Received: from hub.eecs.nwu.edu by gaak.LCS.MIT.EDU via TCP with SMTP id AA27988; Sun, 27 Jan 91 14:39:59 EST Resent-Message-Id: <9101271939.AA27988@gaak.LCS.MIT.EDU> Received: from labrea.Stanford.EDU by delta.eecs.nwu.edu id aa18840; 27 Jan 91 6:29 CST Received: by labrea.stanford.edu; Sun, 27 Jan 91 04:17:17 PST Date: Sun, 27 Jan 91 04:17:17 PST From: cdp!anlyyao@labrea.stanford.edu Message-Id: <9101271217.AA10499@labrea.stanford.edu> To: telecom@eecs.nwu.edu Subject: comp.dcom.tele: Abbrevations for ISDN & Telecom Resent-Date: Sun, 27 Jan 91 13:41:16 CST Resent-From: telecom@eecs.nwu.edu Resent-To: ptownson@gaak.LCS.MIT.EDU Status: R ------------------------------------------------------------------------------ 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