ADPCM Adaptive Diferential PCM PCM dng vi phn thch ng. AD Analog/Digital Converter Chuyn i tng t/s. AM Amplitude Modulation iu ch bin . AMI Alternate Mark Inversion M o du lun phin. ARPA Advanced Research Projects Agency T chc cc d n nghin cu tin tin. ATM Asynchronous Transfer Mode Ch truyn khng ng b. AU Administrative Unit n v qun l. B-ISDN Broadband ISDN Mng a dch v bng rng.

B8ZS Bipolar with 8 Zero Substitution Phng php m ho lng cc thay th 8 s 0. BBN Bolt Beranek and Newman Ngng Be ranek v Newman. BER Bit Error Rate T l bit li. BSN Backward Sequence. Number S th t tn hiu hng v. BT Bridged Tap Ca trung chuyn. CAS Channel Associated Signaling Bo hiu lin knh. CCC Clear Channel Capability Dung lng knh trng. CCI-S Common Channel Interexchange Sibnaling Bo hiu lin i knh chung. CCR Customer Controlled Reconfiguration Ti nh hnh theo yu cu khch hng. CCS Common Channel Signaling Bo hiu knh chung. CODEC Code and Decode M ho v gii m. CMI Code Mark Inversion M o du. CPU Cyclic Redundancy Check n v iu khin trung tm. CRC Call Supervision Message Kim tra chng chp theo chu k. CSM Call Supervision Message Bn tin gim st cuc gi. DCE Data Circuit Equitment Thit b truyn s liu. DDS Digital Data System H thng d liu s. DF Data Flag C s liu. DPCM Differential PCM iu xung m vi phn. DOV Data Over Voice D liu ting ni. DS1 Digital Signal 1 Bo hiu s 1. DSL Digital Subscriber Line ng thu bao s. DSP Digital Signal Processor. B x l tn hiu s. DST Digital Synchronous Terminal u cui s ng b. DSU Data Service Unit n v dch v s liu. DSX Digital Signal Cross-connect Ni cho tn hiu s.

DTDM Dynamic TDM K thut dn knh phn chia khe thi gian ng. DTE Data Terminal Equipment Thit b u cui s liu. DUP Data User Part D liu ngi s dng. ECH Echo Cancellation Hybrid Sai ng trit ting di. EMD Edelmetall Motor Drehvaler Edelmetall Motor Drechvaler. ESS Electronic Switching System H thng chuyn mch in t. FAM Forward Address Message Thng tin a ch hng i. FDM Frequency Division Multiplex Ghp knh phn chia tn s. FSM Forward Setup Message Bn tin thit lp hng i. FEXT Far End Crosstalk Xuyn m u xa. FIB Forward Indicator Bit Bt ch th hng i.

FSN Forward Sequence Number S th t hng i. FLSU Fill in Signal Unit n v chn tn hiu. GND Ground Tip t.

HDB3 High Density Bipolar3 M lng cc mt cao thay th 3 s 0.

HRC Hypothetical Reference Circuit Mch tham kho gi thit. HRX Hypothetical Reference Connection ng ni tham kho gi thit. ICT Incoming Trunk Trung k n. IDN Integrated Digital Network Mng s tch hp. IMP Interface Message Processor B x l thng tin giao din. IN Intelligent Network Mng thng minh. IOT Intra Office Connection Ghp ni ni i. ISDN Integrated Services Digital Network Mng s a dch v. ISUP ISDN User Part Phn ngi s dng ISDN. ISVN Integrated Services Video Network Mng video a dch v.

ITU-T Telecommunication Standardization Sector of ITU Ban tiu chun ho vin thng ca t chc ITU.

LAN Local Area Network Mng cc b. LAPD Link Access Procedure on D channel Th tc truy nhp kt ni knh D. LC Line Concentrator B tp trung ng. LI Length Indicator B ch th di. LS Local Swich Chuyn mch vng. LSI Large Scale Integrated Mch tch hp mt cao. LSB Least Significant Bit Bt trng s thp nht. LSSU Link Status Signal Unit n v bo hiu trng thi kt ni. LT Line Termination Kt cui ng. MDB Modified Duo Binary M MDB. MFC Multifrequency Code M a tn MDF Main Distribution Frame Gi phi tuyn chnh. MF Multi-Frequency a tn. MIC Microware IC Vi mch siu cao tn. MSU Message Signal Unit n v bn tin bo hiu. MTP Messae Transfer Part Phn chuyn thng bo. NCU Network-Control Unit n v iu khin mng. NEXT Near End Crosstalk Xuyn m u gn. NNI Network-Node Interface Giao tip nt mng. NT Network Termination Kt cui Mng. NPT Non-Packet Terminal u cui khng gi.

OAM Operations, Administration and Maintenance Vn hnh, qun l v bo dng.

OC-1 Optical Carrier level 1 Truyn ti quang cp 1. OGT Outgoing Frunk Trung k i. OSI Open System Interconncetion Giao tip h thng m. PABX Private Automatic Branch Exchange Tng i c quan t ng. PBX Private Branch Exchange Tng i ni b. PAM Pulse Amplitude Modulation iu bin xung. PCM Pulse Code Modulation iu xung m. PIC Polyethylene Insulated Cable Cp cch in bng polietylen. PMX Packet Multiplex Exchange Tng i dn knh gi.

POH Path Overhead Tuyn cao. PSN Public switched Network Mng chuyn mch cng cng. PSTN Public switched Telephone network Mng chuyn mch in thoi cng cng. PWM Pulse Width Modulation iu ch rng xung. RSC Remote Subscriber Concentrator B tp trung thu bao xa. RSM Remote Subscriber Multiplexer B dn knh thu bao xa. RSS Remote Switching System H thng chuyn mch v tinh. RT Remote Terminal u cui xa.

RWRR Random Write Random Read Phng php ghi ngu nhin c ngu nhin.

RWSR Random Write Sequential Read Phng php ghi ngu nhin c tun t.

SCCP Signaling Connection Control Part Phn iu khin ghp ni bo bo hiu. SDTT Synchronous Digital Transmission Terminal u cui truyn dn s ng b. SIF Sigualing Information Field Truyn thng tin bo hiu. SLIC Subscriber Line Interface Circuit Mch giao tip ng thu bao. SIO Service Information Octet Octet thng tin dch v. SOH Section Overhead Tit din cao. SONET Synchronous Optical Network Mng quang ng b. SPC Stored Program Control iu khin bng chng trnh lu tr. SSB Single Side Band Bang n v. STM-1 Synchronous Transfer Mode level 1 Ch truyn ng b cp 1. STP Signaling Transfer Point im chuyn bo hiu. STS-1 Synchronous TRansport Signal level 1 Ti tn hiu ng b cp 1.

SWRR Sequential Write Random Read Phng php ghi tun t c ngu nhin.

SYNTRAN Synchronous Transmussion at DS3 Truyn dn ng b tiu chun DS3. TA Terminal Adaptor B tip hp u cui. TU Tributary Unit n v nhnh. TCM Time Compression Multiplex K thut ghp knh nn thi gian. TDM Time Division Multiplex K thut ghp knh phn chia thi gian. TE Terminal Equipment Thit b u cui. TUP Telephone User Part Phn ngi s dng in thoi. UNI User-Network Interface Giao din ngi s dng mng. VC Virtual Channel Knh o. VNSI Very large SCale Integration Mch tch hp mt siu cao. WABT WAit Before Transmission Th tc i trc khi truyn.

WDM Wavelength Division Multiplexing Phng php ghp knh phn chia di tn.

ZBTSI Zero byte Time Slot Interchange Hon i khe thi gian ca bite 0.