1、STD-CEPT TIR 52-02 E-ENGL 2992 m 2326424 00L4b94 974 m T/R 5241 E Page 1 Disiribution: B Recommendation T/R 52-01 (Athens 1990) DESIGNATION OF A HARMONISED FREQUENCY BAND FOR MULTIPOINT VIDEO DISTRIBUTION SYSTEMS IN EUROPE Recommendation proposed by the ”Frequency Management” Working Group TIWG 18 (
2、FM) Text of the Recommendation adopted by the ”European Radiommunications Committee” (ERC): The European Conference of Postal and Telecommunications Administrations, INTRODUCTION Television-programme distribution by microwave can be achieved by means of a so-called Multipoint Video Distribution Syst
3、em (MVDS). A typical MVDS consists of a microwave transmitter connected to an omni- directional or sector antenna, which covers a cpecific area or “cell”, and a number of receivers located at the subscribers premises at fixed locations. The system transmits a large number of channels (typically 20)
4、via microwave to the individual subscriber. in some countries an MVDS is regarded as an alternative to cable television distribution networks, in others it is considered an extension to these networks. A harmonised frequency band for MVDS in Europe allows quick technical development of equipment for
5、 it. The CEPT, considering that 1. 2. 3. 4. 5. 6. 7. 8. 9. in Europe MVDS should have the capability to distribute at least 20 channels in order to provide an equivalent service to cable networks, an AM system employs an 8 h4Hz channel spacing, whereas an FM system also capable of transporting H-MAC
6、 signals requires a channel spacing of about 40 MHz, thus per cell at least 160 or 800 MHz bandwidth should be available depending on the modulation method chosen, more fiequency blocks are required for fiequency coordination between ells, the resulting large bandwidths cannot be made available thro
7、ughout Europe in the lower frequency ranges and thus a selection has to be made considering the higher frequency bands only, the choice for the higher frequency bands necessitates the use of FM and involves specific problems such as the short range covered (with current technology less ihm 5 kilomet
8、res) and that therefore, in general, systems used for the extension of cable networks can successiUy use this part of the spectrum, several frequency bands in the higher frequency range have been suggested such as the 29, 38, 42 and 60 GHz bands, hat the lowest of these bands potentially offer the h
9、ighest performance while the highest is unsuitable because of the very limited range (less than 1 kilometre), the 40.5-42.5 GHz band has been allocated by the ITU on a primary basis to the broadcasting-satellite service, on a permitted basis to the broadcasting service and on a secondary basis to th
10、e xe and mobile services, no systems are operational or planned, and that satellitebroadcasting systems are not expected to be operational in this band before the year 2010, the band 40.5-42.5 GHZ offers a sufficient amount of spectrum for MVDS, EditionofJanuary 31, 1991 STDoCEPT TIR 52-01 E-ENGL 19
11、91 W 2326414 0034695 800 - T/R 52-01 E Page 2 noting that in some countries there is a need to use substantially lower frequency bands for systems which have to provide a much Wider coverage, recommends that the band 40.5-42.5 GHz shall be the hannonised frequency band for Multipoint Video Distribut
12、ion Systems in Europe.” Edition of January 31,1991 -r/R 52-01 Designation of a harmonised frequency band for multipoint video distribution systems in Europe Adm Imp1 Remarks AUT Yes Until now no request BEL No CZE Planned D IYes I I I DNK I Planned I E No EST Under Study FIN Yes G Yes GRC Planned HNG Planned HOL Yes HRV Planned I Planned IRL Planned ISL Yes LIE Yes NOR Yes POL Planned POR Yes ROU Yes 40 GHz band not suitable for wide area MVDS s Ives I SUI I Yes I SVN Planned TUR Yes Regulation on radio frequency bands in the Republic of Slovenia
