1、CEPT T/R*20-01E 2326414 000b260 O 69 20-01 Page E 1 Recommendation T/R 20-01 (Interlaken 1968) (amended at Montreux 1970, Stockholm 1976 and Ostend 1979) OPERATION OF THE EUROPEAN RADIO-PAGING SERVICE Recommendation proposed by the “Radiocommunications” Working Group T/WG 3 Text of the revised Recom
2、mendation adopted by the “Telecommunications” Commission: “The European Conference of Postal and Telecommunications Administrations, considering - that the introduction of a European radio-paging system is imminent in several CEPT countries, - that this introduction raises a number of operational pr
3、oblems, - that experience is already available from Administrations operating a paging service, - that propagation tests have been carried out by various Administrations in order to determine the risk of interference, recommends 1. 2. 3. 3.1. 3.2. 4. 5. 6. that Administrations wishing to establish a
4、 radio network within the European paging system should take into account the number and geographical limits of the base networks indicated in Annex 1 to this Recommenda- tion, bearing in mind, when selecting the location and the power of transmitting stations, the interference which may be caused i
5、n other base networks, and should, where appropriate, carry out the necessary Co-ordination, that Administrations should resolve, by the normal procedure, cases of interference between base networks, between the paging service and other services, and interference in the paging service due to emissio
6、ns from industrial, scientific, medical and other installations. For the evaluation and reduction of interference, see Annex 2, that code numbers should be allocated in accordance with Annex 3 to this Recommendation, in which: the code numbers of subscribers wishing to be called in their country of
7、residence and in the CEPT member countries participating in the service are arranged in one particular group, the code numbers of subscribers wishing to be called in their country of residence only are allocated in such a way that the same first figure is given to all the code numbers for a given co
8、untry, that receivers in the European radio-paging service should comply with the provisions of Annex 4 to this Recommendation, that a central Ofice should be responsible: initially, for allocating blocks of code numbers to various countries, - subsequently, for centralising and disseminating all in
9、formation concerning planned networks and the and consequently, that the task of managing the central Ofice should be given, at least to begin with, to that the call exchanges in the European radio-paging service should conform to the provisions of Annex 5 to this Recommendation.” operation of the E
10、uropean paging service, a specific Administration, Edition of September 15, 1988 CEPT T/R*20-01E 232b414 000b2bL 2 i TIR 20-01 E Page 2 Annex 1 PLAN OF BASE NETWORKS AND ALLOCATION OF RADIO FREQUENCIES i 0: I Edition of September 15, 1988 CEPT T/R*ZO-OLE 232b4l14 000b2b2 4 TIR 20-01 E Page 3 Annex 2
11、 INTERFERENCE CAUSED BY TRANSMITTERS IN THE RADIO-PAGING SERVICE 1. EVALUATION OF INTERFERENCE For a first evaluation of interference, the curves given in CCIR Recommendation 370-1 (or curves commonly agreed between the Administrations concerned) should be used, together with the values indicated in
12、 CCIR Report 358. In the case of mutual interference between base networks in the radio-paging service, the protection ratios indicated in point 2.7 of the final report of the R6 subgroup (Report of the “Telecommunications” Commission, Rome 1967, pages 107 and 108) shall be observed. In critical cas
13、es, on-site measurements are recommended. 2. MEASURES FOR REDUCING INTERFERENCE Interference caused to other base networks or other services can be reduced: by covering a given area with several low-power transmitters rather than with one higher-power transmitter; - by placing a low-power transmitte
14、r in a high position rather than using a more powerful transmitter with an - by limiting, through the use of directional antennas, the effective power radiated towards regions in which Mutual interference between the VHF broadcasting service and the paging service can be reduced by placing the trans
15、mitters so that the ratio between the field intensities remains substantially the same throughout the area covered. Some of the measures suggested above are contradictory. The choice will take into account, in each case, the specific technical conditions and economic factors. antenna of lesser equiv
16、alent height; interference could occur. Edition of September IS. 1988 870,000 . 870,999 871,000 . 872,999 873,000 . 874,999 875,000 . 878,999 879,000 . 879,999 700,000 . 700,999 710,000 . 711,999 730,000 . 731,999 750,000 . 753,999 790,000 . 790,999 CEPT T/R*ZO-OLE 2326434 O006263 6 TIR 20-01 E Page
17、 4 Annex 3 Allocation of code number BLOCKS Blocks of numbers I 1st block of numbers Drovisionally reserved I definitel! illocated Country for national subscribers for international subscribers for international subscribers for national subscribers 1 2 3 I 4 5 8 10,OOO. 8 19,999 1 OO,OOO. 109,999 82
18、0,000 2329,999 200,000 . 209,999 -1- 830,000 . 839,999 300,000 . 309,999 810,000 . 8 10,999 820,000 . 820,999 Sermany Yreat Britain 100, OOO. 199,999 200,000 . 299,999 i taly/Vatican San Marino 300,000 . 399,999 830,000 . 830,999 400,000 . 499,999 840,000 . 849,999 I 400,000 . 409,999 840,000 ,840,9
19、99 France/Monaco Spain Portugal Yreece 500,000 . 559,999 560,000 . 579,999 580,000 ,599,999 500,000 . 505,999 560,000 . 561,999 580,000 . 581,999 850,000 . 850,999 856,000 . 856,999 858,000 . 858,999 850,000 . 855,999 856,000 . 857,999 858,000 . 859,999 Sweden Finland Denmark Norway iceland Cyprus B
20、e 1 g i u m Netherlands 600,000 .619,999 620,000 . 629,999 630,000 . 639,999 640,000. 649,999 650,000. 654,999 655, OOO. 659,999 660,000 . 679,999 680,000 . 699,999 860,000 . 861,999 862,000 362,999 863,000 ,863,999 864,000 ,864,999 865,000 . 865,999 865,O OO. 865,999 866,000 . 867,999 868,000 . 869
21、,999 600,000. 601,999 620,000. 620,999 630,000 . 630,999 640,000 .640,999 650,000 . 650,999 655, OOO. 655,999 660,000 . 661,999 680,000 . 681,999 860,000. 860,999 862,000 ,862,999 863,000 .863,999 864,000 .864,999 865,000 . 865,459 865,500 2365,999 866,000 . 866,999 868,000 . 868,999 Luxembourg Swit
22、zerland/ Liechtenstein 4ustria urkey ireland 700,000 . 709,999 710,000 . 729,999 730,000 . 749,999 750,000 . 789,999 790,000 . 799,999 870,000 . 870,999 87 1,000 . 87 1,999 873,000 . 873,999 875,000 . 875,999 879,000 . 879,999 National Extension )OO,OOO .099,999 )OO,OOO ,999.999 380,000 ,899,999 300
23、,000 . 809.999 International Extension Edition of September 15, 1988 CEPT T/R*ZO-OLE = 232b411i 000b2b4 8 T/R 20-01 E Page 5 Annex 4 TECHNICAL SPECIFICATIONS FOR THE “EUROSIGNAL” RECEIVER IN THE EUROPEAN RADIO-PAGING SERVICE 1. PURPOSE AND SCOPE OF THE SERVICE The purpose of the European radio-pagin
24、g service is to enable coded signals to be transmitted from public network telephones to mobile subscribers. To this end, the entire territory of the CEPT Administrations will be divided into 50 to 100 base radio networks. VHF transmitters covering a base network are linked to a call exchange where,
25、 among other things, the code signals are formed which modulate the call transmitters. If allowed by automatic trunk exchanges, telephone subscribers can directly transmit their calls by dialling the code number preceded by the call exchange code. A caller will be informed automatically that his cal
26、l has been accepted, by an announcement including the word “Eurosignal” followed by the name of the base network. The transmitted code signals are received by call receivers which analyse them. If the code received matches the code allocated to the decoder, an audible and a visual signal will be tri
27、ggered. The meaning of the coded signals has to be agreed between the radio-paging service subscriber and his callers. No possibility of direct reply by radio is provided. Consequently, the public telephone network will be used for any subsequent exchange of information. Since some subscribers may w
28、ish to receive several differentiated calls, their receivers will need to be allocated a corresponding number of codes. In order to make the decoders simple, the codes allocated to a given receiver should differ from each other only by the last digit, so that a maximum of 10 codes can be allocated t
29、o one receiver. However, Administrations may restrict this number. 2. TECHNICAL FACILITIES Three transmitting frequencies forming one channel shall be used in each base network. To prevent interference, the transmitters shall be sited so that a receiver tuned to the centre frequency F, of the channe
30、l can receive, at roughly equal field intensities, the emissions from no more than 3 transmitters operating respectively on the 3 frequencies Fa + 4 kHz, F, and Fa - 4 kHz. The centre frequencies of the 4 channels to be used in the European radio-paging service are shown in Annex 4.1 (page 12). They
31、 are positioned between 87.340 MHz and 87.415 MHz at a separation of 25 kHz. Unless otherwise stated, the median field intensity at the limits of the base network shall be at least 26 dB above 1 pV/m, or 14 dB above 1 pV/m in mountainous regions. The transmitters shall use amplitude modulation. They
32、 shall be modulated at the interval frequency (4 = 1153.1 Hz) between calls. The interval frequency and code signals are produced by the single call exchange for each base network. The code numbers used in the European radio-paging service consist of 6 digits (with a planned increase to 7 digits at
33、a later stage. This increase will not affect decoders in service at the time when it occurs). After receiving the complete series of pulses transmitted by the caller, the call exchange translates the series into a code signal. The signal consists of 6 elements. Each element is formed by transmission
34、 of a single frequency as specified in Annex 4.2 (page 13). Each signal is transmitted simultaneously by modulation circuits to all the transmitters in the base network. Edition of September 15, 1988 CEPT T/R*ZO-OLE M 232611311 000b2b5 T TIR 20-01 E Page 6 So long as the number of subscribers does n
35、ot go beyond one million, each digit from 0 to 9 will be represented by one of the frequencies f, to f9 (see Annex 4.2 page 131). If two consecutive digits in the number are identical, the second digit will be represented by a ?repetition frequency? (f, = 1062.9 Hz) to differentiate the consecutive
36、elements of the signal. For example, the code number: 33 55 56 is transmitted to the transmitter as the frequency series: Each signal element has a duration of 100 ms. The 6-element code is followed by a pause of at least 200 ms to enable the decoders to return to the off-position before the next ca
37、ll. The ?Eurosignal? receivers have a frequency switch and an indicating device to show whether the receiver sensitivity and field intensity are sufficient to guarantee call reception. The reception of a call is indicated by a short audible signal and activates a visual signal which continues to sho
38、w until the user intervenes. fi fr fs fr fs f 3. RECEIVER SPECIFICATIONS ?Eurosignal? receivers can be used in vehicles, as portable appliances and, if necessary, as fixed units. They shall comply with the following specifications : 3.1. Mechanical characteristics All monitoring, signalling and cont
39、rol devices shall be easily visible and readily accessible in operation. The receivers shall carry a rating plate? which must remain clearly visible ven if they are installed as fixed units. The rating plate shall contain the following information: Manufacturer?s name - Receiver type - Type-approval
40、 information, if any. The serial number and power supply particulars shall also be visible from the outside. The receivers shall be capable of operating under the special conditions obtaining in a travelling vehicle and of withstanding prolonged buffeting and vibration. They shall be capable of oper
41、ating during and after a 5-minute vibration test with a vibration amplitude of 1 mm and a frequency of 30 Hz at maximum (acceleration up to 3 g). It would be desirable if, in the design of the appliance, manufacturers took account of the most up-to-date facts known about vehicle passenger safety. Re
42、ceivers intended for use as portable appliances shall be capable of operating after being dropped three times from a height of 80 cm on to a wooden floor. The code number or numbers shall be indicated on the receiver in such a way that only authorised persons can obtain them. 3.2. Temperature Unless
43、 stated otherwise, the receivers shall meet these specifications at ambient temperatures between - 20? C and + 50? C. The receivers shall not suffer any lasting damage at ambient temperatures between - 30? C and + 70? C, whether or not they are being used. O Edition of September 15, 1988 CEPT T/R*20
44、-01E = 232b414 0006266 I TjR 20-01 E Page 7 3.3. Power supply The supply voltages are defined as follows: Nominal voltages: the voltages generally used, e.g. 6 volts, 12 volts, 24 volts, 110 volts and 220 volts. Working voltages: the voltages actually applied to the receiver in operation. When testi
45、ng the appliances in the laboratory, the following normal working voltages shall be applied: - for lead acid batteries, 2.1 volts per cell; - for other types of batteries, the voltage of a new battery of the type indicated by the manufacturer. Unless stated otherwise, the receivers shall meet these
46、specifications at working voltage variations of =t 15% relative to the nominal value. For integral batteries, the types and voltages in general use in Europe are recommended. Consumption should be as low as possible. It should be easy to replace or charge the power source. 3.4. Radio frequencies The
47、 receivers will be operating on channels 3 to 6 in Annex 4.1 (page 12). Receivers with an international code number shall be capable of operating on the 4 channels. Receivers with a national code number may only be equipped to operate on the frequencies of the base networks in which they are intende
48、d to receive calls, but they shall be easily adaptable to any one of the channels. Receivers equipped for two or more channels shall have a frequency switch. 3.5. Code numbers The receiver shall be fitted with a decoder permitting operation on one or more code numbers. The decoder shall be adaptable
49、 to any of the code numbers that may be allocated. Administrations shall take measures to prevent misuse of the receiver. This may be done by supplying the part fixing the code number or numbers as a removable component forming all or part of the decoder in accordance with the specifications of the Administrations concerned. The manufacturer will only supply this component if authorised by the Administration. Access to the decoder and the removable component shall be barred to subscribers. 3.6. Sensitivity 3.6.1. The sensitivity is defined as the minimum input e.m.f. ) of a signa
