China National Standards

China telephone Industry Standards English PDF List


  •  China "telephone" Industry Standards English PDF List:
  • Standard  Code Standard Title Standard Class Order
    YD/T 4423-2023 Technical requirements for intelligent data analysis and processing based on telephone channels {译}
    基于电话信道的数据智能分析和处理技术要求
    China Telecommunication Industry Standards
    telephone

    English PDF
    TB/T 3577-2022 Railway tunnel emergency telephone system {译}
    铁路隧道应急电话系统
    China Railway Transport Industry Standards
    telephone

    English PDF
    YD/T 4128-2022 Green Design Product Evaluation Technical Specifications Fixed telephone {译}
    绿色设计产品评价技术规范 固定电话
    China Telecommunication Industry Standards
    telephone

    English PDF
    JR/T 0188—2020 Specification for outbound telephone dialing services in the banking industry {译}
    银行业电话外拨服务规范
    China Finance Industry Standards
    telephone

    English PDF
    JT/T 1019.6-2016 (Traffic systems - Monitoring telephone systems - Part 6: Knowledge base data elements)
    12328交通运输服务监督电话系统 第6部分:知识库数据元
    China Highway & Transportation Standards
    telephone

    English PDF
    JT/T 1019.5-2016 (Traffic systems - Monitoring telephone systems - Part 5: Classification statistics)
    12328交通运输服务监督电话系统 第5部分:分类统计指标
    China Highway & Transportation Standards
    telephone

    English PDF
    JT/T 1019.4-2016 (Traffic systems - Monitoring telephone systems - Part 4: Business classification codes)
    12328交通运输服务监督电话系统 第4部分:业务分类代码
    China Highway & Transportation Standards
    telephone

    English PDF
    JT/T 1019.3-2016 (12328 Transport service supervision telephone systems - Part 3: Data exchange and information sharing interface technical requirement)
    12328交通运输服务监督电话系统 第3部分:数据交换与信息共享接口技术要求
    China Highway & Transportation Standards
    telephone

    English PDF
    JT/T 1019.2-2016 (12328 Transport service supervision telephone systems - Part 2: General Technical Requirements)
    12328交通运输服务监督电话系统 第2部分:总体技术要求
    China Highway & Transportation Standards
    telephone

    English PDF
    JT/T 1019.1-2016 (12328 Transport service supervision telephone systems - Part 1: Business Process Specification)
    12328交通运输服务监督电话系统 第1部分:业务流程规范
    China Highway & Transportation Standards
    telephone

    English PDF
    YD/T 695-2015 (City telephone communication system over-voltage over-current protection principles and technical requirements)
    市话通信系统过电压过电流防护原则及技术要求
    China Telecommunication Standards
    telephone

    English PDF
    JR/T 0123.4-2014 (Non-financial institution payment service facilities standardized testing - Part 4: Fixed telephone payment)
    非金融机构支付业务设施检测规范 第4部分:固定电话支付
    China Finance Standards
    telephone

    English PDF
    YD 5084.1-2014 (Switching equipment to detect anti-seismic performance specifications Part I: program-controlled digital telephone switches)
    交换设备抗地震性能检测规范第一部分:程控数字电话交换机
    China Telecommunication Standards
    telephone

    English PDF
    YD 5077-2014 (Fixed telephone switching network engineering acceptance)
    固定电话交换网工程验收规范
    China Telecommunication Standards
    telephone

    English PDF
    YD 5076-2014 (Fixed Switched telephone Network engineering design specifications)
    固定电话交换网工程设计规范
    China Telecommunication Standards
    telephone

    English PDF
    YDB 142.2-2013 The parameter and measurement of energy saving for multimedia telecommunications terminal. Part 2: Visual telephone
    多媒体终端设备节能参数和测试方法 第2部分:可视电话
    China Telecommunication Standards
    telephone

    English PDF
    SN/T 1429.10-2012 Rules for the inspection of information technical equipments for import and export. Part 10: Energy efficiency for cordless telephone
    进出口信息技术设备检验规程 第10部分:无绳电话的能效
    China Import Export Inspection Standards
    telephone

    English PDF
    YD/T 907-2011 Arrangement of digits, letters and symbols on telephones and other devices that can be used for gaining access to a telephone network
    接入电话网的电话机和其它设备上用于发号的数字、字母和符号规定
    China Telecommunication Standards
    telephone

    English PDF
    JJF 1279-2011 The program for pattern evaluation of signle and dispersion controled centrely telephone accounter
    单机型和集中管理分散计费型电话计时计费器型式评价大纲
    China Metrological Standards
    telephone

    English PDF
    DL/T 598-2010 Technical specifications for automatic exchange telephone network of electric power system
    电力系统自动交换电话网技术规范
    China Electricity & Power Standards
    telephone

    English PDF
    YD/T 2167-2010 The technical requirement and test method of 3G video telephone service between operators
    第三代移动通信(3g)可视电话业务网间互通技术要求和测试方法
    China Telecommunication Standards
    telephone

    English PDF
    QB/T 4030-2010 telephone cable paper
    电话纸
    China Light Industry Standards
    telephone

    English PDF
    YD/T 1889-2009 The Requirements of Hearing Aids Compatibility and Measurement Methods for telephone Handset
    手柄电话助听器耦合技术要求和测量方法
    China Telecommunication Standards
    telephone

    English PDF
    TB/T 1500.6-2009 Operation of receiving and departing trains. Part 6: On single and double lines with telephone block and without interlocking
    接发列车作业 第6部分 单双线电话闭塞无联锁
    China Railway & Train Standards
    telephone

    English PDF
    JT/T 703-2007 Technical requirements of high class highway emergency telephone
    高速公路紧急电话系统
    China Highway & Transportation Standards
    telephone

    English PDF
    SN/T 1429.7-2007 Rules for the inspection of information technology equipment for import and export. Part 7: Cord telephone
    进出口信息技术设备检验规程 第7部分:有线电话机
    China Import Export Inspection Standards
    telephone

    English PDF
    YD/T 1662-2007 Testing Methods for National No.7 Signalling System. GSM Mobile telephone User Part (MTUP)
    国内no.7信令方式测试方法--gsm移动电话用户部分(mtup)
    China Telecommunication Standards
    telephone

    English PDF
    TB/T 2354-2007 Passenger train crew telephone
    旅客列车乘务电话
    China Railway & Train Standards
    telephone

    English PDF
    YD/T 868-2007 Technical Requirements and Measuring Methods for Additional Equipments of telephone Set
    电话机附加设备技术要求及测试方法
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 1626-2007 Technical Requirement and Test Methods for Fixed Wireless telephone
    固定无线电话机技术要求和测试方法
    China Telecommunication Standards
    telephone

    English PDF
    JT/T 680.15-2007 Technical requirement for the installation, operation, maintenance and repair of marine navigation equipment. Part 15: Survival craft two-way VHF radio telephone apparatus
    船用通信导航设备的安装、使用、维护、修理技术要求 第15部分:救生艇(筏)双向甚高频便携式无线电话
    China Highway & Transportation Standards
    telephone

    English PDF
    YD/T 789-2006 Technical Requirements and Measuring Methods of Hands-Free telephone Sets
    免提电话机技术要求和测试方法
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 589-2006 Basic Requirement of Transmission Impairment Tolerance for Group 3 Document Facsimile on the telephone Network
    电话网上文件传真三类机承受传输损伤能力的基本要求
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 1517-2006 Testing Method for Intelligent Terminal Equipment based on IP:IP telephone Terminal
    ip智能终端设备测试方法--ip电话终端
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 1516-2006 Technical Requirements for Interlligent Terminal Equipment based on IP:IP telephone Terminal
    ip智能终端设备技术要求--ip电话终端
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 992-2006 Technical Requirements and Testing methods of telephone Additional functions
    电话机附加功能的基本技术要求及检验方法
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 5053-2005 Specifications of Engineering Design for telephone Network Management System
    电话网网管系统工程设计规范(附条文说明)
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 1361-2005 Technical requirements and testing methods for telephone dialer
    电话拨号器技术要求和测试方法
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 1349-2005 Technical Requirements and Testing Methods for 2.4GHzDigital Cordless telephone Sets
    2.4ghz数字无绳电话机技术要求和测试方法
    China Telecommunication Standards
    telephone

    English PDF
    TB/T 2355-2005 The specification and test methods of communication column for railway track-side telephone
    铁路区间电话通话柱技术要求和试验方法
    China Railway & Train Standards
    telephone

    English PDF
    TB/T 2029-2005 The specification and test methods for manual telephone system for railway
    铁路人工话务系统设备技术要求和试验方法
    China Railway & Train Standards
    telephone

    English PDF
    JT/T 621-2005 GSM/CDMA emergency telephone system for highway
    公路gsm/cdma数字紧急电话系统
    China Highway & Transportation Standards
    telephone

    English PDF
    SJ 20913-2004 Network management protocol and interface requirements for the military digital secure automatic telephone network
    军用数字保密自动电话网网络管理协议和接口要求
    China Electronics Standards
    telephone

    English PDF
    YD/T 1304-2004 Test specification for national No.7 signaling system. Message Transfer Part (MTP) and telephone User Part (TUP)
    国内no.7信令方式测试方法——消息传递部分(mtp)和电话用户部分(tup)
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 1308-2004 The technical requirements of intelligent public telephone system
    智能公用电话系统技术要求
    China Telecommunication Standards
    telephone

    English PDF
    JJG 983-2003 Verification Regulation of Verifying Instrument for Single and Dispersion Controlled Centrally telephone Accounter
    单机型和集中管理分散型电话计费器检定仪检定规程
    China Metrological Standards
    telephone

    English PDF
    YD/T 1285-2003 The test method for quality of communication for inter-public telecom network. Call complete ratio and post-dialing delay for telephone call
    公用电信网间通信质量测试方法——电话呼叫的接通率和拨号后时延
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 1284-2003 The technical requirement for quality of communia-cation for inter. public telecom network-call completion rate post dialing delay for telephone call
    公用电信网间通信质量技术要求——电话呼叫的接通率和拨号后时延
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 1278-2003 The technical demand and testing method for the charging performance of SPC. telephone network part
    在用局用交换设备计费技术要求和检测方法——固定电话网部分
    China Telecommunication Standards
    telephone

    English PDF
    JJG 977-2003 Verification Regulation of Timing and Charging Device for IC Card Public telephone
    ic卡公用电话计时计费装置检定规程
    China Metrological Standards
    telephone

    English PDF
    SJ 20859-2002 Network management protocol and interface requirements for the military digital secure automatic telephone network
    军用毫米波微波管陶瓷金属化膜层规范
    China Electronics Standards
    telephone

    English PDF
    JJG 869-2002 Verification Regulation of Electro-acoustical Measurement Instruments for telephone Set
    电话电声测试仪检定规程
    China Metrological Standards
    telephone

    English PDF
    YD/T 1227-2002 The technical specification of multimedia IC card public telephone system
    多媒体ic卡公用电话系统技术规范
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 1189-2002 The Technical specification of mobile IC card public telephone system
    移动ic卡公用电话系统技术要求
    China Telecommunication Standards
    telephone

    English PDF
    TB/T 3026.4-2002 The digital conference telephone handset distributor technical requirements and test methods
    数字会议电话 话筒分配器技术要求和试验方法
    China Railway & Train Standards
    telephone

    English PDF
    SJ 20798-2001 General specification for the key management center in the military digital secure automatic telephone network
    军用激光器及相关支持设备的安全设计要求
    China Electronics Standards
    telephone

    English PDF
    YD/T 1150-2001 The technical specification for intelligent public telephone service
    智能公用电话业务技术规范
    China Telecommunication Standards
    telephone

    English PDF
    TB 10036-2000 Code for design of railway SPC digital telephone switching engineering
    铁路时分数字程控电话交换工程设计规范(附条文说明)
    China Railway & Train Standards
    telephone

    English PDF
    YD/T 1056-2000 Requirement for establishment of network of special services for different kinds of local telephone networks
    各类本地电话网特服业务台组网要求
    China Telecommunication Standards
    telephone

    English PDF
    TB/T 2997.3-2000 Railway programmed telephone equipment collinear tandem technical requirements and test methods
    铁路程控共线电话设备 汇接机技术要求及试验方法
    China Railway & Train Standards
    telephone

    English PDF
    TB/T 2997.2-2000 Railway programmed collinear the telephone equipment collinear phone technical requirements and test methods
    铁路程控共线电话设备 共线话机技术要求及试验方法
    China Railway & Train Standards
    telephone

    English PDF
    TB/T 2997.1-2000 Railway programmed collinear telephone equipment master the technical requirements and test methods
    铁路程控共线电话设备 主控机技术要求及试验方法
    China Railway & Train Standards
    telephone

    English PDF
    TB/T 2996-2000 Technical requirements and test method for digital concentrated telephone units
    数字式电话集中机技术要求及试验方法
    China Railway & Train Standards
    telephone

    English PDF
    SJ 20737-1999 General specification for command telephone system on shipboard
    舰船指挥电话系统通用规范
    China Electronics Standards
    telephone

    English PDF
    YDN 115.3-1999 Test specification for China intelligent network services (Vote of telephone service) (internal standard)
    中国智能网业务测试规范(电话投票业务)
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 1006-1999 A simultaneous voice plus data modem, operating at a voice plus data signalling rates of 4 800bits/s, with optional automatic switching to data-only signalling rates of up to 14 400bit/s, for use on the general switched telephone network and on leased poi
    在公用电话交换网上和点对点二线租用电话型电路上同时传送语音和数据的调制解调器
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 1004-1999 Technical specifications and test methods of multi-port telephone accounting system
    多路电话计费系统技术要求及测试方法
    China Telecommunication Standards
    telephone

    English PDF
    JJG(YD)049-1999 telephone network simulator
    China Metrological Standards
    telephone

    English PDF
    YD/T 514-1998 Technical requirements and test methods for interface between non-voice subscriber terminal and public telephone network
    非话用户终端设备与公用电话网接口技术要求和测试方法
    China Telecommunication Standards
    telephone

    English PDF
    TB/T 2925-1998 (Long-distance railway manual telephone exchange equipment technical conditions cordless)
    铁路长途人工电话无绳式交换设备技术条件
    China Railway & Train Standards
    telephone

    English PDF
    YDN 088-1998 (Automatically Switched telephone (digital) network technology system (internal standard))
    自动交换电话(数字)网技术体制
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 945-1998 Modem operating at data signalling rates of up to 33600 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits
    公用电话交换网和点对点二线专线电路上使用的数据信号速率高达33600bit/s的调制解调器
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 579-1997 The specifications for coin box telephone set
    投币电话机技术条件
    China Telecommunication Standards
    telephone

    English PDF
    SJ 20628-1997 General specification for military recording telephones
    通用型军用计算机信息安全技术要求
    China Electronics Standards
    telephone

    English PDF
    SJ 20648-1997 Terminology for military digital secure automatic telephone network
    军用数字保密自动电话网术语
    China Electronics Standards
    telephone

    English PDF
    YDN 030.2-1997 Code number and dialing procedure of universal personal telecommunication, wide area Centrex switch (WAC), vote of telephone (VOT) and mass calling (MAS) services (internal standard)
    通用个人通信(upt)、广域集中用户交换机(wac)、电话投票(vot)和大众呼叫(mas)的编号和拨号程序
    China Telecommunication Standards
    telephone

    English PDF
    YDN 030.1-1997 Implications and process of universal personal telecommunication, wide area Centrex switch (WAC), vote of telephone (VOT) and mass calling (MAS) services (internal standard)
    通用个人通信(upt)、广域集中用户交换机(wac)、电话投票(vot)和大众呼叫(mas)的业务含义和流程
    China Telecommunication Standards
    telephone

    English PDF
    SJ 20653-1997 Key distribution center (KDC) interface of the military digital secure automatic telephone network
    军用数字保密自动电话网密钥分配中心接口
    China Electronics Standards
    telephone

    English PDF
    SJ 20652-1997 Technical requirements for verbal explanation of the military digital secure automatic telephone network
    军用数字保密自动电话网语音编解技术要求
    China Electronics Standards
    telephone

    English PDF
    SJ 20651-1997 Cryptographic protocol for the military digital secure automatic telephone network
    军用数字保密自动电话网加密协议
    China Electronics Standards
    telephone

    English PDF
    SJ 20650-1997 Interoffice common channel signaling in the military digital secure automatic telephone network
    军用数字保密自动电话网局间共路信令
    China Electronics Standards
    telephone

    English PDF
    SJ 20649-1997 Subscriber loop signaling in the military digital secure automatic telephone network
    军用数字保密自动电话网用户环路信令
    China Electronics Standards
    telephone

    English PDF
    YD/T 588-1996 Basic requirement for ability of telephone online audio modem to withstand transmission impairments
    电话网上音频调制解调器承受传输损伤能力的基本要求
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 840-1996 telephone subscriber indoor copper-conductor wires
    电话网用户铜芯室内线
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 772-1995 Technical requirement and test method for networking of group telephone equipment
    集团电话进网技术要求和检测方法
    China Telecommunication Standards
    telephone

    English PDF
    SJ/T 10664-1995 Technical requirements and measuring methods for electromagnetic compatibility of telephone terminal
    电话终端的电磁兼容性技术要求及测量方法
    China Electronics Standards
    telephone

    English PDF
    SJ/T 10651-1995 Methods of test for toll manual telephone switching equipment
    长途人工电话交换设备测试方法
    China Electronics Standards
    telephone

    English PDF
    TB/T 1691-1995 (Switched telephone Network Rail DC signal between the way)
    铁路电话交换网所间直流信号方式
    China Railway & Train Standards
    telephone

    English PDF
    TB/T 1693-1995 (Railway signal interface switched telephone network of automatic telephone exchange)
    铁路电话交换网 自动电话交换机的信号接口
    China Railway & Train Standards
    telephone

    English PDF
    YD/T 751-1995 Test method for networking of digital office telephone exchange equipment in public telephone network
    公用电话网局用数字电话交换设备进网检测方法
    China Telecommunication Standards
    telephone

    English PDF
    YD 5010-1995 (Urban residential area architectural design and installation of telephone communications Atlas)
    城市居住区建筑电话通信设计安装图集
    China Telecommunication Standards
    telephone

    English PDF
    JJG(YD)032-1995 (Dual-tone multi-frequency telephone tester test procedures)
    China Metrological Standards
    telephone

    English PDF
    TB/T 2500-1994 (Wayside telephone equipment (wired) standard series and the main technical conditions)
    铁路区间电话设备(有线)制式 系列及主要技术条件
    China Railway & Train Standards
    telephone

    English PDF
    TB/T 1723-1994 (Switched telephone Network Rail and ringing tones)
    铁路电话交换网铃流及信号音
    China Railway & Train Standards
    telephone

    English PDF
    SJ/T 10561-1994 Type designation system for carrier telephone communication equipment
    载波电话通信设备型号命名方法
    China Electronics Standards
    telephone

    English PDF
    SJ/T 10560-1994 Type designation system for private telephone equipment
    专用电话设备型号命名方法
    China Electronics Standards
    telephone

    English PDF
    SJ/T 10559-1994 Type designation system for telephone switchboards
    电话交换机型号命名方法
    China Electronics Standards
    telephone

    English PDF
    SJ/T 10558-1994 Type designation system for telephone sets
    电话机型号命名方法
    China Electronics Standards
    telephone

    English PDF
    YD/T 722-1994 polyolefin insulated, PVC sheathed, parallel-twin copper-clad steel wires for telephone subscribers communication
    聚烯烃绝缘聚氯乙烯护套平行双芯铜包钢电话用户通信线
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 696-1993 Requirement for networking of cordless telephone sets
    无绳电话机进网要求
    China Telecommunication Standards
    telephone

    English PDF
    JJG(YD)021-1994 Specification for verification of testers of telephone dial
    China Metrological Standards
    telephone

    English PDF
    JJG(YD)019-1994 Specification for verification of telephone channel tester
    China Metrological Standards
    telephone

    English PDF
    TB 10216-1994 Code for construction of railway SPC digital telephone switching engineering
    China Railway & Train Standards
    telephone

    English PDF
    YD/T 638.14-1993 Type designation system for telephone sets
    电话机型号命名方法
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 638.13-1993 Type designation for accessory equipments of telephone exchange
    电话交换附属设备型号命名方法
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 638.5-1993 Type designation system for telephone switchboards
    电话交换机型号命名方法
    China Telecommunication Standards
    telephone

    English PDF
    TB/T 1692-1993 (Switched telephone Network Rail multifrequency register signaling mode)
    铁路电话交换网 多频记发器信号方式
    China Railway & Train Standards
    telephone

    English PDF
    TB/T 1690-1993 (Railway switched telephone network digital line signaling)
    铁路电话交换网 数字型线路信号方式
    China Railway & Train Standards
    telephone

    English PDF
    TB/T 1689-1993 (Railway switched telephone network with a single-frequency pulse line signaling)
    铁路电话交换网 带内单频脉冲线路信号方式
    China Railway & Train Standards
    telephone

    English PDF
    TB/T 1688-1993 (Railway signaling switched telephone network users)
    铁路电话交换网 用户信号方式
    China Railway & Train Standards
    telephone

    English PDF
    TB/T 2317-1992 (Setup and routing railway between phones switched telephone network circuits)
    铁路电话交换网电话所间电路的设置和路由选择
    China Railway & Train Standards
    telephone

    English PDF
    SJ/T 10126-1991 Specification for carrier telephone terminal equipement with 12 channels open-wire cables for Type 12ZD-16
    12zd-16型明线电缆12路载波电话终端机技术条件
    China Electronics Standards
    telephone

    English PDF
    SJ/T 10122-1991 Wireless portable telephone for JXD-37
    jxd-37型袖珍式无线电话机
    China Electronics Standards
    telephone

    English PDF
    XF 14-1991 Technical requirements and test methods for radiotelephones for fire protection {译}
    消防用无线电话机技术要求和试验方法
    China Fire industry Standards
    telephone

    English PDF
    TB 2179.5-1991 (Railway telephone network data communication interface. Electrical characteristics for balanced double circuit is generally in the field of data communications equipment used in conjunction with an integrated circuit)
    China Railway & Train Standards
    telephone

    English PDF
    TB 2179.4-1991 (Railway telephone network data communication interface. In the field of data communications usually Electrical characteristics for unbalanced double interface integrated circuit devices used in conjunction with)
    China Railway & Train Standards
    telephone

    English PDF
    TB 2179.3-1991 (Railway telephone network data communication interface. Electrical characteristics for unbalanced double interface circuit)
    China Railway & Train Standards
    telephone

    English PDF
    TB 2179.2-1991 (Railway telephone network data communication interface data terminal equipment and data circuit terminating equipment interface circuit between the definition table)
    China Railway & Train Standards
    telephone

    English PDF
    YD 344-1990 Requirements for PABXs access to public telephone switching network
    自动用户交换机进网要求
    China Telecommunication Standards
    telephone

    English PDF
    TB 2130.6-1990 (Train dispatching telephone. Extension technical requirements and test methods)
    China Railway & Train Standards
    telephone

    English PDF
    TB 2130.2-1990 (Train dispatching telephone switchboard. Test methods)
    China Railway & Train Standards
    telephone

    English PDF
    YD/T 577-1992 Jack and Plug For Indoor telephone
    室内电话机插头座
    China Telecommunication Standards
    telephone

    English PDF
    TB/T 2088-1989 (Railway switched telephone network transmission attenuation)
    China Railway & Train Standards
    telephone

    English PDF
    TB 1426-1983 (Railway station wired telephone equipment standard series)
    China Railway & Train Standards
    telephone

    English PDF
    YD/T 548-1992 The specification and test methods for conference telephone SET
    会议电话分机技术要求及测试方法
    China Telecommunication Standards
    telephone

    English PDF
    YD/T 547-1992 The specification and test methods for conference telephone tandem board
    会议电话汇接机技术要求及测试方法
    China Telecommunication Standards
    telephone

    English PDF

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