825??
ASCII American Ntl. Standard Code for Information Interchange
ASE Application Service Element
ASIC Application Specific Integrated Circuit
ASM Analog Subscriber Module
ASP ARCOFI Signal Processor
AT&T American Telephone & Telegraph
ATD Async. TDM
ATI Awake TI
ATM Analog Trunk Module
ATM Asynchronous Transfer Mode
AU Access Unit
AUP Access Unit Port
AW (Ger) termination resistor
AWI Awake Indication
B8ZS Bipolar with 8 Zeros Substitution (T1 PRI)
BA Basic Access
BAKT (Ger) Basic Access Concentrator
BAMX (Ger) Basic Access MUX
BAS Basic Activity Subset (T.62, BAS of OSI session layer)
BBD0/1 Binary 0s or 1s detected in B and D channels
BCC Block Check Character
BCCP Bearer CCP
BDS Basic Data Service
BEL Bell
BER Bit Error Rate
BHC Busy Hour Call
BIB Backward Indicator Bit (SS7)
BICU Bus Interface Control Unit
BIFIFO Bidirectional FIFO
BIR Bit Receiver
BIR Bus Interface Register
BISDN Broadband ISDN
BISYNC Binary Synchronous Communications
BIT Bit Transmitter
BITR Bit Transceiver
BLA Blocking Acknowledgement (SS7: in ISUP)
BLO Blocking (SS7: in ISUP)
BMU Basic Measurement Unit (DIP)
BOC Bell Operating Companies
BORSCHT Battery, Overvoltage, Ringing, Supervision, Coding, Hybrid, Testing
BOP Byte Oriented Protocol
BOS Bit Oriented Signaling
BPSK Binary PSK
BR Bit Robbing (CAS-BR)
BRG Baud Rate Generator
BS Backspace
BSI British Standards Institution
BSN Backward Sequence Number (SS7)
BT British Telecom
BVS Basic Voice Service
C/I Command/Indicate
CA Collision Avoidance (->CSMA/)
CAM Communication Access Method
CAM Computer Aided Manufacturing
CAM Content Adressable Memory
CAM Control Administration Module
CAN Cancel
CANC Cancel (I.451)
CAS Cannel Associated Signaling
CBA Change Back Acknowledgement (SS7: in MTP)
CBD Change Back Declaration (SS7: in MTP)
CBEMA Computer and Business Equipment Manufacturers' Assc.
CC Common Channel (CAS-CC)
CC Connection Confirm
CC Country Code (ISO 7498)
CC1 Call Control 1 (IOS)
CCA Computer Content Architecture (ISO 8637/2)
CCBS Completion of Call to Busy Subscribers (I.253 C)
CCIR Consultative Committee for Radiocomunication
(International Radio Consultative Committee)
CCIS #7 Common Channel Interoffice Signaling (Japan, SS #7 Subset)
CCITT Consultative Committee for Internat. Telephone and Telegraph
CCNC CCS Network Control
CCP Call Control Part
CCR Clock Configuration Register
CCR Continuity Check Request (SS7: in ISUP)
CCRC Corrupt CRC (IOM2 Monitor Command)
CCS Common Channel Signaling
CCU Communication Control Unit
CD Call Deflection (I.252 E)
CD Collision Detection (->CSMA/)
CDI Connected Line Identification (I.251 C/E)
CDMA Code Division MA
CDR Collision Detect input line
CE Conducted Emission (EME)
CE Collision Elimination (->CSMA/)
CEI Comparable Efficient Interconnection
CEN European Committee of Standards
CENELEC European Committee of Standards (Electrotechnics)
CEP Connection Endpoint
CEPT European Conference of Post/Telecom Administrations
CFI Configurable Interface (SIPB)
CFNR Call Forwarding No Reply (I.252 C)
CFP Call Forwarding Busy (I.252 B)
CFU Call Forwarding Unconditional (I.252 D)
CGB Circuit Group Blocking (SS7: in ISUP)
CGBA CGB Acknowledgement
CGM Computer Graphics Metafile (ISO DIS 8632)
CGU Circuit Group Unblocking (SS7: in ISUP)
CGUA CGU Acknowledgement
CIF Common Intermediate Format (for ISDN high end video)
CIC Circuit Identification Code
CID Connection Identification
CIP Control Interface Port
CIP Control Interface Port
CIRR C/I Receive Register
CIXR C/I Transmit Register
CK Checkbits
CKS Clock select bit
CLIP Calling Line Identification Presentation (I.251 C)
CLIR Calling Line Identification Restriction (I.251 D)
CLK Clock
CLS Connectless-Mode Service
CLT Communications Line Terminal
CM Connection Memory
CMC Call Modification Completed (SS7: in ISUP)
CMR Call Modification Request (SS7: in ISUP)
CMRJ CMR reject (SS7: in ISUP)
CN Connection
CO Central Office
COA Change Over Acknowledgement (SS7: in MTP)
COO Change Over Order (SS7: in MTP)
CODEC Coder/Decoder
COLP Connected Line Identification Presentation (I.251 E)
COLR Connected Line Identification Restriction (I.251 F)
COM/EXP PCM-Compander/Expander
CONF Conference Calling (I.254 A)
CONN Connect Msg. (I.451)
COP Call Offering Procedure
CORC Commands and Responses Definition and Compressing Program (IOS)
CorNet Corporate Network Protocol (ECMA and CCITT Q.930/931 oriented)
D-channel layer 3 protocol for private IPABX
COS Connection-Mode Service
COT Central Office Terminal (opposite to RT)
COT Continuity (SS7: in ISUP)
CPD Common Packet Data Channels
CPE Customer Premises Equipment
CPG Call Progress (SS7: in ISUP)
CPU Central Processing Unit SAB80188-2
SAB80C166
SAB80C5xx
CQM Circuit Group Query (SS7: in ISUP)
CQR CQM Response
CR Carriage Return
CR Control Response
CRC Cyclic Redundancy Check
CRCOK CRC ok! (C/I channel code)
CRED Credit Card Calling (I.256 A)
CREF Connection Refused
CS Cable Switching
CS Conducted Susceptibility (EMS)
CSMA/ Carrier Sense Multiple Access
CSO Cold Start Only (in EOC)
CSDN Circuit-Switched Data Network (T.70)
CSPDN Circuit-Switched Public Data Network
CSR Clock Shift Register
CST Call State or Current State or Change State (quasi SDL)
CT Call Transfer (I.252 A)
CTMC Communications Terminal Module Controller
CTS Clear to Send
CUG Closed User Group (I.255 A)
CW Call Waiting (I.253 A)
D-CTL D Channel Controller (IDEC)
DAC Digital to Analog Converter
DACOM Data Communictions Corp. of Korea (ROK)
DACK DMA ACK
DAEDR Delimitation, Alignment and Error Detection Procedure
in Receive Direction
DAML Digital Added Main Line (pair gain)
DAP Document Application Profile
DASS2 Digital Access Signaling System 2 (BT, DPNSS subset)
DBCS Data Bank Control System
DBOS Data Bank Organization System
DBSS Data Bank Security System
DBP (Ger) German Federal Post
DC Device Cinfirmation (C/I channel code)
DCn Device Control n
DCC Data Country Code (ISO 7498)
DCE Data Circuit-terminating Equipment
DCE Data Communications Equipment
DCH D-Channel Handling bit
DCL Data Clock (i.e. IOM2)
DCME Digital Circuit Multiplexing Equipment
DCS Data Communications Subsystem
DD Data Downstream (i.e. IOM2)
DDI Direct Dialing-In (I.251 A)
DDN Defense Data Network
DDS Dataphone Digital Service
DDX Digital Data Exchange
DEAC Deactivation (C/I channel code)
DECT Digital European Cellular Phone
DEE (Ger) data terminal
DEL Delete
DET Detatch Msg. (I.451)
DI Deactivation Indication (C/I channel code)
DIA Document Interchange Architecture
DIC Digital Concentrator
DID DI Downstream
DID Direct Inward Dialing
DIF Digital Interface
DIGON (Ger) digital local network (Berlin)
DIP Document Interchange Protocol (lower sublayer of OSI layer 6)
DIR Direction
DIS Disconnect
DISC Disconnect (LAP-D Command, I.451)
DISD Direct Inward Subscriber Access
DIU Deactivate Indication
DIU Digital Interface Unit
DIV (Ger) digital exchange
DIVF (Ger) DIV for long distance service
DIVO (Ger) DIV for local service
DL5MDA someone who collects each ISDN abbrevation crossing his way
DLAB Divisor Latch Access Bit
DLC Data Link Control
DLCI Data Link Connection Identifier (I.440: SAPI+TEI)
DLE Data Link Escape (ASCII Control)
DLE Delete
DLS Digital Line Section
DLUC Digital Line Unit Control
DM Disconnected Mode (LAP-D Response)
DMA Direct Memory Access
DNHR Dynamic Nonhierarchical Routing
DNIC Data Network Identification Code (ISO 7498)
DOD (USA) Dept. of Defense
DPC Destination Point Code (SS7)
DPCM Differential PCM
DPLL Digital Phase Locked Loop
DPNSS Digital Private Network Signaling System (BT)
DPSK Differential Phase Shift Keying
DR Deactivate Request (C/I channel code)
DRAM Dynamic RAM
DRCS Dynamically Redefinable Character Sets
DR Deactivation Request
DRE Direction
DSC Digital Subscriber Controller Am79C30A
DSGLA (Ger) DLS
DSI Digital Speech Interpolation
DSM Digital Switching Module
DSMX (Ger) digital signal multiplexer
DSP Digital Signal Processing
DSP Domain Specific Part (ISO 7498)
DSR Data Set Ready
DSU Data Servicing Unit
DT Data Through (C/I channel code in test mode)
DT1 Data Form Class 1
DTAM Document Transfer Access and Manipulation
DTC Digital Telephone Controller (ARCOFI + IBC + ICC)
DTE Data Terminal Equipment
DTM Digital Trunk Module
DTMF Dual Tone Multi Frequency (Dial) PSB8593
DTR Data Terminal Ready
DU Data Upstream (i.e. IOM2)
DU Deactivation Request Upstream (C/I channel code)
DUP Data User Part
DVA (Ger) data processing equipment
DYRECT SIDES Dynamic Real Time Communication Tester
(in SITEST, tests IOS on Board)
EA Expedited Data Acknowledgement (SS7: in SCCP)
EA Extended Adress
EBCDIC Extended Binary Coded Decimal Interchange Code
EC Echo Canceller
EC European Community
ECL Emitter Coupled Logic
ECMA European Computer Manufactueres Association
EDI Electronic Data Interchange
EEPROM Electrically Erasable Programmable Read Only Memory
EIn Error Indication n (C/I channel code)
EM Encription Module
EM End of Medium (ASCII Control)
EMC Electromagnetic Compatibility
EME Electromagnetic Emission
EMI Electromagnetic Interference
EMS Electromagnetic Susceptibility
EMV EMC (German)
ENQ Enquiry
EO End Office
EOC Embedded Operation Channel
EOM End of Message
EP Expedited Data (SS7: in SCCP)
EPIC Extended PIC PEB2055
EQ Equalizer
ERC Error Control (IOS)
ESC Enhanced Speech Circuit PSB4505/6
ESC Escape (ASCII Control)
ESCC2 Extended high level Serial Communication Controller SAB82532
(2 channel multi protocol controller)
ESCC8 like ESCC2, but 8 channels SAB82538
ESF Extended Super Frame
EST established
ET Exchange Termination
ETB End of Transmission Block
ETRI Electronics and Telecommunications
Research Institute (ROK)
ETX End of Text
EVST (Ger) end exchange
EWSD (Ger) electronic dialing system (Digital)
FA Frame Aligner
FAA Facility Accepted (SS7: in ISUP)
FAC Facility
FACD Facility Changed Msg.
FAR Facility Request (SS7: in ISUP)
FAS Frame Alignment Signal
FAX Faximile
FC Feature Control
FC Frame Control
FCC Federal Communications Comission (USA)
FCS Frame Check Sequence
FDDI Fiber Distributed Data Interface (X3T9.5)
FDM Frequency Division Multiplex
FDMA FDM Access
FEBE Far End Block Error (IOM2 Monitor Message)
FEC Forward Error Correction
FECC Front End Communication Computer
FF Form Feed
FIB Forward Indication Bit (SS7)
FIFO First In First Out (storage)
FIN Facility Information Msg.
FISU Fill In Signal Unit (SS7)
FJ Frame Jump (C/I channel code)
FM Frequency Modulation
FMM Finite Message Machine
FNBE Far and Near end Block Error (IOM2 Monitor Message)
FOT Forward Transfer (SS7: in ISUP)
FP Functional Protocol
FPC Frequency Comparison Pilots
FPS Fast Packet Switching
FRAC Frame Aligner Circuit PEB2030
FRJ Facility Rejected Msg. (SS7: in ISUP)
FRMR Frame Reject (LAP-D Response)
FRQ Facility Request Message
FS File Separator
FSC Frame Synchronization Clock (i.e. IOM2)
FSN Forward Sequence Number
FTP File Transfer Protocol (DOD)
FTZ (Ger) Central Telecom Technical Office (of DBP)
GAP (EC) Group of Analysis and Provision (for ONP)
GB Great Britain
GC Group Card
GCI General Circuit Interface (IOM/U(k0)-Interface)
GCR General Configuration Register
Ger German
GP Group Processor
GPPC General Purpose Power Controller PSB2121
GPS Global Positioning System
GRA GRS Acknowledgement
GRS Circuit Group Reset (SS7: in ISUP)
GS Group Separator
GTEI Global TEI
GWY Gateway
H Hold state (in EOC)
H- High-
HAC Hands-Free Add-On Circuit (for speakerphone) PSB45030
HDB3 High-Density Bipolar 3 (CEPT PRI)
HDLC High Level DLC
HDTV High Definition TV
HFR Hardwara Failure Rate
HI High Impedance (C/I channel code)
HI Highway Interrupt
HL IT Siemens Semiconductors (HL), Info Technics (IT)
HOLD Call Hold (I.253 B)
HSCC High Level Serial Communication Controller SAB82520
HSCX extended HSCC SAB82525
HT Horizontal Tabulator
HTI Highway Transfer Interrupt
HU High-Usage trunk
HW PCM Highway
I Information (LAP-D Command)
I- Information (numbered I-Frames)
I/O Input/Output
IAM Initial Address Msg. (SS7: in ISUP)
IBC ISDN Burst Transceiver Circuit PEB2095
IBFN (Ger) integrated high bandwith long distance network
IC Incoming Call (X.25)
ICOM (Taiwan) Integrated Communication
ICAO International Civil Aviation Organization
ICC ISDN Communications Controller PEB2070
IDA (GB) Interated Digital Access (B64+B8+D8)
IDEC ISDN D-channel Exchange Controller PEB2075
IDI Initial Domain Identifier (ISO 7498)
IDN (Ger) integrated data network
IDPC Integrated Data Protocol Controller SAB79C401
IEC International Electrotechnical Comission
IEC ISDN Echo Cancellation Circuit
IEC-T IEC for 4B3T PEB2090
IEC-Q1 IEC for 2B1Q PEB2091
IEC-Q2 IEC-Q specially for LT and NT1 (without microprocessor) PEB2092
IEC-Q3 IEC-Q with parallel processor interface (i.e. for DAML) PEB2093
IEC-P (old name of IEC-Q3)
IEPC ISDN Exchange Power Controller PEB2025
IFRB International Frecuency Registration Board
IFS (Switzerland) integrated telecom service
IGS Idenitfy Graphic Subrepertoire (Teletex)
IKZ (Ger) pulse dial
ILC ISDN Link Controller
IM Input MUX
IMC IOS Mailbox Control
IMMU IOS Memory Management Unit
IMP Interpersonal Messaging Protocol (X.420: P2)
INF Information (SS7: in ISUP)
INR Information Request (SS7: in ISUP)
INS (Japan) Information Network System (B64+B16+D8)
INT Interrupt (i.e. C/I channel code)
IOC Integrated Optical Circuit
IOM ISDN-Oriented Modular (Architecture and Interfaces)
IOM2 extended IOM
IOS ISDN Operational Software SIPB6013
IP Intermediate Point
IP Internet Protocol (TCP/IP, DOD)
IPABX ISDN PABX
IPAC ISDN PC Adapter Circuit PEB21??
IPAT ISDN Primary Access Transceiver PEB2235
IPB SIPB
IPBC IOM2 PBC (old name for EPIC)
IPC Interprocess Communication
IPCS IOS Process Control System
IPP IOS Protocol Part
IRPC ISDN Remote Power Control PSB2120
ISAC-P ISDN Subscriber Access Controller (S Bus, PABX, U) PEB20950
ISAC-S ISDN Subscriber Access Controller (S Interface ICC+SBC) PEB2085
ISDN Integrated Services Digital Network
ISM ISDN Switching Module
ISO International Organization for Standardization
ISP Intermediate Service Part
ISPC International Signaling Point Code (SS7)
ISPBX Integrated Systems PBX
ISSS ISDN Supporting System
ISTA Interrupt Status Register
ISUP ISDN User Part (SS7: Q.76X)
IT Inactivity Test (SS7: in SCCP)
ITAC ISDN Terminal Adaptor Circuit PEB2110
ITSTC Information Technology Steering Committee
(CEN, CENELEC, CEPT)
ITU International Telecommunication Union
IVD Integrated Voice Data
IWF Interworking Facility (Gateway)
IWU Interworking Unit (Gateway)
JDC Japan Digital Cellular
KTA Korea Telecommunication Authority (ROK)
KVST (Ger) node exchange
KZU (Ger) signaling converter
L3-ERC Layer 3 Error Control (IOS)
L3M Layer 3 Mgr. (IOS)
LAN Local Area Network
LAPB (LAP-B) Link Access Procedure of Balanced Mode
LAPD (LAP-D) Link Access Procedure of D-Channels
LAPM (LAP-M) Link Access Protocol for Modems
LAPX LAPB extended (T.71, for half duplex teleservice)
LATA Local Access and Transport Areas
LBBD Loopback B1, B2 and D channel request
(Command in IOM2 Monitor and EOC)
LBn Loopback channel Bn request
(Command in IOM2 Monitor and EOC)
LC Line Card
LCN Logical Channel Number
LCS7 Link Controller for Signaling System No.7 PEB3040
(layer 2, CCITT Q.703, upgraded HSCX, pin compatible)
LE Local Exchange (contains D-CTL)
LF Line Feed
LH Line Hunting (I.252 F)
LI Length Indicator (SS7)
LIU Line Interface Unit
LL Logical Link
LLC Low Level Controller SIPx6100
LLD Low Level Device Drivers (IOS)
LLID LL Identifier
LLL Last Look Logic
LLP Link Layer Protocol (LAPD)
LNA Low Noise Amplifier
LOF Loss of Frame
LRC Longitudinal Redundancy Check
LRN Local Reference Number
LSEC Loss of SEC (C/I channel code)
LSL Loss of Signal Level (C/I channel code)
LSSU Link State Signal Unit (SS7)
LSU Loss of Signal level of U interface (C/I channel code)
LSUE LSU Error condition (C/I channel code)
LT Line Termination
LT-S LT on S bus
LT-T LT on T interface
LTD LT Disable (C/I channel code)
LTG Line Trunk Group
LTU Line Trunk Unit
LTUC LTU Control
LU 6.2 protocol for APPC
LWL (Ger) OFT
MA Multiple Access (Primary)
MAP Manufacturing Automation Protocol
MAP Mobile Application Part
MCI Malicious Call Identification (I.251 G)
MDF Main Distribution Frame
MF Mainboard Firmware (IOS)
MF Multi Frame
MFJ Modification of Final Judgement
MFC Multiple Frame operation Control (IOS)
MH Modified Huffman code (FAX)
MHS Message Handling Service
MIP Microprocessor Interface Port
MIPS Million Instructions per Second
MML Man Machine Language
MMS43 Modified Monitoring State 43 Code (4B3T)
MMU Memory Management Unit (IOS)
MNP Microcom Networking Protocol
MOC Ministery of Communication
MOD Ministery of Defense
MON Monitor Channel (i.e. IOM2)
MP Microprocessor
MPC MP Command
MPDU Message Protocpl Data Units (X.411)
MR Modified READ (Relative element address designate, FAX)
MR Monitor Read (flow control bit in IOM2)
MS Menue Software (SIPB.EXE)
Msg Message
MSN Multiple Subscriber Number (I.251 B)
MSU Msg. Signal Unit (SS7)
MTA Message Transfer Agent (X.400)
MTAE Message Transfer Agent Entity (X.400)
MTP Message Transfer Part (SS7: Q.701-Q.710)
MTP Message Transfer Protocol (X.411: P1)
MTS Memory Time Swich PEB2040
MTSC MTS CMOS (512 incoming channels) PEB2045
MTSL MTS Large (1024 incoming channels) PEB2047
MTSS MTS Small (256 incoming channels) PEB2046
MUNICH Multichannel (32) Network Interface Controller SAB20320
MUSAC Multipoint Switching and Conferencing Unit PEB2245
MUX Multiplexer
MW (Ger) service word
MX Monitor Transmit (flow control bit in IOM2)
N(R) (NR) Receive Sequence Number
N(S) (NS) Transmit Sequence Number
NAK Negative Acknowledge
NB Narrow Band
NCC Notify Corrupted CRC (in EOC)
NCU Network Control Unit
NCP Network Control Point (in a SDN)
NCTE Network Channel Terminating Equipment (FCC: NT1)
NDC National Destination Code (i.e. area code)
NDU Network Data Unit
NEBE Near End Block Error (IOM2 Monitor Message)
NET (EC) European standards of telecommunication
NF (Ger) low frequency
NFS Network File System
NFT Network File Transfer
NLP Network Layer Protocol
NORM return to Normal (IOM2 Monitor Command/Message)
NRM Normal Response Mode (HSCX)
NRZ Non Return to Zero
NRZC NRZ Change
NRZI NRZ Inverted
NRZM NRZ Mark
NSP Network Service Part (SS7: SCCP+MTP)
NStA (Ger) PBX
NT Network Termination
NT1 NT serving Layer 1 (NCTE, network interface of NT,
between reference points T and U)
NT2 NT serving Layer 1 to 3 (subscriber interface of NT,
between reference points S and T)
NT/S NT Simulator SIPB7020
NTM NT Test Mode (IOM2 Monitor Message)
NUC Nailed-up Connection
NUA (international) Network User Address
NUI Network User Identification
NUL Null
NUP National User Part
NVM Non Volatile Memory (EEPROM)
NWI Network Interface
OA&M Operations, Administration & Maintenance (SS7: Q.79X)
OC Office Communication
OCP Origination Point Code (SS7)
ODA Office Document Architecture
OEIC Optoelectronic Integrated Circiut
OFT Optical Fiber Tube
OM Output MUX
OMAP Operations and Maintanance Application Part
OMC Operating and Maintainance center
ONA Open Network Architecture (FCC: Computer Inquiry III)
ONP Open Network Provision
OPC Originating Point Code
OPDU Operations Protocol Data Unit (X.411: P3)
OSI Open Systems Interconnection
OVST (Ger) local exchange
OWG Optical Wave Guide
P/F Poll/Final Bit
PABX Private Automatic Branch Exchange
PAD Packet Assembly/Disassembly Device
PAM Pass Along Method (SS7: in ISUP)
PAM Primary Access Method
PAS Protocol Architecture Specification for IOS (PCT)
PBC Peripheral Board Controller PEB2050/51
PBX Private Branch Exchange
PC Power Controller
PC Primary Center
PCL PCM data Clock
PCM Pulse Code Modulation
PCN Personal Communication Network (UK, mobile comm.)
PCR Preventive Cyclic Retransmission (SS7: in MTP)
PCSN Public Circuit Switched Network (?)
PCT IOS Program Coding Tools (SDL oriented) SIPO6021
PDC Primary Digital Carrier
PDM Power Down Mode
PDU Protocol Data Unit (X.400)
PDN Public Data Network
PFOFF Power Feed OFF (C/I channel code)
PFS Page Format Selection (Teletex)
PFS PCM Frame Synchronisation Signal
PH Packet Handler
PH- Physical-
PIC PCM Interface Controller PEB2052
PIOCS Physical I/O System
PIP PCM Interface Port
PIU PCM Interface Unit
PKT Packet
PLC Physical Link Control (IOS)
PLD Partial Line Down (Teletex)
PLIC PCM Line Interface
PLL Phase Locked Loop
PLU Partial Line Up (Teletex)
PM Phase Modulation
PN Pseudo Noise (Code)
PNP Private Numbering Plan (I.255 B)
PPU Power Providing Unit
PRI Primary Rate Interface
PS Packet Switching
PSDN Packed-Switched Data Network (T.70)
PSF Packet Switching Facility
PSK Phase Shift Keying
PSL IOS Protocol Source Library
PSPDN Packed-Switched Public Data Network
PSR Phase Shift Register
PST SIDES Protocol Software Development
PSTN Public Switched Telephone Network (T.70)
PU Power Up (C/I channel code)
PUM PU Mode
PVC Permanent Virtual Circuit
Q-CIF Quarter CIF (for ISDN low end video)
QSC Quad S Interface Circuit PEB2084
QTAM Queued Telecom Access Method
RA Rate Adaption
RAD Receive Adress
RAM Random Access Memory
RBEF Read Block Error counter for Far end (IOM2 Monitor Command)
RBEN Read Block Error counter for Near end (IOM2 Monitor Command)
RBOC Regional BOC
RC Regional Center
RCC Request Corrupted CRC (in EOC)
RCL Route Clock
RCI Read Controller Interface (IOM2 Monitor Command)
RCP Remote Copy
RCRE Receive Corrected Reference Equivalent
RCU Repeater Control Unit (i.e. ASIC between two IEC-Q2s)
RDS Running Digital Sum
RDY Resynchonisation indication after loss of framing
(C/I channel code)
RE Radiated Emission (EME)
REC Receiver
REJ Reject (LAP-D Command/Response, I.451)
REL Release (I.451)
RES Reset (C/I channel code)
RES Resume (I.451)
RES1 Reset receiver (C/I channel code)
REMSH Remote Shell
REV Reverse Charging (I.256 C)
RFI Radio Frequency Interference
RID Read Identification (IOM2 Monitor Command)
RKW (Ger PCM30) FAS
RL Return Loss
RLC Release Complete Msg. (SS7: in SCCP)
RLOGIN Remote Login
RLSD Released Msg. (SS7: in SCCP)
RNR Receive Not Ready (LAP-D Command/Response)
ROK Republic of Korea
ROSE Remote Operation Service Element (TCAP subset)
RP Repeater
RPFC Read Power Feed Current value (IOM2 Monitor Command)
RPOA Recognized Private Operating Agency
RR Receive Ready (LAP-D Command/Response)
RS Radiated Susceptibiltiy (EMS)
RS Record Separator (ASCII Control)
RS Reset
RSC Reset Confirm (SS7: in SCCP and ISUP)
RSY Resynchronizing (C/I channel code)
RSYD RSY Downstream
RSYU RSY Upstream
RT Remote Terminal (opposite to COT)
RTB Retransmission Buffer
RTCA Radio Technical Commission of Aeronautics
RTN Return to Normal (in EOC)
RTS Request to Send
RTSE Reliable Transfer Service Element
RxSD Receive Serial Data
RZ Return to Zero (-> NRZ)
S- Supervisory (S-Frames)
SAA System Applications Architecture (for PS/2)
SABME Set Asynchronous Balanced Mode (ABM) Extended (LAP-D Command)
SAC Service Access Connector (-> SIPB)
SAI S Activity Indicator (in EOC)
SAM Subsequent Address Msg. (SS7: in ISUP)
SANE Signaling Area/Network Code (SS7)
SAP Service Access Point
SAPI Service Access Point Identifier
SAW Surface Acoustic Wafe (Filter) B5534
SBC S Bus Interface Circuit PEB2080
SBCX SBC extended PEB2081
SBUC S Bus Connector
SC Sectional Center
SCCP Signaling CCP (SS7: Q.71X)
SCL Station Clock
SCLK Slave CLK
SCM Scramble Coder Multiplexer
SCP Service Control Point
SCR Signaling Configuration Register
SCRC Send Corrected Reference Equivalent
SD Slip Detected
SDE Submission/Delivery Entity (X.400)
SDL Specification and Description Language
SDLC Synchronous DLC
SDM Space Division Multiplex
SDN Software Defined Network
SDP Submission and Delivery Protocol (X.411)
SDT Software Development Tools
SEC Signal level behind the Echo Canceller (C/I channel code)
SEL digital Selector (in TMS)
SF Service Field
SF Status Field (SS7)
SFB Set next FEBE to zero
SFD Superframe Detected (C/I channel code)
SGC Switching Group Control
SGH Select Graphic Rendition (Teletex)
SHI Select Horizontal Spacing (Teletex)
SI Sequenced Information
SI Service Indicator
SI Shift In (ASCII Control)
SICOFI Signal Processing Codec Filter PEB2060
SICOFI2 2 channel SICOFI PEB2260
SIDES Siemens ISDN Software Development and Evaluation System
SIF Signaling Information Field (SS7)
SIG Signaling equipment (in a trunk)
SIGS Signaling Strobe
SIN Status Indication Normal Alignment
SIO Service Information Octet (SS7)
SIP Serial Interface Port
SIPB Siemens ISDN PC User Board
SIPB 5XXX SIPB Modules
SIPB 7XXX SIPB Configurations
SIPMOS Siemens P MOS BUZ...
BSS...
BSP...
SIPO 6XXX Siemens ISDN PC Software Object Code
SIPS 6XXX Siemens ISDN PC Software Source Code
SITAC Siemens Isolated Thyristor AC
SITEST Siemens ISDN Protocol Software Test Tools SIPO6022
SIU Subscriber Line Interface Unit
SL Subscriber Line
SLA Subscriber Line Adress
SLC Signaling Link Code (SS7)
SLD Subscriber Line Data (Bus)
SLIC Subscriber Line Interface Circuit
SLM Subscriber Line Module
SLMA SLM Analog
SLMD SLM Digital
SLS Signaling Link Selection (SS7)
SM Service Module
SM Speech Memory
SMD Surface Mounted Device
SMF Sub Multi Frame
SMS Service Management System
SMTP Simple Mail Transfer Protocol
SNA System Network Architecture (IBM)
SO Shift Out
SOH Start of Header
SP (Ger) storage
SP Signal Point (Switching Office in SS7)
SP Stimulus Protocol
SPC Signaling Poiny Code (SS7)
SPC Stored Program Controlled
SPCR Serial Port Control Register
SQD Signal Quality Detector
SRAM Static RAM
SS7 Signaling System #7 (CCITT)
SSC Standard Speech Circuit PSB4500/-1
SSF Sub Service Field
SSI Serial Signal Interface
SSN Subsystem Number
SSP Send Single Pulses (C/I channel code for test mode)
SSP Service Switching Point
ST Self Test request NT (IOM2 Monitor Message)
ST Subscriber Terminal
STP Self Test Pass (IOM2 Monitor Message)
STATMUX Statistical Multiplexer
STCR Syncron Transfer Control Register
STEP SIDES Static Test of IOS and MF on board (in SITEST)
STM Synchronous Transfer Mode
STORY Screening Tool for Report Files (IOS)
STP Signal Transfer Point (SS7)
STS Space-Time-Space switch (TMS-TSI-TMS)
STS Steered Tenant Service
STS 2060 SICOFI software
STU 2000 stand alone ISDN user board
STU 2040 stand alone MTS user board
STU 2050 stand alone PBC user board
STU 2060 stand alone SICOF user board
STUDIALO PC Software for STU 2XXX
STX Start of Test
SU Signaling Unit
SUB Sub-addressing (I.251)
SUB Substitute Character (Teletex)
SUERM SU Error Rate Monitor
SUS Suspend (SS7: in ISUP)
SUSP Suspend (I.451)
SVC Switched Virtual Circuit
SVM Service Module
SVP Surge Voltage Protector various
SVS Select Vertical Spacing (Teletex)
SWFC Sliding-Window Flow Control
SYN Synchronous Idle
SYP Synchronisation Pulse
T double wire pair
T- Transportfunction-
T&R two wire phone connection
TA Terminal Adaption
TAC TEI Assignment Control (IOS)
TAC Technical Assistance Center
TAP Teletex Access Protocol (X.430: P5)
TC Toll Center
TC Transaction Capabilities
TCAP Transaction Capabilities Application Part
TCM Time Compression Multiplexing
(also "ping pong" or "burst" transmission, used in IBC)
TCP Transport Control Protocol (DOD, IP)
TCU Timing Control Unit
TDC Telex Destination Code (ISO 7498)
TDM Time Division Multiplex
TDMA TDM Access
TE Terminal Equipment
TE Transit Exchange (contains PSF)
TEI Terminal Endpoint Identifier
TELEKOM (Ger) telecom division of DBP
TELEX Teleprinter Exchange
TELNET virtual terminal protocol
TF (Ger) carrier frequency
THL Trans Hybrid Loss
TI Test Indication
TIC Telecom IC (IOM-Bus)
TIM Timing
TKO (Ger) telecom regulations
TM Testmode
TM Trasfer Modus
TM1 Terminal 1 (IOS)
TMA Trunk Module Analog
TMD Trunk Module Digital
TMS Time-Multiplexed Switching
TMX Trunk Module with X-interface
TN Tone (C/I channel code: wake up signal)
TNC Terminal Node Controller
TOP Technical Office Protocol
TOPQ Top of Queue (quasi SDL)
TRI Tone Ringer PSB652x
TS Time Slot
TSA Time Slot Assignment
TSC Tristate Control
TSI Time-Slot Interchange
TST Time-Space-Time switch (TSI-TMS-TSI)
TUP Telephone User Part (SS7: Q.72X)
TWX Teletype Writer Exchange
TxSD Transmit Serial Data
U single wire pair
U- Unnumbered (U-Frames)
U(k0) (Ger) U0 echo cancellation Interface
U(p0) (Ger) U0 burst mode Interface
UA Unnumbered ACK (LAP-D Response)
UA User Agent (X.400)
UAE User Application Entity or User Agent Entity (X.400)
UAI U Activation Indication (C/I channel code)
UBA Unblocking Acknowledgement
UBL Unblocling (SS7: in ISUP)
UDLC Universal DLC
UDT Unidata (SS7: in SCCP)
UDTS Unidata Servive (SS7: in SCCP)
UDP User Datagram Protocol
UI Unnumbered Information (LAP-D Command)
UIC U-Interface Unit
ULCU User Level Control/Command Unit
UOA U Interface Only Activation (in EOC)
UP User Part
US Unit Separator
USART Universal Synchrounous/Asynchrounous Receiver/Transmitter
USR User-to-User Information (SS7: in ISUP)
UTC Unable to Comply Ack (in EOC)
UTC Unacknowledged (Unnumbered) Information Transfer Control (IOS)
UTM Universal Transaction Monitor
UUCP Unix-System to Unix-System Copy
UUS User-to-User Signaling (I.257 A)
V(R) Receive Sequence Counter
V(S) Transmit Sequence Counter
VAC Vacuumschmelze (produces cores and transformers)
VANS Value Added Network Service
VAP Value Added Process
VAP Videotext Access Point
VC Virtual Call
VCB Virtual Circuit Bearer
VFAC Verified and Forced Account Codes
VFN Vendor Feature Node
VHDL Very High Scale IC Description Language (DOD)
VL (Ger) connecting cable
VPT Virtual Private Network
VSAT Very Small Aperture Terminal (for satellite communication)
VSP (Ger) full frame storage
VSt (Ger) exchange unit
VT Vertical Tabulator
VT Virtual Terminal
VTAM Virtual Telecom Access Method
WADS Wide Area Data Service
WATS Wide Area Telephone Service
WCI Write Controller Interface (IOM2 Monitor Command)
WDFHP recursive high pass filter + decimation filter
WDFLP recursive low pass filter + decimation filter
WDM Wavelength Division Multiplex
XAD Transmit Adress
XFIFO Transmit FIFO
XID Exchange Identification (LAP-D Command/Response)
XOFF Transmission Off (DC1)
XON Transmission On (DC3)
XPL Cross Reference Protocol Listing (PCT)
ZCS Zero Code Suppression
ZSP (Ger) intermediate (buffer) storage
ZWR (Ger) intermediate regenerator
ZZF (Ger) central office for approvals in telecommunications (DBP)
ZZK (Ger) central signaling channel
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