IEC 60728-113:2018 pdf download

IEC 60728-113:2018 pdf download.Cable networks for television signals, sound signals and interactive services
1 Scope
This part of IEC 60728 is applicable to optical transmission systems for broadcast signal transmission that consist of headend equipment, optical transmission lines, in-house wirings and system outlets. These systems are primarily intended for television and sound signals using digital transmission technology. This document specifies the basic system parameters and methods of measurement for optical distribution systems between headend equipment and system outlets in order to assess the system performance and its performance limits. In this document, the upper signal frequency is limited at about 1 000 MHz. For systems requiring more bandwidth, refer to IEC 60728-1 3-1 . The purpose of this part of IEC 60728 is to describe the system specifications of FTTH (fibre to the home) networks for digitally modulated broadcast signal transmission. This document is also applicable to broadcast signal transmission using a telecommunication network if it satisfies the optical portion of this document. This document describes RF transmission for fully digitalized broadcast and narrowcast (limited area distribution of broadcast) signals over FTTH, and introduces xPON system as a physical layer media. The detailed description of the physical layer is out of the scope of this document. The scope is limited to RF signal transmission over FTTH, thus, it does not include IP transport technologies, such as IP Multicast and associate protocols. Some interference descriptions between the telecommunication system and the broadcast system are addressed in Clause 7.
3 Terms, definitions, graphical symbols and abbreviated terms
Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 .1 optical transmitter transmitting fibre optic terminal device accepting at its input port an electrical signal and providing at its output port an optical signal modulated by that input signal Note 1 to entry: For the purposes of this document, optical transmitters can have more than one input port accepting electrical RF signals. Note 2 to entry: This piece of equipment amplifies frequency multiplexed electrical signals and converts these electrical signals into optical signals. The optical wavelength is a 1 500 nm band (1 550 ± 1 0 nm in the 1 530 nm to 1 625 nm range). [SOURCE: IEC TR 61 931 :1 998, 2.9.6, modified – Notes 1 and 2 have been added] 3.1 .2 optical receiver receiving fibre optic terminal device accepting at its input port a modulated optical signal, and providing at its output port the corresponding demodulated electrical signal (with the associated clock, if digital) Note 1 to entry: For the purposes of this document, optical receivers can have more than one output port providing electrical RF signals. [SOURCE: IEC TR 61 931 :1 998, 2.9.7, modified – Note 1 has been added] 3.1 .3 optical amplifier optical waveguide device containing a suitably pumped, active medium which is able to amplify an optical signal Note 1 to entry: There are several methods based on wavelength to be used for amplification. The term “Erbium Doped Fibre Amplifier (EDFA)” is the synonym of optical amplifier in this document. [SOURCE: IEC TR 61 931 :1 998, 2.7.75, modified – Note 1 has been added.] 3.1 .4 splitter optical fibre device, possessing three or more optical ports, which shares optical power among its ports in a predetermined fashion, at the same wavelength or wavelengths, without wavelength conversion Note 1 to entry: The ports can be connected to fibres, detectors, etc. [SOURCE: IEC TR 61 931 :1 998, 2.6.21 , modified – The term “splitter” has been added, and “optical fibre branching device” and “optical fibre coupler” have been deleted.] 3.1 .5 WDM filter wavelength selecting device (used in WDM transmission systems) in which optical signals can be transferred between two predetermined ports, depending on the wavelength of the signal 3.1 .6 WDM coupler wavelength coupling device (used in WDM transmission systems) in which optical signals in different wavelengths can be coupled between two predetermined ports