IEC 60728-101-2:2023 <p>电视信号、声音信号和交互式服务用电缆网络.第101-2部分:在全数字频道负载下运行的系统出口处传送的信号的性能要求</p>

标准编号：IEC 60728-101-2:2023

中文名称：

电视信号、声音信号和交互式服务用电缆网络.第101-2部分:在全数字频道负载下运行的系统出口处传送的信号的性能要求

英文名称：

Cable networks for television signals, sound signals and interactive services - Part 101-2: Performance requirements for signals delivered at the system outlet in operation with all-digital channels load

发布日期：2023-06-07

标准范围

IEC 60728-101-2:20 23提供了在系统出口或终端输入处运行时要满足的最低性能要求，并描述了接收信号和CATV/MATV/SMATV电缆网络（包括单个接收系统）产生的信号中存在的损伤的求和标准。在被划分为公寓楼的建筑物中，由天线接收的信号由MATV/SMATV电缆网络分配到家庭网络接口（HNI）；然后，电视信号由各种类型的家庭网络(HN)分配(在家庭内部)直到系统插座或终端输入。电缆网络可以支持从系统出口（或终端输入）到前端的双向操作。家庭网络可以使用同轴电缆、平衡对电缆、光纤电缆（玻璃或塑料）以及房间（或少量相邻房间）内的无线链路来代替有线电缆。IEC 60728的这一部分仅限于从天线接收的下行TV广播信号，并且适用于用于在大约5MHz和3300 MHz之间工作的电视信号、声音信号和交互式服务的电缆网络。对于在使用5GHz至6GHz频带的房间（或少量相邻房间）内用无线双向通信取代有线电缆的家庭分配技术，频率范围扩展到6 000 MHz。一般CATV/MATV/SMATV系统的主要部分，表示IEC 60728-101系列文件中注明相关性能要求的部分。-在IEC 60728-101:2016第6条中给出了在头端接收的信号的要求。-IEC 60728中给出了CATV/MATV/SMATV电缆网络的要求，假设头端输入端的输入信号未受损，直至系统插座？101:2016年，第5条。-IEC 60728-101:2016第7条中给出了直到家庭网络接口(HNI)的CATV/MATV/SMATV电缆网络的要求，假设在头端的输入处的输入信号未受损。-IEC 60728-101-1:20 23第5条中给出了从HNI到系统插座或端子输入的具体要求，假设HNI处的输入信号未受损。-运行中系统出口的要求见本文件第6条。表述“在操作中”是指接收到的信号及其损伤被施加到CATV/MATV/SMATV电缆网络的头端输入端。因此，通过对系统的各个级联部分和输入信号的损伤求和，得出“运行中”系统出口的要求。当信号格式从数字到数字(例如，从QPSK到QAM)(例如，如在ETSI EN 300 473中)或从数字到模拟(例如，从DVB-S/S2到AM-VSB或DVB-T/T2到AM-VSB)的改变在头端进行时，在系统出口产生要求放松的损伤的总和不适用。这种情况将是在头端输入处施加的未受损信号的等效性。因此，IEC 60728中给出的系统出口要求？1申请。本文件还为测量下行电缆网络运行特性的基本方法提供了参考，以评估其性能。除非另有说明，否则所有要求是指在任何系统出口端接在等于系统标称负载阻抗的电阻上时在运行中要达到的性能极限。在不使用系统插座的情况下，上述规定适用于端子输入。如果使用不同的传输介质(例如同轴电缆、平衡电缆、光缆、无线链路)将家庭网络细分为多个部分，本文件还提供了对退化累积的限制。本国际标准将与IEC 60728-101:2016结合使用。

IEC 60728-101-2:2023 provides the minimum performance requirements to be fulfilled in operation at the system outlet or terminal input and describes the summation criteria for the impairments present in the received signals and those produced by the CATV/MATV/SMATV cable network, including individual receiving systems.
In a building divided into apartment blocks, the signals received by the antennas are distributed by the MATV/SMATV cable network up to the home network interface (HNI); the television signals are then distributed (inside the home) by home networks (HN) of various types up to the system outlet or terminal input. The cable network can support two-way operation, from the system outlet (or terminal input) towards the headend.
The home network can use coaxial cables, balanced pair cables, fibre optic cables (glass or plastic) and also wireless links inside a room (or a small number of adjacent rooms) to replace wired cords.
This part of IEC 60728 is limited to downstream TV broadcast signals received from antennas and is applicable to cable networks intended for television signals, sound signals and interactive services operating between about 5 MHz and 3 300 MHz. The frequency range is extended to 6 000 MHz for home distribution techniques that replace wired cords with a wireless two-way communication inside a room (or a small number of adjacent rooms) that uses the 5 GHz to 6 GHz frequency band.
The main sections of a general CATV/MATV/SMATV system, indicating the parts of the IEC 60728-101 series documents where the relevant performance requirements are indicated.
- The requirements for the signals received at the headend are given in IEC 60728-101:2016, Clause 6.
- The requirements for the CATV/MATV/SMATV cable network, assuming an unimpaired input signal at the input of the headend, up to the system outlet are given in IEC 60728？101:2016, Clause 5.
- The requirements for the CATV/MATV/SMATV cable network up to the home network interface (HNI) are given in IEC 60728-101:2016, Clause 7, assuming an unimpaired input signal at the input of the headend.
- The specific requirements from HNI to the system outlet or terminal input are given in IEC 60728-101-1:2023, Clause 5, assuming an unimpaired input signal at the HNI.
- The requirements at the system outlet in operation are given in Clause 6 of this document.
The expression "in operation" means that the received signals, with their impairments, are applied to the headend input of the CATV/MATV/SMATV cable network. The requirements at the system outlet "in operation" are derived, therefore, by summing the impairments of the various cascaded parts of the system and of the input signal.
When a change of signal format from digital to digital (e.g. from QPSK to QAM) (e.g. as in ETSI EN 300 473) or from digital to analogue (e.g. from DVB-S/S2 to AM-VSB or DVB-T/T2 to AM-VSB) is made at the headend, the summation of the impairments that produce a relaxation of requirements at system outlet does not apply. Such a case will be the equivalence of unimpaired signals applied at the headend input. Therefore, the requirements at system outlet given in IEC 60728？1 apply.
This document also provides references for the basic methods of measurement of the operational characteristics of the downstream cable network in order to assess its performance.
All requirements refer to the performance limits to be achieved in operation at any system outlet when terminated in a resistance equal to the nominal load impedance of the system, unless otherwise specified. Where system outlets are not used, the above applies to the terminal input.
The present document also provides limits for the accumulation of degradations if the home network is subdivided into a number of parts, using different transmission media (e.g. coaxial cabling, balanced cabling, optical cabling, wireless links).
This International Standard is to be used in conjunction with IEC 60728-101:2016.

标准预览图