1、STDmITU-R RECMN F-70L-Z-ENGL 1997 m q855212 0531097 3Tb m Rec. ITU-R F.701-2 359 RECOMMENDATION ITU-R F.701-2 RADIO-FREQUENCY CHANNEL ARRANGEMENTS FOR ANALOGUE AND DIGITAL POINT-TO-MULTIPOINT RADIO SYSTEMS OPERATING IN FREQUENCY BANDS IN THE RANGE 1.350 TO 2.690 GHz (1.5,1.8,2.0,2.2,2.4 AND 2.6 GHz)
2、 (Question ITU-R 125/9) ( 1990- 1994- 1997) The ITU Radiocommunication Assembly, considering a access to telephone and other telecommunication subscriber services in rural and remote areas of many countries; that both analogue and digital point-to-multipoint microwave systems are now widely used to
3、provide wireless b) 2.690 GHz as established by administrations; that many of these systems are operating in a number of specific frequency bands between 1.350 and c) point-to-multipoint (P-MP) systems; that some administrations permit sharing of certain of these frequency bands between point-to-poi
4、nt (P-P) and d) tions ITU-R F.283, ITU-R F.382, ITU-R F.746, ITU-R F.1098, -R F.1242 and ITU-R F.1243; that the radio-frequency (RF) channel arrangements for fixed radio systems are given in Recommenda- e) width of the band available; that efficient use of bands of different width can be achieved by
5、 RF channel arrangements matched to the f) selecting all channel centre frequencies from a uniform basic pattern; that a high degree of compatibility between RF channels of different arrangements could be achieved by g) be chosen by non-occupancy of a suitable number of RF-channel positions in a hom
6、ogeneous basic pattern; that the centre gaps of the individual channel arrangements and the guard spacing at the edges of the band can h) positions too high) nor so large as to jeopardize efficient use of the available spectrum; that the uniform basic pattern spacing should not be unjustifiably smal
7、l (.e. the number of RF-channel j) that the absolute frequencies of the basic pattern should be defined by a single reference frequency, recommends 1 that the preferred RF channel arrangement for P-MP radio-relay systems carrying of the order of 10 to 120 telephone channels or a bit rate of the orde
8、r of 1 to 8 Mbit/s or the equivalent and operating in the frequency bands between 1.350 and 2.690 GHz should, if practicable, be the same as the corresponding arrangements for P-P radio-relay systems; 2 arrangements should be selected from a pattern with the following characteristics: that if it is
9、not practicable to use the same channel arrangements as for P-P radio-relay systems, the channel centre frequencies, fn, of the radio-frequency channels within the basic pattern: fn = fR - 0.5 m MHz where: m : fR reference frequency; integer whose maximum value depends on the available frequency ban
10、d COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLicensed by Information Handling ServicesSTD-ITU-R RECMN F.701-2-ENGL 1997 4855212 0531098 232 360 Rec. ITU-R F.701-2 3 frequencyfR (see Notes 1 and 2): that these arrangements be applicable to the following frequency bands wi
11、th the stated values of reference Frequency band (MW 1350-1 530 1 700-1 900 1900-2 100 2 100-2 300 2 300-2 500 2 500-2 690 fR Notes MHz) 1530 4 1 900 5and6 2 100 5,6 and 7 2 300 5,6,7 and 8 2 500 3,8 and 9 2 690 Sand8 4 that the channel spacing XS, the centre gap YS, the guard spaces ZS1 and ZS2, an
12、d antenna polarization should preferably be chosen to allow P-MP radio systems to coexist with P-P systems operating on channel plans described in Recommendations ITU-R F.283, ITU-R F.382, ITU-R F.746, IT-R F.1098, ITU-R F.1242 and ITU-R F.1243, and should be agreed between the administrations conce
13、rned (see Note i); 5 that the alternated or Co-channel arrangement plan should be used, examples of which are shown in Fig. 1. FIGURE 1 Examples of channel arrangements based on 0 1,2 and 3 2 N 2 N Uniform basic spacing = 0.5 MHz NOTE 1 - It is recognized that some administrations have developed fre
14、quency channel arrangements that differ from this Recommendation inasmuch as ZS1, ZS? and YS were not always integer multiples of the channel spacing XS. NOTE 2 - Some administrations have selectedf, to be a frequency other than those shown in recommends 3. NOTE 3 - A frequency channel arrangement f
15、or fixed radio systems in this band is described in Recommenda- tion ITU-R F.746. COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLicensed by Information Handling ServicesSTD-ITU-R RECMN F.701-2-ENGL 1997 W V855212 0531099 179 Rec. ITU-R F.701-2 361 NOTE 4 - Frequency channel
16、 arrangements for fixed radio systems in this range are described in Recommenda- tion ITU-R F.1242. NOTE 5 - Frequency channel arrangements for fixed radio systems in these bands are described in Recommenda- tion EU-R F.283. NOTE 6 - Frequency channel arrangements for fixed radio systems in these ba
17、nds are described in Recommenda- tion ITU-R F.382. NOTE 7 -Frequency channel arrangements for fixed radio systems in these bands are described in Recommenda- tion ITU-R F. 1098. NOTE 8 - Frequency channel arrangements for fixed radio systems in these bands are described in Recommenda- tion ITU-R F.1
18、243. NOTE 9 - The band 2 400-2 500 MHz (centre frequency 2 450 MHz) is designated for industrial, scientific and medical (ISM) applications. Radio services in this band must accept harmful interference caused by these applications. COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLicensed by Information Handling Services
