附录 A 缩略语缩略语英语解释中文解释AAM/CM Administration Module/Communication Module 管理和通信模块BBA BCCH Allocation BCCH分配BAM Back Administration Module 后管理模块BCC BTS Color Code 基站色码BCCH Broadcast Control CHannel 广播控制信道BCH Broadcast channel (transport channel) 广播信道（传输信道）BIE Base Station Interface Equipment 基站接口设备BITS Building Integrated Timing Supply 大楼综合定时供给系统BM Basic Module 基本模块BS Base Station 基站BS1 Abis Interface Abis接口BSC Base Station Controller 基站控制器BSIU Base Station Interface Unit 基站接口单元BSS Base Station Subsystem 基站子系统BTS Base Transceiver Station 基站收发信台CCA Cell Allocation 小区分配CBCH Cell Broadcast Channel 小区广播信道CC Country Code 国家码CCCH Common Control Channel 公共控制信道CCS Common Channel Signaling 共路信令方式CDU Combiner and Divider Unit 合分路单元CGI Cell Global Identification 全球小区识别码CIC Circuit Identification Code 电路识别码CRC Cyclic Redundancy Check 循环冗余校验CS-1 Code Scheme-1 编码模式－1（9.05kbit/s）CS-2 Code Scheme-2 编码模式－2（13.4kbit/s）CS-3 Code Scheme-3 编码模式－3（15.6kbit/s）CS-4 Code Scheme-4 编码模式－4（21.4kbit/s）CTN Central Switching Network Board 中央交换网板DDBF Database File 数据库文件DPC Destination (Signaling) Point Code 目的信令点编码DRX Discontinuous Reception 非连续接收DTX Discontinuous Transmission 非连续性发射EE3M E3 Sub-Multiplexer E3子复用设备EAC External Alarm Collection 外部告警采集ECSC Early Classmark Sending Control 早期类标发送控制EDU Enhanced Duplexer Unit 增强型双工单元EFR Enhanced full rate speech code 增强型全速率语音编解码EST Establishment 建立FFACCH Fast Associated Control Channel 快速随路控制信道FBC Photoelectric Conversion Board 光电转换板FBI Optical Fiber Interface Board 光接口板FPU Frame Processing Unit 帧处理单元FTC Full Rate Transcoder 全速率码变换器、全速率变码器FTP File Transfer Protocol 文件传输协议FUL Radio Signaling Link 无线信令链路GGALM Alarm board 告警板GCKS Clock source 时钟板GCTN Central switching Network board 中心交换网板GEMA Emergency Action board 双机倒换板GFBI Fiber Interface board 光纤接口板GLAP LAPD Protocol Process board LAPD协议处理板GMC2 Inter-Module Communication board，模块通信板GMCC Module Communication and Control board 模块通信控制板GMEM Memory board 数据库接口板GMPU Main Process Unit 主处理单元GNET Switching Network board 交换网板GNOD Node Communication Board 节点通信板GOPT Local Optical Interface Board 光纤通信板GPRS General Packet Radio Service 通用分组无线业务GPS Global Position System 全球定位系统GSM Global System for Mobile Communications 全球移动通信系统GSNT GSM Signaling Switching Network Board 信令交换网板HHDLC High-level Data Link Control 高级数据链路控制HO Handover 切换HPA High magnification Power Amplifier board 高增益功放板HSN Hopping Sequence Number 跳频序列号HW Highway 母线IID IDentification/IDentity 识别IND Indication 指示IOMU iSite Operation and Maintenance Unit 操作维护单元板IP Internet Protocol 互联网协议、网际协议LLAPD Link Access Protocol on the D-channel D信道上的链路访问协议LPN7 Common Channel Signaling Processing Board 公共信道信令处理板MMA Mobile Allocation 移动台（频率）分配MAIO Mobile Allocation Index Offset 移动分配索引偏移MCC Mobile Country Code 移动国家码MCK Main Clock board 主时钟板MFU Microcell Frame Unit 微蜂窝帧处理单元MMU Multiplication and Management Unit 复用管理单元MNC Mobile Network Code 移动网编号、移动网编码MS Mobile Station 移动台(手机)MSC Mobile Switching Center 移动交换中心MSM MSC Subrate channel Multiplexer MSC侧子复用板MTP Message Transfer Part 消息传递部分NNCC Network Color Code 网络色码NSS Network SubSystem 网络子系统OOM Opration and Maintenance 操作维护OMC Operation and MaintenanceCenter 操作维护中心OML Operation and Maintenance Link 操作与维护链路OMU Operation and Maintenance Unit 操作维护单元OPC Originating Point Code 源信令点编码PPb Pb Interface Pb接口PBCCH Packet Broadcast Control Channel 分组广播控制信道PBGT Power Budget 功率预算PBU Power Boost Unit 功率增强单元PCCCH Packet Common Control Channel 分组公共控制信道PCIC Packet Circuit Identity Code 分组电路标识码PCM Pulse-Code Modulation 脉冲编码调制PCU Packet Control Unit 分组控制单元PDH Plesiochronous Digital Hierarchy 准同步数字系列PDTCH Packet Data Traffic Channel 分组业务数据信道PLMN Public Land Mobile Network 公用陆地移动（通信）网PMU Power and Environment Monitoring Unit 电源环境监测板PSU Power Supply Unit 供电单元PWC Secondary Power Supply Board 二次电源板RRACH Random Access CHannel 随机接入信道RSL Radio Signaling Link 无线信令链路SSACCH Slow Associated Control Channel 慢速随路控制信道SAPI Service Access Point Identifier 业务接入点标识SCCP Signaling Connection Control Part 信令连接控制部分SCU Simple Combiner Unit 简单合路单元SDCCH Stand-alone Dedicated Control Channel 独立专用控制信道SITE Site 站点SM Sub-Multiplexer Interface 子复用板SMBCB Short Message Service Cell Broadcast 短消息业务小区广播SMI Sub-Multiplexer Interface 子复用板SP Signaling Point 信令点SS7 Signaling System Number 7 七号信令STP Signaling Transfer Point 信令转接点TTA Timing Advance 时间提前量TC Transcoder 码变换器TCH Traffic CHannel 业务信道TCSM Transcoder and Sub-Multiplexer 码变换与子复用单元（器）TEI Terminal Equipment Identifier 终端设备标识TES Transmission Extension power Supply unit 传输扩展供电单元TEU Transmission Extension Unit 传输扩展单元TFO Tandem Free Operation 免汇接运营TMU Timing/Transmission and Management Unit 定时/传输管理单元TRAU Transcoder & Rate Adaptation Unit 码变换器/速率适配单元TRX Transceiver 收发信机TS Timeslot 时隙TSC Training Sequence Code 训练系列号(编码）VVSWR Voltage Standing Wave Ratio 电压驻波比WWS Workstation 操作台A, Asub A-interface A接口AC Alternating Current 交流AC Access Class (C0 to C15) 接入级别（C0到C15）ACCH Associated Control Channel 随路控制信道ACELP Algebraic code excitation linear prediction 代数码激励线性预测ACOM Antenna Combiner 天线合路器AGCH Access Grant Channel 接入允许信道AM/CM Administration Module/ Communication Module 管理和通信模块ANSI American National Standard Institute 美国国家标准组织APC Automatic Power Control 自动功率控制API Application Program Interface 应用程序接口APL Advanced Phase Locking 高级时钟锁相ARFCN Absolute Radio Frequency Channel Number 绝对射频信道号ASIC Application Specific Integrated Circuit 专用集成电路AuC Authentication Center 鉴权中心BBA BCCH Allocation BCCH分配BAM Back Administration Module 后管理模块BCC BTS Color Code 基站色码BCCH Broadcast Control CHannel 广播控制信道BCF Base Control Function 基本控制功能BCH Broadcast channel (transport channel) 广播信道BER Bit Error Rate 误码率BHCA Busy Hour Call Attempt 忙时尝试呼叫BIE Base station Interface Equipment (board) 基站接口设备（板）BIOS Basic Input Output System 基本输入输出系统BITS Building Integrated Timing Supply 大楼综合定时供给系统BM Basic Module 基本模块BP Burst Pulse 突发脉冲BQ Bad Quality 质量差BS Base Station 基站BS1 Abis Interface Abis接口BSC Base Station Controller 基站控制器BSIC Base Station Identity Code 基站识别码BSMU Base Station Interface Unit 基站接口单元BSS Base Station Subsystem 基站子系统BSSAP Base Station Subsystem Application Part 基站子系统应用部分BSSGP Base Station Subsystem GPRS Protocol 基站系统GPRS协议BSSMAP Base Station Subsystem Management Application Part 基站子系统管理应用部分BSSOMAP Base Station Subsystem Operation and Maintenance Application Part 基站子系统操作与维护应用部分BTS Base Transceiver Station 基站收发信台BTSM Base Transceiver Station Management BTS管理BVC BSSGP Virtual Connection BSSGP虚拟连接CCA Cell Allocation 小区分配CAMEL Customized Applications for Mobile network Enhanced Logic 移动网络增强逻辑的客户化应用CBA Cell Bar Access 小区禁止接入CBC Cell Broadcast Center 小区广播中心CBCH Cell Broadcast CHannel 小区广播信道CBCCH Cell Broadcast Control Channel 小区广播控制信道CBQ Cell Bar Qualify 小区禁止限制CBSM Cell Broadcast Short Message 小区广播短消息CC Country Code 国家码CC Calling Control 呼叫控制CC Connection Confirm 呼叫控制CCB Call Control Block 呼叫控制块CCBS Completion of Calls to Busy Subscribers 遇忙回呼CCCH Common Control Channel 公共控制信道CCH Control Channel 控制信道CCS Common Channel Signaling 共路信令方式CD Call Deflection 呼叫偏移CDB Cell Broadcast Database 小区广播数据库CDU Combining and Distribution Unit 合分路单元CELP Code Excited Linear Prediction 码激励线性预测CGI Cell Global Identity 小区全球识别码CI Cell Identity 小区识别CIC Circuit Identify Code 电路识别码CIC Carrier Interface Controller board 载频接口控制器CIR Carrier to Interference Ratio 载干比CKSN Ciphering Key Sequence Number 密钥序列号CKV Clock Drive board 时钟驱动板CM Connection Management 接续管理CPU Central Processing Unit 中央处理单元CR Connection Request 连接请求CRC Cyclic Redundancy Check 循环冗余校验CRO Cell Reselect Offset 小区重选偏移CS Coding Scheme （信道）编码方式CS-1 Code Scheme-1 编码模式－1（9.05kbit/s）CS-2 Code Scheme-2 编码模式－2（13.4kbit/s）CS-3 Code Scheme-3 编码模式－3（15.6kbit/s）CS-4 Code Scheme-4 编码模式－4（21.4kbit/s）CTN Central Switching Network Board 中央交换网板DDB DataBase 数据库DBF Database File 数据库文件DBMS Database Management System 数据库管理系统DC Direct Current 直流DCCH Dedicated Control Channel 专用控制信道DCL Diagnostic Control Link 诊断控制链路DDN Digital Data Network 数字数据网DL Downlink 下行链路DLC Data Link Connection 数据链路连接DLCEP Data Link Connection End Point 数据链路连接端点DLCEPI Data Link Connection End Point Identifier 数据链路连接端点标识DLCI Digital Link Connection Identity 数据链路连接标识DNS Domain Name Server 域名服务器DPC Destination (Signaling) Point Code 目的信令点编码DRDBMS Distributed Relational DBMS 分布式关系数据库管理系统DRX Discontinuous Reception (mechanism) 不连续接收DSC Downlink Signaling fault Count 下行信令故障计数DSP Digital Signal Processor 数字信号处理器DTAP Direct Transfer Application Part 直接传输应用部分DTMF Dual Tone Multi-frequency 双音多频（收号器）DTX Discontinuous transmission (mechanism) 不连续发送（机制）EE-Abis Enhanced Abis 增强型AbisE3M E3 Sub-Multiplexer 增强型E1子复用设备EA Early Allocation 预分配EAC External Alarm Collection 外部告警采集EC Emergency Call 紧急呼叫ECSC Early Classmark Sending Control 早期类标发送控制ECT Explicit Call Transfer 显示呼叫转移EDU Enhanced Duplexer Unit 增强型双工单元EFR Enhanced full rate speech code 增强型全速率语音编解码EIR Equipment Identity Register 设备识别寄存器EM Extended Measurement 扩展测量EMC Electromagnetic Compatibility 电磁兼容性EST Establishment 建立ETS European Telecommunication Standard 欧洲电信标准ETSI European Telecommunication Standard Institute 欧洲电信标准组织FFACCH Fast Associated Control CHannel 快速随路控制信道FBC Photoelectric Conversion Board 光电转换板FBI Optical Fiber Interface Board 光接口板FCCH Frequency Correction CHannel 频率校正信道FCS Frame Check Sequence 帧校验序列FDMA Frequency Division Multiple Access 频分多址FH Frequency Hopping 跳频FIR Finity Impulsion Response 有限冲击响应FN Frame Number 帧号FPU Frame Processing Unit 帧处理单元FR Frame Relay 帧中继FTAM File Transfer Access and manipulation 文件传输、接入及使用FTC Full Rate Transcoder 码变换板FTP File Transfer Protocol 全速率码变换器FUC Frame Unit Controller 帧单元控制器FUL Radio Signaling Link 无线信令链路GG-Abis GPRS Abis GPRS AbisGALM Alarm board 告警板GCKS Clock source 时钟板GCTN Central switching Network board 中心交换网板GEMA Emergency Message Automatic Transmission System 双机倒换板GFBI Fiber Interface board 光纤接口板GGSN Gateway GPRS Support Node 网关GPRS支持节点GLAP LAPD Protocol Process board LAPD协议处理板GMC2 Inter-Module Communication board 模块通信板GMCC Module Communication and Control board 模块通信控制板GMEM Memory board 数据库接口板GMM GPRS Mobility Management GPRS移动性管理GMPU Main Processing Unit 主处理单元GMSC Gateway Mobile Switching Center 关口局GMSK Gaussian Minimum Shift-frequency Keying 高斯滤波最小移频键控GNET Intra-module switching network board 交换网板GNOD Node Communication Board 节点通信板GOPT Local Optical Interface Board 光纤通信板GPRS General Packet Radio Service 通用分组无线业务GPS Global Position System 全球定位系统GPWS GSM Secondary Power board 二次电源板GSM，GSM900，GSM1800 Global System for Mobile communications 全球移动通信系统，900MHz的GSM系统，1800MHz的GSM系统GSN GPRS Support Node GPRS支持节点GSNT GSM Signaling Switching Network Board 信令交换网板GT Global Title 全局码GTP GPRS Tunnelling Protocol GPRS隧道协议HHC/HY COM Hybrid Combiner 混合桥型合路器HCS Hierarchical Cell Structure 小区分层结构HDLC High level Data Link Control 高级数据链路控制HDSL High speed Digital Subscriber Line 高速数字用户线HLR Home Location Register 归属位置寄存器HO Handover 切换HPA High magnification Power Amplifier board 高增益功放板HSC Hot Swap Controller 热倒换控制器HSN Hopping Sequence Number 跳频序列号HW Highway 高速通路IID IDentification/IDentity 识别IEC International Electrotechnical Commission 国际电工委员会IMEI International Mobile station Equipment Identity 国际移动终端设备标识IMSI International Mobile Station Identity 国际移动用户识别码IND Indication 指示IOMU iSite Operation and Maintenance Unit 操作维护单元板IP Internet Protocol 互联网协议ISDN Integrated Services Digital Network 综合业务数字网ISO International Standard Organization 国际标准化组织ISR Interrupt Service 中断服务程序ISUP Integrated Services Digital Network User Part/ISDN User Part （七号信令之）ISDN用户部分ITU International Telecommunication Union 国际电信联盟ITU-T International Telecommunication Union - Telecommunication Standardization Sector 国际电信联盟-电信标准部IWF Inter-working Function 互连功能J- -KLL2ML Layer 2 Management Link 层2管理链路L3MM Layer-3 Mobility Management 层三移动管理LA Location Area 位置区LAC Location Area Code 位置区码（LAC）LAI Location Area Identity 位置区标识LAP Link Access Protocol 协议处理板LAPD Link Access Protocol on the D-channel D信道上的链路访问协议LAPDMAIL LAPD Mail Box LAPD邮箱LAPDm Link Access Protocol on the Dm channel Dm信道上的链路访问协议LLC Logical Link Control 逻辑链路控制LMT Local Maintenance Terminal 本地维护终端LNA Low Noise Amplifier 低噪声放大器LPN7 Common Channel Signaling Processing Board 公共信道信令处理板MMA Mobile Allocation 移动台（频率）分配MAC Media Access Control 媒质接入控制MAIO Mobile Allocation Index Offset 移动分配索引偏移MAP Mobile Application Part 移动应用部分MBR Multiband Report 多频报告MCC Mobile Country Code 移动国家码MCK Main ClocK board 主时钟板MCP Multiple Communication-Protocol Processor 多重通信协议处理器MDC Message Discrimination 消息鉴别MDSL Medium Bit-rate Digital Subscriber Loop 中速数字用户环线MDT Message Distribution 消息分配ME Mobile Equipment 移动设备MFU Microcell Frame Unit 微蜂窝帧处理单元MM Mobility Management 移动性管理MMU Multiplication and Management Unit 复用管理单元MNC Mobile Network Code 移动网号MNS Mobile Network Signaling 移动网信令MR Measurement Result 测量结果MR Measurement Report 测量报告MRP Multiple Reuse Pattern 多重复用方式MRT Message Routing 消息路由MS Mobile Station 测量报告MSC Mobile services Switching Centre, Mobile Switching Centre 移动交换中心MSISDN Mobile Station International ISDN Number 移动台国际ISDN号码MSM MSC Subrate channel Multiplexer MSC侧子复用板MT Mobile Terminal 移动终端MTBF Mean Time Between Failure 平均无故障时间MTP Message Transfer Part 消息传输部分NNC Network Control 网络控制NCC Network Color Code 网络色码NCH Notification Channel 通知信道NE Network Equipment 网络设备NM Network Management 网络管理NS Network Service 网络服务NSE Network Service Entity 网络服务实体NSS Network SubSystem 网络子系统OO&M, OM Operations & Maintenance 操作与维护OACSO Off Air Call Set up 不占用空中通道的呼叫启动OAM Operation Administration and Maintenance 运行管理和维护OMAP Operation and Maintenance Application Part 操作维护应用部分OMC Operations & Maintenance Centre 操作维护中心OML Operation and Maintenance Link 操作与维护链路OMU Operations & Maintenance Unit (board) 操作维护单元（板）OOP Object Oriented Programming 面向对象的程序设计OPC Originating Point Code 源信令点编码OPT Optic Interface board 光纤通信板OS Operation System 操作系统OSI Open System Interconnection 开放系统互连模型PPA Power Amplifier 功率放大器PAGCH Packet Access Grant Channel 分组接入允许信道PBCCH Packet Broadcast Control Channel 分组广播控制信道PBGT Power Budget 功率预算PBU Power Boost Unit 功率增强单元Pb Pb Interface Pb接口PbSL PCU-BSC Signaling Link PCU-BSC间信令链路PCCCH Packet Common Control Channel 分组公共控制信道PCH Paging CHannel 寻呼信道PCIC Packet Circuit Identity Code 分组电路标识码PCM Pulse-Code Modulation 脉冲编码调制PCU Packet Control Unit 分组控制单元PD Protocol Discrimination 协议识别码PDCH Packet Data Channel 分组数据信道PDH Plesiochronous Digital Hierarchy 准同步数字系列PDN Packet Data Network 分组数据网PDP Packet Data Protocol 分组数据协议PDTCH Packet Data Traffic Channel 分组业务数据信道PI Peripheral Interface 外设接口部件PIN Personal Identity Number 个人识别码PLL Phase Locked Loop 锁相环路PLMN Public Land Mobile Network 公用陆地移动网络PMU Power and Environment Monitoring Unit 电源环境监测板PNCH Packet Notification Channel 分组通知信道POMU Packet Operation & Maintenance Unit 分组操作维护单元PON Passive Optical Network 无源光网络PPCH Packet Paging Channel 分组寻呼信道PRACH Packet Random Access Channel 分组随机接入信道PSDN Public Switched Data Network 公用数据交换网PSI Packet System Information 分组系统消息PSK Phase Shift Keying 相移键控PSTN Public Switched Telephone Network 公用电话交换网PSU Power Supply Unit 供电单元PT Penalty Time 惩罚时间PTCCH Packet Timing advance Control Channel 分组定时提前控制信道PTM Point To Multipoint 点到多点PTM-M Point To Multipoint Multicast 点对多点广播PTM-SC Point to Multipoint Service Center 点到多点数据服务中心PTP Point To Point 点对点PWC Secondary Power Supply Board 电源控制板QQoS Quality of Service 业务质量RRACH Random Access Channel 随机接入信道RE Reestablishment 呼叫重建RF Radio Frequency 射频RLC Radio Link Control 无线链路控制RLM Radio Link Management 无线链路管理RPE-LTP Regular Pulse Excitation-Long Term Prediction 规则脉冲激励-长期预测RPPU Radio Packet Process Unit 无线分组处理单元RR Radio Resource 无线资源RSA Rivest-Shamir-Adleman 通用关键子密码方法RSL Radio Signaling Link 无线信令链路RTE Radio Test Equipment 天线测试设备RX Receiver/Reception 收信机/接收RXLEV Received signal level 接收信号等级RXQUAL Received Signal Quality 接收信号质量SSABM Set Asynchronous Balanced Mode 置异步平衡模式SACCH Slow Associated Control Channel 慢速随路控制信道SACCH/C4 Slow Associated Control Channel/SDCCH/4 慢速随路控制信道/SDCCH/4 SACCH/C8 Slow Associated Control CHannel/SDCCH/8 慢速随路控制信道/SDCCH/8 SACCH/T Slow Associated Control CHannel/Traffic channel 慢速随路控制信道/业务信道SACCH/TF Slow Associated Control Channel/Traffic channel Full rate 慢速随路控制信道/全速率业务信道SAP Service Access Point 服务接入点SAPI Service Access Point Identifier 业务接入点标识SCCP Signaling Connection Control Part 信令连接控制部分SCH Synchronization CHannel 同步信道SCMG SCCP Management SCCP管理SCU Simple combining Unit 简单合路单元SDCCH Stand-alone Dedicated Control CHannel 独立专用控制信道SDH Synchronous Digital Hierarchy 同步数字系列SDU Service Data Unit 业务数据单元SGSN Serving GPRS Support Node 服务GPRS支持节点SID Silence Descriptor 静噪指示SIG Signaling 信令SIM Subscriber Identity Module 用户识别卡SITE Site 站点SLM Signaling Link Management 信令链路管理SLS Signaling Link Selection 信令链路选择码SM Sub-Multiplexer Interface 子复用板SM-SC Short Message - Service Center 短消息中心SMBCB Short Message Service Cell Broadcast 短消息业务小区广播SMC Short Message Center 短消息中心SMI Sub-Multiplexer Interface 子复用板SMS Short Message Service 短消息业务SMS-GMSC Short Message Service - Gateway MSC 短消息关口MSC SMS-IWMSC Short Message Service Interworking MSC 短消息互联MSC SMSCB Short Message Service Cell Broadcast 短消息小区广播SMUX Sub-Multiplexer 子复用器SNDCP SubNetwork Dependent convergence Protocol 子网相关的收敛协议SOR Support Optimization Routing 支持优选路由SP Signaling Point 信令点SRM Signaling Route Management 信令路由管理SS Supplementary Service 补充业务SS7 Signalling System No.7 七号信令SSN SubSystem Number 子系统号STM Signaling Traffic Management 信令业务管理STP Signaling Transfer Point 信令转接点TTA Timing Advance 定时提前量TAI Timing Advance Index 时间提前量索引TBF Temporary Block Flow 临时数据块流TC Transcoder 码变换器TCH Traffic Channel 业务信道TCH/F A full rate TCH 全速率业务信道TCH/F2.4 A full rate data TCH (2.4kbit/s) 全速率数据业务信道（2.4kbit/s）TCH/F4.8 A full rate date TCH (4.8kbit/s) 全速率数据业务信道（4.8kbit/s）TCH/F9.6 A full rate data TCH (9.6kbit/s) 全速率数据业务信道（9.6kbit/s）TCH/FS A full rate Speech TCH 全速率话音业务信道TCI Terminal Interface board 终端接口板TCP Transmission Control Protocol 传输控制协议TCSM TransCoder & Sub-Multiplexer 码变换与子复用单元TDMA Time Division Multiple Access 时分多址TE Terminal Equipment 终端设备TEI Terminal Equipment Identifier 终端设备识别码TES Transmission Extension power Supply unit 传输扩展供电单元TEU Transmission Extension Unit 传输扩展单元TFI Transport Format Indicator 传输格式指示TFO Tandem Free Operation 免汇接运营TLLI Temporary Link Level Identity 临时链路等级标识TMSC Tandem Mobile Switching Centre 汇接移动交换中心TMSI Temporary Mobile Subscriber Identifier 临时移动用户标识符TMU Timing/Transmission and Management Unit 定时/传输管理单元TN Timeslot Number 时隙号TNI Terminal Network Interface 终端网络接口部件TO Temporary Offset 临时偏移TRAU Transcoder & Rate Adaptation Unit 码变换器/速率适配单元TRX Transceiver (board) 收发信机TS Timeslot 时隙TSC Training Sequence Code 训练系列号(编码）TUP Telephone User Part(SS7) 电话用户部分UUA Unnumbered Acknowledge 无编号证实UDP User Datagram Protocol 用户数据报协议UDT Unit Data 单位数据UI Unnumbered Information (frame) 无编号信息帧Um 空中接口USF Uplink State Flag 上行链路状态标识USSD Unstructured Supplementary Service Data 非结构化补充业务数据VV AD V oice Activity Detection 话音激活检测VBS V oice Broadcast Service 话音广播呼叫业务VEA Very Early Allocation 很早分配VGCS V oice Group Call Service 话音组呼业务VLR Visitor Location Register 拜访用户位置寄存器VM Voice Mailbox 语音邮箱VSAT Very Small Aperture Terminal 甚小天线卫星地球站WWDT Watchdog Timer 看门狗WS Workstation 操作台XxDSL x Digital Subscriber Line x数字用户线YZ爱尔兰表：某基站站型为S4/4/4。