PHỤ LỤC A
(Quy định)
ĐIỀU KIỆN ĐO KIỂM BÌNH THƯỜNG
● Nhiệt độ: +150C đến +350C
● Độ ẩm: 20% đến 75%
● Điện áp xoay chiều: 220 VAC/50 Hz
● Khi sử dụng nguồn cung cấp là ắc quy axit-chì, điện áp một chiều là 1,1 lần so với điện áp danh định.
PHỤ LỤC B
(Quy định)
ĐỘ KHÔNG ĐẢM BẢO ĐO TUYỆT ĐỐI VÀ XỬ LÝ KẾT QUẢ ĐO
B.1. Độ không đảm bảo đo tuyệt đối: giá trị cực đại
Tần số sóng mang
|
< ±1x10-7
|
Công suất sóng mang
|
< ±0,75 dB
|
Độ di tần cực đại
|
< ±5%
|
Độ nhạy máy thu tại SINAD 20 dB
|
< ±3 dB
|
Đặc tuyến biên bộ của máy thu
|
< ±1,5 dB
|
B.2. Xử lý, giải thích kết quả của phép đo bức xạ so với chỉ tiêu trong tiêu chuẩn được thực hiện như sau:
+ Các kết quả đo phải được so sánh với các giới hạn tương ứng để quyết định xem thiết bị có thỏa mãn các yêu cầu của tiêu chuẩn hay không;
+ Giá trị sai số của phép đo đối với mỗi tham số sẽ được đưa vào báo cáo đo kiểm.
PHỤ LỤC C
(Quy định)
TỔNG HỢP CÁC YÊU CẦU VÀ PHƯƠNG PHÁP ĐO KIỂM
C.1. Thiết bị điện thoại không dây có công suất máy phát nhỏ hơn 1W
Bảng 7. Tổng hợp các yêu cầu và phương pháp đo kiểm
TT
|
Tham số kỹ thuật
|
Chỉ tiêu kỹ thuật
|
Phương pháp đo kiểm
|
1
|
Tần số sóng mang máy phát
|
Tuân theo bảng 1
|
Mục 4.1.1
|
2
|
Loại phát xạ
|
F3E; G3E
|
|
3
|
Phân cách kênh tần số
|
10; 12,5; và 25 kHz
|
|
4
|
Công suất máy phát
|
< 1W
|
Mục 4.2.1
|
5
|
Dung sai công suất máy phát
|
±1,5 dB
|
Mục 4.2.1
|
6
|
Công suất phát xạ giả
|
Chế độ chờ: ≤ 2,0 nW
Chế độ hoạt động: ≤0,25W
|
Mục 4.6.1
|
7
|
Độ ổn định tần số sóng mang
|
±20 x 10-6
|
Mục 4.1.3
|
8
|
Độ di tần cực đại
|
Bảng 2
|
Mục 4.3.1
|
9
|
Dung sai tần số
|
Bảng 3
|
Mục 4.1.1
|
10
|
Độ nhạy cực đại máy thu
|
Bảng 5
|
Mục 4.4.1
|
11
|
Đặc tính biên độ của máy thu
|
≤ 3,0 dB
|
Mục 4.5
|
12
|
Chỉ tiêu giao tiếp với mạng điện thoại công cộng
|
TCN 68 – 188: 2000
|
TCN 68 – 188: 2000
|
C.2. Thiết bị điện thoại không dây có công suất máy phát từ 1W đến 25W
Bảng 8. Tổng hợp các yêu cầu và phương pháp đo kiểm
TT
|
Tham số kỹ thuật
|
Chỉ tiêu kỹ thuật
|
Phương pháp đo kiểm
|
1
|
Tần số sóng mang máy phát
|
Tuân theo bảng 1
|
Mục 4.1.2
|
2
|
Loại phát xạ
|
F3E; G3E
|
|
3
|
Phân cách kênh tần số
|
25 kHz
|
|
4
|
Công suất máy phát
|
1W ≤ P ≤ 25W
|
Mục 4.2.2
|
5
|
Dung sai công suất máy phát
|
Khối trung tâm: ±2,0 dB
Khối di động: ±3,0 dB
|
Mục 4.2.2
|
6
|
Công suất phát xạ giả
|
≤ 2,5
|
Mục 4.6.2
|
7
|
Độ ổn định tần số sóng mang
|
Từ ±5x10-6 đến ±10x10-6
|
Mục 4.1.3
|
8
|
Độ di tần cực đại
|
Bảng 2
|
Mục 4.3.2
|
9
|
Dung sai tần số
|
Bảng 6
|
Mục 4.1.2
|
10
|
Độ nhạy cực đại máy thu
|
≤ 6 tại SINAD 20 dB
|
Mục 4.4.1
|
11
|
Đặc tính biên độ của máy thu
|
≤ 3,0 dB
|
Mục 4.5
|
12
|
Chỉ tiêu giao tiếp với mạng điện thoại công cộng và máy điện thoại tự động
|
TCN 68 – 188: 2000
|
TCN 68 – 188: 2000
|
TÀI LIỆU THAM KHẢO
[1] ITU-R Rep. 1025-1: “Technical and Operational Characteristics of Cordless Telephone and Cordless Telephones”
[2] ITU-R Rec. SM.329-7 (March 1999): “Spurious emission”
[3] ITU-R M.478-5 (10/1995): “Technical characteristics of equipment and principles governing the allocation of frequency channel, between 25 and 3000 MHz for the FM land mobile services”
[4] ITU-R Rec. SM.1045-1 (10/1997): Frequency tolerance of transmitter
[5] ETS 300 086 (January 1991): “Radio Equipment and System Land Mobile Service Technical characteristics and test conditions for radio equipment with an internal or external RF connector intended primarily for analog speech”
[6] ITU-R Rec. M.1033-1: “Technical and Operational Characteristic of Cordless Telephone and Cordless Telecommunication Systems”.
[7] ETR 027 (September 1991): “Radio Equipment and Systems; Methods of Measurement for Radio Equipment”
[8] ETS 300 390 (February 1996): “Technical characteristics and test conditions for Radio equipment intended for the transmission of speech and using integral antenna”.
CONTENTS
Foreword
1. Scope
2. Definitions and Abbreviations
2.1. Definitions
2.2. Abbreviations
3. Technical requirements
3.1. General
3.2. Technical requirements for equipments having transmitter power of less than 1 W (applied for integral antenna equipment)
3.3. Technical requirements for equipments having transmitter power of 1W up to 25W
4. Methods of measurement
4.1. Transmitter carrier
4.2. Transmitter carrier power
4.3. Maximum frequency deviation
4.4. Maximum receiver sensitivity
4.5. Amplitude characteristic for analogue speech
4.6. Spurious emission
Annex A (Normative): Normal test conditions
Annex B (Normative): Absolute measurement uncertainties and measurement result processing
Annex C (Normative): Measurement requirements and method Generalization
References
FOREWORD
The technical standard TCN 68 - 143: 2003 "Cordless Telephone Equipment (Extensible Subscriber Categories) -Technical Requirements" is based on amending and supplementing the technical standard TCN 68-143: 2000, TCN 68-143: 1995 in accordance with updated recommendations of the International Telecommunication Union (ITU) and European Telecommunication Standardization Institute (ETSI).
The technical standard TCN 68 - 143: 2003 is edited by Research Institute of Posts and Telecommunications (RIPT) at proposal of the Department of Science & Technology and adopted by the Decision No 195/2003/QD-BBCVT of the Minister of Posts and Telematics dated 29/12/2003.
The technical standard TCN 68 - 143: 2003 is issued in a bilingual document (Vietnamese version and English version). In cases of interpretation disputes, Vietnamese version is applied.
DEPARTMENT OF SCIENCE & TECHNOLOGY
TCN 68 - 143: 2003
CORDLESS TELEPHONE EQUIPMENT (EXTENSIBLE SUBSCRIBER CATEGORIES) - TECHNICAL REQUIREMENTS
(Issued together with Decision No 195/2003/QD-BBCVT of December 29, 2003 of the Minister of Posts and Telematics)
1. Scope
This technical standard specifies the technical requirement for cordless telephone equipments - Radio Extensible Subscriber Categories having the transmitter power of up to 25 W, used in the national telecommunication network intended for the transmission of analogue speech signal and connected to the public-switched telephone network through the 2-wire interface.
This technical standard is used as a basis for type approval of equipment mentioned above.
Notes:
- This standard shall not he applied to wireless telephone systems used for analogue or digital mobile communication which have radio control channel from central station (such as CT1, CT2, DECT, WLL, systems...).
- The compliant certification of this standard shall not replace transmitter usage and radio frequency license.
2. Definitions and Abbreviations
2.1. Definitions
2.1.1. Cordless Telephone
Telephone terminal equipment connected to the public switched telephone network through the 2-wire analogue interface. This equipment consists of two separate units, which are connected to each other through radio interface:
+ Base Unit: equipment intended for use in a fixed location and connected to the public switched telephone network (PSTN) through the telephone line; fitted with either an 50 antenna socket or an integral antenna.
+ Mobile Unit: mobile equipment fitted with either an integral antenna when used with a desktop station or an antenna socket, for use with external antenna when fixed in transportable stations. This unit has the same subscriber number as the base unit and can communicate with the base unit.
Figure 1 illustrates the operation configuration of the equipment.
Figure 1: Operation configuration of cordless telephone, extensible subscriber categories
2.1.2. Integral Antenna
An antenna designed to be fixed and considered to be part of the equipment. An integral antenna may be fitted internally or externally to the equipment.
2.1.3 Artificial antenna
A 50 non-reactive, non-radiating antenna used to test transmitter.
2.1.4. Substitution antenna
Antenna used to replace equipment under test. It is connected to signal generator to measure spurious emission and effective radiated power; and connected to a measuring receiver or a spectrum analyzer to measure receiver sensitivity.
2.1.5. Test antenna
Antenna used for measurements of radiation from equipment under lest and substitution antenna or used as a transmitting antenna when the test site is used for the measurement of receiver characteristics.
2.1.6. Effective Radiated Power
The effective radiated power is defined as the maximum radiated power in the direction of maximum field strength in the absence of modulation and under specific conditions of measurement.
2.1.7. Frequency Deviation
The maximum difference between instantaneous frequency of modulated radio frequency signal and carrier frequency in the absence of modulation.
2.1.8. Maximum Permissible Frequency Deviation
The maximum permissible frequency deviation is the maximum value of frequency deviation, determined equivalent to 20% of corresponding channel separation.
2.1.9. Frequency Tolerance
The maximum difference between the central frequency of the occupied radiated frequency band and assigned frequency.
2.1.10. Frequency Stability
The ratio between the maximum frequency error and nominal transmitter frequency within a specified duration.
2.1.11. Maximum Sensitivity
The minimum level of signal or field strength at the input of receiver antenna at the nominal frequency of receiver and with the test modulation frequency of 1 kHz and the deviation of 60% of the maximum frequency deviation with which the following conditions have still met:
+ The minimum audio frequency output power is 50% of the nominal output power of the receiver.
+ The SINAD ratio at the receiver output is 20 dB.
2.1.12. Emission Class
Radiation characteristics such as carrier modulation type, modulating signal and the format of transmit signal in form of standard characters (such as F3E; G3E...).
2.1.13. Spurious Emissions
Spurious emissions are emission on a frequency or frequencies which are outside the necessary bandwidth and the level of which may be reduced without affecting the corresponding transmission of information. Spurious emissions include harmonic emissions, parasitic emissions, intermodulation products and frequency conversion products, but exclude out-of-band emissions.
2.1.14. Test Fixture
The test fixture is a radio frequency coupling device associated with an integral antenna equipment used for conducted measurements at different carrier frequencies. The test fixture provides a connection to an external power supply, an audio input and a 50 RF output. The test fixture shall conform to the following basic parameters:
+ The coupling loss shall not be greater than 30 dB;
+ The VSWR of RF coupling circuits having 50 impedance shall not be greater than 1.5 over the frequency range of the measurements
2.2. Abbreviations
AC
|
Alternate Current
|
BU
|
Base Unit
|
CT
|
Cordless Telephone
|
CH
|
Channel
|
dBc
|
dB relative to the carrier power
|
DC
|
Direct Current
|
FM
|
Frequency Modulation
|
INTERCOM
|
Interoffice Communication
|
LED
|
Light Emission Diode
|
MU
|
Mobile Unit
|
PM
|
Phase Modulation
|
PSTN
|
Public Switched Telephone Network
|
rms
|
Root-mean-square
|
Rx
|
Receiver
|
RF
|
Radio Frequency
|
SINAD
|
Signal + Noise + Distortion/Noise + Distortion
|
Tx
|
Transmitter
|
STANDBY
|
Standby mode
|
VSWR
|
Voltage Standing Wave Ratio
|
3. Technical requirements
3.1. General
3.1.1. Transceiver frequencies of equipment shall conform to frequency hand ranges as given in Table 1.
Table 1: Frequency bands intended for cordless telephone
Frequency band (MHz)
|
43 ÷ 44
|
46 ÷ 73,5
|
261.5 ÷ 262.5
|
263.5 ÷ 264.5
|
387.5 ÷ 388.5
|
389.5 ÷ 390.5
|
3.1.2. Channel Separation:
+ For equipments having transmitter power of less than 1 W, the channel separation shall be 10 kHz; 12.5 kHz; 20 kHz and 25 kHz.
+ For equipments having transmitter power in the range of 1 W up to 25 W, the channel separation shall be 25 kHz.
3.1.3. Emission Class
Cordless Telephone equipments shall conform to the following-emission classes:
+ F3E: Direct frequency modulation, used for analogue transmission of voice
+ G3E: Indirect frequency or phase modulation, used for analogue transmission of voice.
3.1.4. Nominal transmit power: Shall not exceed 25 W
3.1.5. Maximum Frequency Deviation
The maximum frequency deviation of transmitter shall not exceed the values shown in table 2.
Table 2: Maximum Frequency Deviation for different channel separations
Channel separation (kHz)
|
Maximum frequency deviation (kHz)
|
Required bandwidth (kHz)
|
10
|
±2.0
|
6.0
|
12.5
|
±2.50
|
8.5
|
20
|
±4.0/±5.0
|
14/16
|
25
|
±5.0
|
16
|
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