Today all people directly or indirectly connected with telecommunications. Through this telecommunication system, we can send information such as audio, video, messages from one device to another. In this telecommunications system, information is transmitted from one device to another in the form of electromagnetic signals known as carrier waves. Telecom is a universal word that comes from telecommunications. Today all people around the world are connected to each other through this telecommunications system.
Now we will discuss different types of Telecommunications related abbreviation or full form which are very important for everyone.
| No. | Acronym | Full Form |
|---|---|---|
| 1 | GSM | Global System for Mobile(Communication) |
| 2 | GPRS | General Packet Radio Service |
| 3 | NAP | Network Access Point |
| 4 | ISD | International Subscriber Dialing |
| 5 | CDMA | Code Division Multiple Access |
| 6 | BSC | Base Station Controller |
| 7 | RFT | Radio Frequency Transmitter |
| 8 | GEO | Geostationary Earth Orbit |
| 9 | DSS | Direct Satellite Services |
| 10 | SDLC | Synchronous Data Link Control |
| 11 | IMSI | International Mobile Subscriber Identity |
| 12 | SMSC | Gateway Mobile Switching Center |
| 13 | DTA | Data Transfer Adapter |
| 14 | DTC | Digital Traffic Channel |
| 15 | IVRS | Interactive Voice Response System |
| 16 | CGSA | Cellular Geographic Service Areas |
| 17 | RNC | Radio Network Controller |
| 18 | NPDB | Number Portability Database |
| 19 | BFS | Broadcast File System |
| 20 | BGCF | Breakout Gateway Control Function |
| 21 | BGP | Border Gateway Protocol |
| 22 | BIU | Broadband Interface Unit |
| 23 | BRAS | Broadband Remote Access Server |
| 24 | BOPL | Broadband Over Power Line |
| 25 | BRI | Brand Rating Index |
| 26 | BRS | Broadband Radio Service |
| 27 | TMN | Telecommunication Management Network |
| 28 | UMTS | Universal Mobile Telecommunications System |
| 29 | FLAG | Fiber Link Around the Globe |
| 30 | VPS | Voice Processing System |
| 31 | DPCM | Differential Pulse Code Modulator |
| 32 | VMS | Voice Mail System |
| 33 | PAD | Packet Assembler And Disassembler |
| 34 | PCN | Personal Communications Network |
| 35 | VAC | Voltage Alternating Current |
| 36 | ATC | Alarm Traffic Controller |
| 37 | AFC | Automatic Frequency Control |
| 38 | PDC | Personal Digital Cellular |
| 39 | WAP | Wireless Application Protocol |
| 40 | WCDMA | Wideband Code Division Multiple Access |
| 41 | OMF | Object Management Framework |
| 42 | FM | Frequency Modulation |
| 43 | PCO | Public Call Office |
| 44 | FDM | Frequency Division Modulation |
| 45 | FSS | Fixed Satellite Service |
| 46 | LEO | Low Earth Orbit |
| 47 | MAP | Mobile Application Part |
| 48 | POTS | Plain Old Telephone Service |
| 49 | kHz | kilohertz (thousand hertz) |
| 50 | MHz | Megahertz (million hertz) |
| 51 | AVC | Advanced Video Coding |
| 52 | AVI | Advanced Video Interface |
| 53 | AWGN | Additive White Gaussian Noise |
| 54 | BDF | Broadband Digital Forward |
| 55 | BDR | Baseband Digital Reverse |
| 56 | BERT | Bit Error Rate Test |
| 57 | BMS | Business Management System |
| 58 | BPF | Band-Pass Filter |
| 59 | UPR | User Performance Requirements |
| 60 | GMRS | General Mobile Radio Service |
| 61 | SGSN | Serving GPRS Support Node |
| 62 | PDSN | Packet Data Switched Network |
| 63 | AUC | Authentication Center |
| 64 | PUK | PIN Unblocking Key |
| 65 | SIS | Subscriber Identity Security |
| 66 | SIM | Subscriber Identity Module |
| 67 | UMTS | Universal Mobile Telecommunication System |
| 68 | IMN | Intelligent Mobile Network |
| 69 | VLR | Visitor Location Register |
| 70 | BPI | Baseline Privacy Interface |
| 71 | DCF | Dispersion Compensating Fiber |
| 72 | DCR | Digital Cable Ready |
| 73 | CTO | Chief Technology Officer |
| 74 | ATM | Asynchronous Transfer Mode |
| 75 | ATM | Automated Teller Machine |
| 76 | DCP | Device Control Protocol |
| 77 | ACTS | Advanced Communication Technology Satellite (NASA) |
| 78 | CLASS | Custom Local Area Signaling Services |
| 79 | POC | Point Of Contact |
| 80 | DATE | Duly Authorized Telecommunications Entity |
| 81 | FOB | Free On Board |
| 82 | IF | Intermediate Frequency |
| 83 | BOD | Bandwidth on Demand |
| 84 | DID | Direct Inward Dialing |
| 85 | BOT | Build Operate Transfer |
| 86 | CAP | Competitive Access Provider |
| 87 | IN | Intelligent Network |
| 88 | CGI | Common Gateway Interface |
| 89 | FAT | Factory Acceptance Test |
| 90 | POM | Project Office Manager |
| 91 | POP | Point of Presence |
| 92 | COO | Chief Operating Officer |
| 93 | AMPS | Advanced Mobile Phones System |
| 94 | SDI | Secure Digital Interface |
| 95 | SRTP | Secure Real-time Transport Protocol |
| 96 | SSL | Secure Sockets Layer |
| 97 | TCAP | Transaction Capabilities Application Part |
| 98 | TCM | Tandem Connection Monitoring |
| 99 | UNI | User Network Interface |
| 100 | VPI | Virtual Path Identifier |
| 101 | WSS | Wavelength Selective Switch |
| 102 | VPLS | Virtual Private LAN Service |
| 103 | UPS | Uninterruptible Power Supply |
| 104 | TCO | Total Cost of Ownership |
| 105 | TCP | Transmission Control Protocol |
| 106 | SSM | Source Specific Multicast |
| 107 | SSMF | Standard Single Mode Fiber |
| 108 | SMF | Single Mode Fiber |
| 109 | SMS | Service Management System |
| 110 | SDMI | Secure Digital Music Initiative |
| 111 | SDP | Session Description Protocol |
| 112 | DBS | Direct Broadcast Satellite |
| 113 | DC | Direct Current |
| 114 | DCA | Digital Cable Application |
| 115 | CSS | Content Scrambling System |
| 116 | CSV | Comma Separated Value |
| 117 | BSS | Business Support System |
| 118 | TRAI | Telecom Regulatory Authority Of India |
| 119 | ASR | Access Switch Router |
| 120 | ASTB | Advanced Set-Top Box |
| 121 | BTS | Business Telecom Services |
| 122 | CORBA | Common Object Request Broker Architecture |
| 123 | COT | Central Office Terminal |
| 124 | CTAM | Cable & Telecommunications Association for Marketing |
| 125 | CTB | Composite Triple Beat |
| 126 | CTIA | Cellular Telecommunications and Internet Association |
| 127 | DCC | Data Communication Channel |
| 128 | DCD | Downstream Channel Descriptor |
| 129 | CEA | Consumer Electronics Association |
| 130 | CEP | Cable Entry Point |
| 131 | CIFS | Common Internet File System |
| 132 | CNR | Carrier-to-Noise Ratio |
| 133 | CSO | Composite Second Order |
| 134 | CSR | Customer Service Representative |
| 135 | COLD | Central Office Layout Design |
| 136 | COPS | Common Open Policy Service |
| 137 | CIM | Common Information Model |
| 138 | CIR | Committed Information Rate |
| 139 | CER | Codeword Error Ratio |
| 140 | CES | Circuit Emulation Service |
| 141 | ODA | Outlet Digital Adapter |
| 142 | ODRL | Open Digital Rights Language |
| 143 | CRL | Certificate Revocation List |
| 144 | CRM | Customer Relationship Management |
| 145 | ASIC | Application-Specific Integrated Circuit |
| 146 | ASM | Asset Management System |
| 147 | ASP | Average Selling Price |
| 148 | FSK | Frequency Shift Keying |
| 149 | FTMD | Full Track Music Download |
| 150 | CDR | Call Detail Record |
| 151 | CD-ROM | Compact Disk-Read Only Memory |
| 152 | CMTS | Cable Modem Termination System |
| 153 | OEM | Original Equipment Manufacturer |
| 154 | OEPL | Optical Ethernet Private Line |
| 155 | CMOS | Complimentary Metal-Oxide Semiconductor |
| 156 | CMS | Call Management Server |
| 157 | DMCA | Digital Millennium Copyright Act |
| 158 | DMH | Degraded Modem Hours |
| 159 | DSP | Digital Signal Processor |
| 160 | DSSS | Direct Sequencing Spread Spectrum |
| 161 | EAS | Emergency Alert System |
| 162 | ECR | Efficient Consumer Response |
| 163 | EPON | Ethernet Passive Optical Network |
| 164 | EPRI | Electric Power Research Institute |
| 165 | FCRC | Fragment Cyclic Redundancy Check |
| 166 | FDD | Frequency Division Duplexed |
| 167 | SDB | Switched Digital Broadcast |
| 168 | SDH | Synchronous Digital Hierarchy |
| 169 | SLIC | Subscriber Line Interface Card |
| 170 | SLM | Signal Level Meter |
| 171 | SRM | System Resource Manager |
| 172 | SRS | Stimulated Raman Scattering |
| 173 | SVOD | Subscription Video on Demand |
| 174 | SVP | Secure Video Processor |
| 175 | UGS | Unsolicited Grant Service |
| 176 | UHF | Ultra High Frequency |
| 177 | UMA | Unlicensed Mobile Access |
| 178 | UNE | Unbundled Network Element |
| 179 | VLAN | Virtual Local Area Network |
| 180 | VLL | Virtual Leased Line |
| 181 | WPE | Wireless Plant Extension |
| 182 | WRED | Weighted Random Early Detection |
| 183 | EPG | Electronic Program Guide |
| 184 | DSCP | Differentiated Service Code Point |
| 185 | DSL | Digital Subscriber Line |
| 186 | DMA | Designated Marketing Area |
| 187 | DMC | Dual Modem Cards |
| 188 | DAS | Direct Attached Storage |
| 189 | DAT | Digital Audio Tape |
| 190 | DBPSK | Differential Binary Phase Shift Keying |
| 191 | CPE | Customer Premises Equipment |
| 192 | CRA | Contention Resolution Algorithm |
| 193 | ASCII | American Standard Code for Information Interchange |
| 194 | ASI | Asynchronous Serial Interface |
| 195 | BTSC | Broadcast Television Systems Committee |
| 196 | CAB | Cable Advertising Bureau |
| 197 | CAC | Call Admission Control |
| 198 | RAID | Redundant Array of Inexpensive Disks |
| 199 | RBOC | Regional Bell Operating Company |
| 200 | ROAP | Rights Object Acquisition Protocol |
| 201 | ROB | Return on Bandwidth |
| 202 | SPP | Serial Port Profile |
| 203 | SPTS | Single Program Transport Stream |
| 204 | STS | Synchronous Transport Signal |
| 205 | SUT | System Under Test |
| 206 | TSR | Technical Service Representative |
| 207 | TSS | Telephony Switching Sub-System |
| 208 | UCC | Upstream Channel Change |
| 209 | VER | Virtual Ethernet Ring |
| 210 | WPA | Wireless (Wi-Fi) Protected Access |
| 211 | WPAN | Wireless Personal Area Network |
| 212 | VPN | Virtual Private Network |
| 213 | VRF | Virtual Routing and Forwarding |
| 214 | VHF | Very High Frequency |
| 215 | VHS | Video Home System |
| 216 | PID | Packet Identifier |
| 217 | PKI | Public Key Infrastructure |
| 218 | PLC | Packet Loss Concealment |
| 219 | PVC | Private Virtual Circuit |
| 220 | PVR | Personal Video Recorder |
| 221 | QAM | Quadrature Amplitude Modulation |
| 222 | RKS | Record Keeping Server |
| 223 | RMS | Root Mean Square |
| 224 | RNOC | Regional Network Operations Center |
| 225 | SIP | Session Initiation Protocol |
| 226 | SLA | Service Level Agreement |
| 227 | SLC | Shorten Last Codeword |
| 228 | STM | Synchronous Transport Module |
| 229 | STP | Spanning Tree Protocol |
| 230 | WAN | Wide Area Network |
| 231 | WCD | Wideband Channel Descriptor |
| 232 | WCM | Wideband Cable Modem |
| 233 | EML | Externally Modulated Laser |
| 234 | EMM | Entitlement Management Message |
| 235 | EMS | Element Management System |
| 236 | DVR | Digital Video Recorder |
| 237 | DVS | Digital Video Standard |
| 238 | DWDM | Dense Wavelength Division Multiplex |
| 239 | CLV | Consumer Lifetime Value |
| 240 | CMLA | Content Management License Administrator |
| 241 | CCM | Constant Coding and Modulation |
| 242 | CCS | Centum Call Seconds |
| 243 | ATSC | Advanced Television Systems Committee |
| 244 | AUP | Acceptable Use Policy |
| 245 | CD | Compact Disc |
| 246 | CDC | Connected Device Configuration |
| 247 | LRU | Least Recently Used |
| 248 | LSB | Least Significant Byte |
| 249 | LCP | Local Convergence Point |
| 250 | LCS | Line Code Signaling |
| 251 | IAG | Interactive Advertising Guidelines |
| 252 | IAMS | Intelligent Asset Management System |
| 253 | HDT | Host Digital Terminal |
| 254 | HDTV | High Definition Television |
| 255 | HIT | Headend Interface Terminal |
| 256 | CSH | Central Switch Homerun |
| 257 | CLI | Command Line Interface |
| 258 | CLR | Common Language Run-time |
| 259 | ARIB | Association of Radio Industries and Businesses |
| 260 | ARIN | American Registry of Internet Numbers |
| 261 | PON | Passive Optical Network |
| 262 | POS | Packet Over SONET |
| 263 | PSP | Packet Streaming Protocol |
| 264 | PSQ | Packet Streaming Queue |
| 265 | PTS | Program Transport Stream |
| 266 | PVC | Permanent Virtual Circuit |
| 267 | RIN | Relative Intensity Noise |
| 268 | RIP | Routing Information Protocol |
| 269 | SPE | Synchronous Payload Envelope |
| 270 | SPM | Self phase modulation |
| 271 | STG | Subscriber Telephony Gateway |
| 272 | TRP | Target Rating Points |
| 273 | TSI | Time Slot Interchange |
| 274 | VCR | Video Cassette Recorder |
| 275 | VDC | Volts Direct Current |
| 276 | WLAN | Wireless Local Area Network |
| 277 | WME | Wireless Media Extension |
| 278 | PSI | Program Specific Information |
| 279 | PSIP | Program and System Information Protocol |
| 280 | RFP | Request for Proposal |
| 281 | RIAA | Recording Industry Association of America |
| 282 | SAW | Surface Acoustic Wave |
| 283 | SBC | Switched Broadcast Client |
| 284 | SBM | Switched Broadcast Manager |
| 285 | SNMP | Simple Network Management Protocol |
| 286 | SOA | Semiconductor Optical Amplifier |
| 287 | SOAP | Simple Object Access Protocol |
| 288 | TNCS | Transmission Network Control System |
| 289 | TRI | Telephony Return Interface |
| 290 | VCI | Virtual Channel Identifier |
| 291 | VCM | Variable Coding and Modulation |
| 292 | IPAT | Internet Protocol Access Terminal |
| 293 | IPDR | Internet Protocol Detail Record |
| 294 | IPDT | Internet Protocol Digital Terminal |
| 295 | HSS | Home Subscriber Server |
| 296 | HTPC | Home Theatre Personal Computer |
| 297 | GSRM | Global System Resource Manager |
| 298 | GUI | Graphical User Interface |
| 299 | GVRP | GARP VLAN Registration Protocol |
| 300 | FCC | Federal Communications Commission |
| 301 | FCP | Fiber Channel Protocol |
| 302 | EPL | Ethernet Private Line |
| 303 | CSCF | Call State Control Function |
| 304 | DLNA | Digital Living Network Alliance |
| 305 | CPD | Common Path Distortion |
| 306 | DAC | Digital Addressable Controller |
| 307 | DARPA | Defense Advanced Research Projects Agency |
| 308 | CLE | Customer Located Equipment |
| 309 | CLEC | Competitive Local Exchange Carrier |
| 310 | CCI | Content Control Information |
| 311 | CCK | Complimentary Code Keying |
| 312 | ARCNET | Attached Resource Computer Network |
| 313 | ARF | Advertising Research Foundation |
| 314 | PBX | Private Branch Exchange |
| 315 | PCI | Peripheral Connect Interface |
| 316 | PCR | Program Clock Reference |
| 317 | PRM | Polarization Recovery Module |
| 318 | PRNG | Pseudo Random Number Generators |
| 319 | RFC | Request for Comment |
| 320 | SAP | Service Access Point |
| 321 | SARA | Scientific-Atlanta Resident Application |
| 322 | SATA | Serial Advanced Technology Attachment |
| 323 | SCP | Service Control Platform |
| 324 | SCR | Silicon Controlled Rectifier |
| 325 | SCSI | Small Computer System Interface |
| 326 | SHDB | Switched High-definition Digital Broadcast |
| 327 | SIC | Standard Industrial Classification |
| 328 | TELR | Talker Echo Loudness Rating |
| 329 | TKIP | Temporal Key Integrity Protocol |
| 330 | VBR | Variable Bit Rate |
| 331 | VCAT | Virtual Concatenation |
| 332 | VSAT | Very Small Aperture Terminal |
| 333 | VTS | Video Transport Service |
| 334 | HSD | High Speed Data |
| 335 | HSDPA | High Speed Downlink Packet Access |
| 336 | HSI | High-Speed Internet |
| 337 | GPS | Global Positioning Satellite |
| 338 | GRE | Generic Routing Encapsulation |
| 339 | GRM | Global Resource Manager |
| 340 | EIR | Excess Information Rate |
| 341 | EMI | Electro-Magnetic Interference |
| 342 | DRAM | Dynamic Random-Access Memory |
| 343 | DRM | Digital Rights Management |
| 344 | DSA | Dynamic Service Addition |
| 345 | DHWG | Digital Home Working Group |
| 346 | DLCI | Data Link Connection Identifier |
| 347 | DLL | Data Link Layer |
| 348 | CBT | Computer Based Testing (or Training) |
| 349 | CCDF | Complementary Cumulative Distribution Function |
| 350 | API | Application Programming Interface |
| 351 | APSK | Amplitude Phase Shift Keying |
| 352 | VAG | Voice Access Gateway |
| 353 | VBI | Vertical Blanking Interval |
| 354 | RTSP | Real Time Streaming Protocol |
| 355 | SAG | Synthetic Analog Gateway |
| 356 | SAN | Storage Area Network |
| 357 | PRBS | Pseudo-Random Binary Sequence |
| 358 | PRI | Primary Rate Interface |
| 359 | PBIA | Personal Broadband Industry Association |
| 360 | PBP | Personal Basis Profile |
| 361 | PBR | Policy Based Routing |
| 362 | NID | Network Interface Device |
| 363 | NIS | Network Infrastructure Solutions |
| 364 | MSC | Mobile Switching Center |
| 365 | MSPP | Multi-Service Provisioning Platform |
| 366 | MTA | Multimedia Terminal Adapter |
| 367 | MVNO | Mobile Virtual Network Operator |
| 368 | MDU | Multiple Dwelling Unit |
| 369 | MEMS | Micro-Electro-Mechanical Systems |
| 370 | LMP | Link Management Protocol |
| 371 | LOS | Loss of Signal |
| 372 | LPCM | Linear Pulse Code Modulation |
| 373 | OSC | Optical Supervisory Channel |
| 374 | OSI | Open Systems Interconnect |
| 375 | NTSC | National Television System Committee |
| 376 | NEMA | National Electrical Manufactures Association |
| 377 | NEMS | Network Element Management System |
| 378 | NGNA | Next Generation Network Architecture |
| 379 | MPLS | Multi Protocol Label Switching |
| 380 | MPTS | Multiple Program Transport Stream |
| 381 | MSB | Most Significant Byte |
| 382 | MDA | Model Driven Architecture |
| 383 | MDR | Mobile Digital Recorder |
| 384 | LMDS | Local Multipoint Distribution Service |
| 385 | LMI | Link Management Interface |
| 386 | LATA | Local Access and Transport Area |
| 387 | LCAS | Link Capacity Adjustment Scheme |
| 388 | NDVR | Network Digital Video Recording |
| 389 | NEBS | Network Equipment Building System |
| 390 | LED | Light Emitting Diode |
| 391 | LLC | Logical Link Control |
| 392 | ISTP | Internet Signaling Transport Protocol |
| 393 | HPNA | Home Phoneline Networking Alliance |
| 394 | HPOV | Hewlett Packard Open View |
| 395 | HQ | High Quality |
| 396 | HSA | High Speed Access |
| 397 | FSN | Full Service Network |
| 398 | FSO | Free Space Optical |
| 399 | FTP | File Transfer Protocol |
| 400 | EDGE | Enhanced Data-Rates for Global Evolution |
| 401 | EIA | Electronics Industry Association |
| 402 | DFB | Distributed Feedback |
| 403 | DHCP | Dynamic Host Configuration Protocol |
| 404 | DHEI | Digi-Cable Headend Expansion Interface |
| 405 | CATV | Community Antenna Television |
| 406 | CBR | Constant Bit Rate |
| 407 | ADSL | Asymmetric Digital Subscriber Line |
| 408 | AES | Advanced Encryption Standard |
| 409 | OMG | Object Management Group |
| 410 | ONDS | Optical Node Distribution Switch |
| 411 | ONT | Optical Network Termination |
| 412 | PESQ | Perceptual Evaluation of Speech Quality |
| 413 | PHS | Payload Header Suppression |
| 414 | RTP | Real-time Transport Protocol |
| 415 | RTPS | Real Time Polling Service |
| 416 | SCMS | Serial Copy Management System |
| 417 | SCO | Synchronous Connection Oriented |
| 418 | SES | Severely Errored Seconds |
| 419 | SGC | Signaling Gateway Controller |
| 420 | UTI | Universal Transport Interface |
| 421 | UTP | Unshielded Twisted Pair-Cable |
| 422 | VAD | Voice Activity Detection |
| 423 | WECA | Wireless Ethernet Compatibility Alliance |
| 424 | WEP | Wired Equivalent Privacy |
| 425 | AOD | Advertising On Demand |
| 426 | APD | Avalanche Photo Diode |
| 427 | PPT | Power Passing Tap |
| 428 | PPTP | Point-to-Point Tunneling Protocol |
| 429 | RCA | Root Cause Analysis |
| 430 | RDI | Remote Defect Indicator |
| 431 | ROI | Return on Investment |
| 432 | RTN | Regional Transport Network |
| 433 | RTOS | Real Time Operating System |
| 434 | SCM | Stored Content Manager |
| 435 | SDVOD | Standard Definition Video-on-Demand |
| 436 | RPD | Return Path Demodulator |
| 437 | RPM | Revolutions Per Minute |
| 438 | PPD | Post-pickup Delay |
| 439 | PPP | Point-to-Point Protocol |
| 440 | SMTP | Simple Mail Transfer Protocol |
| 441 | SNG | Satellite News Gathering |
| 442 | TDM | Time Division Multiplexing |
| 443 | TEC | Triggered Event Command |
| 444 | VRTX | Virtual Real-Time Extension |
| 445 | SBS | Switched Broadcast Server |
| 446 | SBV | Switched Broadcast Video |
| 447 | VSA | Vector Signal Analyzer |
| 448 | USF | Universal Service Fund |
| 449 | USM | User-based Security Model |
| 450 | SDRAM | Synchronous Direct Random-Access Memory |
| 451 | SDTV | Standard Definition Television |
| 452 | RPR | Resilient Packet Ring |
| 453 | RTI | Real Time Ingest |
| 454 | PSQM | Perceptual Speech Quality Measurement |
| 455 | PSTN | Public Switched Telephone Network |
| 456 | CWDM | Coarse Wavelength Division Multiplexing |
| 457 | CWM | Common Warehouse Metamodel |
| 458 | CLDC | Connection Limited Device Configuration |
| 459 | TIA | Telecommunications Industry Association |
| 460 | ACM | Adaptive Coding and Modulation |
| 461 | DENI | Digital Entertainment Networking Initiative |
| 462 | DES | Data Encryption Standard |
| 463 | DFAST | Dynamic Feedback Arrangement Scrambling Technique |
| 464 | ADI | Asynchronous Digital Interface |
| 465 | MIRS | Motorola Integrated Radio system |
| 466 | MTS | Mobile Telephone Service |
| 467 | ANF | Aggregate Noise Factor |
| 468 | ANSI | American National Standards Institute |
| 469 | CALEA | Communications Assistance for Law Enforcement Act |
| 470 | ISMS | Integrated Service Management System |
| 471 | ISO | International Organization for Standardization |
| 472 | LEC | Local Exchange Carrier |
| 473 | LVI | Low Voltage Integrator |
| 474 | MAC | Media Access Control |
| 475 | MCTF | Motion Compensated Temporal Filtering |
| 476 | MMI | Man Machine Interface |
| 477 | MPC | Media Player Controller |
| 478 | NDE | Network Dimensioning Engine |
| 479 | NDMH | Non-Degraded Modem Hours |
| 480 | NRSS | National Renewable Security Standard |
| 481 | NSI | Network Side Interface |
| 482 | NTS | Near Term Storage |
| 483 | OCSP | Online Certificate Status Protocol |
| 484 | OCST | Office of Cable Signal Theft |
| 485 | PMT | Program Map Table |
| 486 | POD | Point of Deployment |
| 487 | OSNR | Optical Signal-to-Noise Ratio |
| 488 | OSPF | Open Shortest Path First |
| 489 | OSS | Operational Support System |
| 490 | OLT | Optical Line Terminal |
| 491 | OMA | Open Mobile Alliance |
| 492 | ISV | Independent Software Vendor |
| 493 | ITA | Interactive Television Association |
| 494 | FLR | Frame Loss Ratio |
| 495 | FOSC | Fiber Optic Splice Closure |
| 496 | EDC | Electronic Dispersion Compensator |
| 497 | EDFA | Erbium Doped Fiber Amplifier |
| 498 | DPON | Deep-fiber Passive Optical Network |
| 499 | DPSK | Differential Phase Shift Keying |
| 500 | DPT | Dynamic Packet Transport |
| 501 | SCH | Synchronization Channel |
| 502 | SDMA | Spatial Division Multiple Access |
| 503 | MC | Message Center |
| 504 | MCS | Multi Carrier Mode |
| 505 | BTS | Base Transceiver Station |
| 506 | DAMPS | Digital Advance Mobile Phone Service |
| 507 | DTMF | Dual Tone Multiple Frequency |
| 508 | EIRP | Equivalent Isotropic Radiated Power |
| 509 | ESMR | Enhanced Specialized Mobile Radio |
| 510 | EVPL | Ethernet Virtual Private Line |
| 511 | FBI | Federal Bureau of Investigation |
| 512 | ATDMA | Asynchronous Time Division Multiple Access |
| 513 | ARP | Address Resolution Protocol |
| 514 | DVD | Digital Versatile Disc |
| 515 | DVI | Display Visual Interface |
| 516 | EVC | Ethernet Virtual Circuit |
| 517 | EVM | Error Vector Magnitude |
| 518 | FEC | Forwarding Equivalence Class |
| 519 | FHCS | Fragment Header Check Sequence |
| 520 | HDLC | High-Level Data Link Control |
| 521 | HDMI | High Definition Multimedia Interface |
| 522 | ILEC | Incumbent Local Exchange Carrier |
| 523 | IMD | Inter-Modulation Distortion |
| 524 | INA | Interactive Network Adaptor |
| 525 | ISA | Industry Standard Architecture |
| 526 | ISDN | Integrated Services Digital Network |
| 527 | ISM | Industrial Scientific Medical |
| 528 | IVR | Interactive Voice Response |
| 529 | KDCF | Korea Digital Cable Forum |
| 530 | LTS | Long Term Storage |
| 531 | NAT | Network Address Translation |
| 532 | NDA | Non-Disclosure Agreement |
| 533 | NOC | Network Operations Center |
| 534 | NPR | Noise Power Ratio |
| 535 | OUI | Organizationally Unique Identifier |
| 536 | PAT | Program Association Table |
| 537 | OFC | Optical Fiber Communication |
| 538 | PLT | Power-Line Telecommunications |
| 539 | PMD | Polarization Mode Dispersion |
| 540 | PCS | Personal Communications System |
| 541 | IRR | Internal Rate of Return |
| 542 | LSP | Label Switched Path |
| 543 | LSR | Label Switch Router |
| 544 | MHP | Multimedia Home Platform |
| 545 | MIB | Management Information Base |
| 546 | MIDP | Mobile Information Device Profile |
| 547 | NMS | Network Management System |
| 548 | PDA | Personal Digital Assistant |
| 549 | PDW | Polarization Dependent Wavelength |
| 550 | OTDR | Optical Time Domain Reflectometer |
| 551 | OTN | Optical Transition Node |
| 552 | NVM | Non-Volatile Memory |
| 553 | NNOC | National Network Operations Center |
| 554 | NNTP | Network News Transfer Protocol |
| 555 | LDAP | Lightweight Directory Access Protocol |
| 556 | LDP | Label Distribution Protocol |
| 557 | MEN | Metro Ethernet Network |
| 558 | NAPT | Network Address and Protocol Translation |
| 559 | NAS | Network Attached Storage |
| 560 | OEPLAN | Optical Ethernet Private Local Area Network |
| 561 | OEVPL | Optical Ethernet Virtual Private Line |
| 562 | NIU | Network Interface Unit |
| 563 | MER | Modulation Error Ratio |
| 564 | MGC | Media Gateway Controller |
| 565 | LDPC | Low Density Parity Check |
| 566 | LDS | Local Digital Switch |
| 567 | IGMP | Internet Group Multicast Protocol |
| 568 | IGP | Interior Gateway Protocol |
| 569 | IKE | Internet Key Exchange |
| 570 | HMS | Headend Management System |
| 571 | HOM | High-Order Modulation |
| 572 | FDDI | Fiber Distributed Data Interface |
| 573 | FEC | Forward Error Correction |
| 574 | ESC | Embedded Signaling Channel |
| 575 | ESP | Encapsulating Security Payload |
| 576 | ETSI | European Telecommunications Standards Institute |
| 577 | DUT | Device Under Test |
| 578 | DVB | Digital Video Broadcast |
| 579 | ASTD | American Society for Training and Development |
| 580 | ATA | Advanced Technology Attachment |
| 581 | ABSBH | Average Busy Season Busy Hour |
| 582 | ACAP | Advanced Common Application Platform |
| 583 | ACL | Access Control List |
| 584 | ACC | Analog Control Channel |
| 585 | APN | Access Point Name |
| 586 | SATCOM | Satellite Communications |
| 587 | TACS | Total Access Communications Systems |
| 588 | A/D | Analog to Digital |
| 589 | A/V | Audio/Video |
| 590 | AGC | Automatic Gain Control |
| 591 | AIS | Alarm Indication Signal |
| 592 | DCS | Digital Cross-connect System |
| 593 | DCT | Digital Communications (Cable) Terminal |
| 594 | DTCP | Digital Transmission Content Protection |
| 595 | DUN | Dial-Up Networking |
| 596 | ERIM | Erasmus Research Institute of Management |
| 597 | ERM | Edge Resource Manager |
| 598 | IDS | Intrusion Detection System |
| 599 | IDT | Integrated Digital Terminal |
| 600 | IEC | International Electrotechnical Commission |
| 601 | HDCP | High-bandwidth Digital Content Protection |
| 602 | HDD | Hard Disk Drive |
| 603 | ITU | International Telecommunications Union |
| 604 | IUC | Interval Usage Code |
| 605 | AMA | Automatic Message Accounting |
| 606 | AAC | Advanced Audio Codec |
| 607 | IPMP | Intellectual Property Management and Protection |
| 608 | DML | Data Manipulation Language |
| 609 | AACS | Advanced Access Content System |
| 610 | IPG | Interactive Program Guide |
| 611 | IANA | Internet Assigned Numbers Authority |
| 612 | ICB | Independent Customer Builds |
| 613 | GWC | Gate-Way Controller |
| 614 | HAN | Home Area Network |
| 615 | HCRP | Hard Copy Cable Replacement |
| 616 | IF | Intermediate Frequency |
| 617 | IFC | Initial First Cost |
| 618 | NASA | National Aeronautics and Space Agency |
| 619 | ROW | Return Order Wire |
| 620 | BW | Bandwidth |
| 621 | DCME | Digital Compressed Multiplication Equipment |
| 622 | BER | Bit Error Rate |
| 623 | ETACS | Extended TACS |
| 624 | IP | Internet Protocol |
| 625 | MIN | Mobile Identification Number |
| 626 | TDD | Time Division Duplex |
| 627 | TFT | Thin Film Transistor |
| 628 | HCS | Header Check Sequence |
| 629 | HD | High Definition |
| 630 | HDBH | High-Day Busy Hour |
| 631 | MTNL | Mahanagar Telephone Nigam limited |
| 632 | BSNL | Bhrat Snchar Nigm Limited |
| 633 | NTSC | National Television Standards Committee |
| 634 | NICNET | National Informatics Centre Network |
| 635 | LBS | Location-Based Services |
| 636 | LCD | Liquid Crystal Display |
| 637 | LMR | Land Mobile Radio |
| 638 | GMSK | Gaussian Minimum Shift Keying |
| 639 | IC | Integrated Circuit |
| 640 | GSN | GPRS Support Node |
| 641 | OC | Optical Carrier |
| 642 | PPDN | Public Packet Data Network |
| 643 | IPTA | Internet Protocol Transport Agreement |
| 644 | DPI | Digital Program Insertion |
| 645 | ICO | Incumbent Cable Operator |
| 646 | IDE | Integrated Device Electronics |
| 647 | IDEN | Integrated Dispatch Enhanced Network |
| 648 | IMEI | International Mobile Equipment Identity |
| 649 | IPTV | Internet Protocol Television |
| 650 | ICMP | Internet Control Message Protocol |
| 651 | DNS | Domain Name System |
| 652 | ETDMA | Extended Time Division Multiple Access |
| 653 | DNCS | Digital Network Control System |
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