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YD/T 2742-2014 分组数字微波通信设备和系统技术要求及测试方法 Technical requirements and testing method for packet digital microwave communication equipments and systems
本标准规定了分组数字微波设备的分组特性(包含分组QoS、OAM、保护和时钟处理等)、业务接口、系统特性(包含自适应调制、射频特性等)、环境适应性、安全符合性、电磁兼容等技术要求和测试方法。<br />本标准适用于全室内分组数字微波设备、分体式分组数字微波设备和全室外分组数字微波设备。...
2024-01-30 21:30:01浏览:6
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UL 444 BULLETIN/2-2018 Ul Standard For Safety Communications Cables (Comments Due: April 23, 2018)
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2024-01-30 12:15:02浏览:8
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YD/T 1058-2015 通信用高频开关电源系统 High frequency switch-mode power supply for communications
本标准规定了通信用高频开关电源系统(以下简称系统)的组成、系列、要求、试验方法、检验规则、标志、包装、运输和储存。<br />本标准适用于直流输出电压标称值为一48V(24V)的通信用高频开关电源系统。...
2024-01-23 19:00:02浏览:6
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YD/T 2637.5-2013 自组织网络支持应急通信 第5部分: 与现有网络的互联互通 Ad hoc networks for emergency communications Part 5: requirements of interconnection with legacy networks
本部分规定了支持应急通信的自组织网络与现有网络互联互通的场景、接口和协议的要求。<br />本部分适用于采用无线局域网(IEEE 802.11a/b/g/n/s)和无线城域网(IEEE 802.16a/d/m)技术进行组网的支持应急通信的自组织网络与现有网络(主要指互联网)互联互通的设备。...
2024-01-23 07:24:01浏览:8
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IEC 62209-2-2019 人体接触射频领域从手持body-mounted无线通信设备,人体模型,仪表,和程序--第2部分:过程来确定特定吸收率(SAR)为无线通信设备中使用靠近人体(30 MHz到6 GHz的频率范围) Human exposure to radio frequency fields from hand-held and body-mounted wireless communication devices – Human models, instrumentation
This part of IEC 62209 series is applicable to any wireless communication device capable of <br />transmitting electromagnetic fields (EMF) intended to be used at a position near the human <br />body, in the manner described by the manufacturer, with the radiating part(s) of the device at <br />distances up to and including 200 mm from a human body, i.e. when held in the hand or in <br />front of the face, mounted on the body, combined with other transmitting or non-transmitting <br />devices or accessories (e.g. belt-clip, camera or Bluetooth add-on), or embedded in <br />garments. For transmitters used in close proximity to the human ear, the procedures of <br />IEC 62209-1:2005 are applicable. <br />This standard is applicable for radio frequency exposure in the frequency range of 30 MHz to <br />6 GHz, and may be used to measure simultaneous exposures from multiple radio sources <br />used in close proximity to human body. Definitions and evaluation procedures are provided for <br />the following general categories of device types: body-mounted, body-supported, desktop, <br />front-of-face, hand-held, laptop, limb-mounted, multi-band, push-to-talk, clothing-integrated. <br />The types of devices considered include but are not limited to mobile telephones, cordless <br />microphones, auxiliary broadcast devices and radio transmitters in personal computers. <br />This International Standard gives guidelines for a reproducible and conservative <br />measurement methodology for determining the compliance of wireless devices with the SAR <br />limits. <br />Because studies suggest that exclusion of features to represent a hand in human models <br />constitutes a conservative case scenario for SAR in the trunk and the head, a representation <br />of a hand is not included if the device is intended to be used next to the head or supported on <br />or near the torso [73], [80]. This standard does not apply for exposures from transmitting or <br />non-transmitting implanted medical devices. This standard does not apply for exposure from <br />devices at distances greater than 200 mm away from the human body. <br />IEC 62209-2 makes cross-reference to IEC 62209-1:2005 where complete clauses or <br />subclauses apply, along with any changes specified....
2024-01-19 03:36:02浏览:14
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NB/T 10132-2019 水电工程通信设计内容和深度规定 Regulation on Content and Depth of Communication Design for Hydropower Projects
本规定适用于新建、改建、扩建水电工程的通信设计。...
2024-01-19 00:48:01浏览:14
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ISO 11783-3-2018 农林拖拉机和机械--串行控制和通信数据网--第3部分:数据链路层 Tractors and machinery for agriculture and forestry — Serial control and communications data network — Part 3: Data link layer
This document specifies the application, the network layer protocols and the mapping to the controller area network (CAN) data link layer protocol as specified in ISO 11898-1. The application layer specifies protocol data units (PDU), which can be mapped to Classical CAN data frames using the Classical Extended Frame Format (CEFF). For PDUs exceeding the length of the CEFF-formatted data frames, this document specifies transport layer protocols and the mapping to CEFF-formatted data frames....
2024-01-19 00:24:01浏览:8
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ITU-R M.2418-2017 Description of Railway Radiocommunication Systems between Trainand Trackside (RSTT)
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2024-01-18 12:12:01浏览:8
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YDB 071.1-2011 通信电源和机房环境节能技术指南 第1部分:总则 Guide for energy saving technology of power supply and Room environment for telecommunications Part 1:General Rules
本部分规定了通信电源和机房环境节能总体要求,包括:节能原则、通信电源节能要求、空调节能要求和通信机房环境节能要求。<br />本部分适用于通信电源和通信机房环境的节能。...
2024-01-18 06:00:01浏览:7
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YD/T 2323-2016 通信配电系统电能质量补偿设备 Power quality compensator for telecommunication power distribution system
本标准规定了380V低压并联型电能质量补偿设备的定义、分类、技术要求、试验方法、检验规则、标志、包装、运输、储存等。<br />本标准适用于通信le电系统中的380V低压并联型电能质量补偿设备。...
2024-01-14 19:48:01浏览:10
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IEC TS 62056-8-20-2016 电能测量数据交换--DLMS/COSEM程序组--第8-20部分:邻域网络通信协议集 Electricity metering data exchange - The DLMS/COSEM suite - Part 8-20: Mesh communication profile for neighbourhood networks
This part of IEC 62056 specifies a DLMS/COSEM communication profile that can be used in a smart metering system in which the Neighbourhood Networks (NN) are mesh networks. <br />This profile may be considered as an adaptation and extension of the UDP/IP communication profile specified in IEC 62056-9-7:2013. As in that standard, the PHY and MAC layers are out of the Scope. <br />This Technical Specification specifies a number of features essential to the efficient operation of a large scale AMI using mesh NNs. These features include: <br />• identification of the DLMS/COSEM client and server participating in an application association (AA) with their system title, so that this identification does not change when the IP address of the server changes, see Clause 6; <br />• a mechanism to inform the client of the binding between the server’s system title and its current IP address(es), see 5.5.3; <br />• the use of the DLMS/COSEM UDP based transport layer, that allows keeping <br />DLMS/COSEM AAs open for long periods, while the device may leave and join the mesh NN and/or its IP address may change, see 7.2.2; <br />• DLMS/COSEM application layer and application process level security features that can be used in a mesh environment, see 7.4.2; <br />• a mechanism to organize servers to one or more groups based on various conditions, so that the requests can be broadcasted to all devices attached to the mesh network, but only those servers belonging to the group carry out the request and respond, see 8.2; <br />• a mechanism that allows to send the response to a request in designated time windows and with a randomized delay, see 8.3. <br />• the use of a specific UDP port that allows efficient UDP header compression, see 6.3.3. <br />The Scope of this communication profile specification is restricted to aspects concerning the use of communication protocols in conjunction with the COSEM data model and the DLMS/COSEM application layer. Any project specific definitions of data structures and data contents may be provided in project specific companion specifications....
2024-01-14 19:12:02浏览:7
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