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GY/T 195-2003 English PDF

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GY/T 195-2003: Specifications and methods of measurement on two-way subscriber port used in CATV systems
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GY/T 195-2003English179 Add to Cart 2 days [Need to translate] Specifications and methods of measurement on two-way subscriber port used in CATV systems Valid GY/T 195-2003

PDF similar to GY/T 195-2003


Standard similar to GY/T 195-2003

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Basic data

Standard ID GY/T 195-2003 (GY/T195-2003)
Description (Translated English) Specifications and methods of measurement on two-way subscriber port used in CATV systems
Sector / Industry Radio, Film & TV Industry Standard (Recommended)
Classification of Chinese Standard M61
Classification of International Standard 33.160
Word Count Estimation 5,584
Date of Issue 2003-10-13
Date of Implementation 2003-12-01
Summary This standard specifies the user port bidirectional cable system technical requirements and methods of measurement. For the same measurement uncertainty can ensure that any equivalent measurement methods may also be used. Dispute should be based on this standard shall prevail. This standard applies to two-way cable system user interface development, production, application and operation and maintenance.

GY/T 195-2003: Specifications and methods of measurement on two-way subscriber port used in CATV systems


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Specifications and methods of measurement on two-way subscriber port used in CATV systems GY Central Republic Radio, Film and Television Cable TV system two-way user port Technical requirements and measurement methods Specifications and methods of measurement on two-way subscriber port used in CATV systems Shi 2.2003-12-01 Real 003-10-13 China National Radio, Film and Television Administration issued standard cloth

Foreword

This standard refers to GY/T 140-1999 "Technical Conditions and Measurement Methods for Cable TV System Output Ports (5 ～ 1000MHz)", GY/T 180-2001 "Technical Specifications for Physical Transmission Channels of HFC Networks Uplink", GY/T 106-1999 "Technical Specifications for Cable Television Broadcasting Systems", IEC 60728-4 "Cable distribution system equipment and components for television and sound signals-Part 4. Upstream broadband coaxial distribution equipment", IEC 60728-3 "Cable distribution system equipment and components for television and sound signals-Part 3. Downstream broadband coaxial distribution equipment" Fixed. Part of the technical requirements and measurement methods of this standard refer to GB/T 11318.1-1996 "Cable distribution system for television and sound signals Equipment and components-Part 1. General specifications and GB/T 11318.12-1996 "Equipment and components for cable and distribution systems for television and sound signals Part 12. General Specifications for System Outputs. During the development of this standard, a large number of test data and cable television systems should be comprehensively analyzed. The specific requirements of the application, while taking into account the advanced nature of the technical requirements, while taking into account the needs of production costs and use. This standard is under the jurisdiction of the National Radio and Television Standardization Technical Committee. This standard was drafted. State Administration of Radio, Film and Television Radio and Television Measurement and Testing Center, Zhongshan Jiehexing Electronics Co., Ltd. The main drafters of this standard. Yao Ruihong, Cui Yan, Qin Yilong, Nie Mingjie, Zou Xuanping, and Wang Hongqing. Cable TV system two-way user port Technical requirements and measurement methods

1 Scope

This standard specifies the technical requirements and measurement methods of two-way user ports for cable television systems. For ensuring the same measurement uncertainty Any equivalent method can also be used. In case of dispute, this standard shall prevail. This standard applies to the development, production, use, operation and maintenance of two-way user ports in cable television systems.

2 Normative references

The clauses in the following documents have become the clauses of this standard after being referenced. For dated references, all subsequent Neither amendments (excluding errata) or revised versions are applicable to this standard, however, parties who have reached an agreement under this standard are encouraged to study Is the latest version of these files available? For undated references, the latest version applies to this standard. GB 5465.2-1985 Graphical symbols for electrical equipment GB/T 11318.1-1996 Cable and distribution system equipment and components for television and sound signals-Part 1. General specifications GY/T 106-1999 Cable TV system technical specifications GY/T 140-1999 Cable TV system output (5 ～ 1000MHz) technical conditions and measurement methods GY/T 180-2001 Technical Specifications of Physical Transmission Channels for HFC Networks

3 terms and definitions

The following terms and definitions apply to this standard. Two-way subscriber port Duplex access port in the user room that can transmit signals downwards and upwards.

4 Product Categories

According to the number of user ports and corresponding purposes, it is divided into two-hole user ports. TV port (TV port) and data port (DP port); three-hole user port. TV port (TV port), FM port (FM port) and data port (DP port).

5 Technical requirements

5.1 General requirements The appearance should be neat, and the surface should be free of obvious dents, scratches, cracks, burrs and deformation; the plating coating should not be blistering, cracking and peeling; gold The attachments shall be free from rust and mechanical damage; the pouring material shall not overflow. Structures and components should be fastened and not loose; the text and graphic symbols describing functions should be complete, correct, clear and firm; The shape symbol shall comply with the relevant provisions of GB 5465.2-1985. The input port and user port connectors should be metric F headers. 5.2 Technical requirements The technical requirements of the two-way user port of the cable television system are shown in Table 1. Table 1 Technical requirements for two-way user ports in cable television systems Technical index dB serial number items Frequency Range MHz two-hole three-hole 5 ～ 65 ≥45.0 ≥45.0 Input port-TV port 87 ～ 1000 ≤5.0 ≤6.0 Input port-DP port 5 ～ 1000 ≤5.0 ≤6.0 5 ～ 65 ≥30.0 insert loss Input port-FM port 87 ～ 108 ≤14.0 5 ～ 108 ≥30.0 TV port-FM port 108 ～ 1000 ≥28.0 5 ～ 65 ≥60.0 ≥60.0 TV port-DP port 87 ～ 1000 ≥26.0 ≥22.0 5 ～ 65 ≥60.0 mutual isolation FM-DP 87 ～ 1000 ≥35.0 5 ～ 65 ≥16 ≥16 87 ～ 550 ≥16 ≥16 input port 550 ～ 1000 ≥14 ≥14 108 ～ 550 ≥16 ≥16 TV port 550 ～ 1000 ≥14 ≥14 FM port 87 ～ 108-≥16 5 ～ 65 ≥16 ≥16 87 ～ 550 ≥16 ≥16 reflection loss DP port 550 ～ 1000 ≥14 ≥14 shield attenuation -5 ～ 1000 ≥90 ≥90 5 Withstand voltage input-2kV AC voltage, no breakdown for 1min

6 Measurement method

6.1 Measurement of insertion loss and isolation 6.1.1 Measurement block diagram see picture 1. input Output Input and output Measured in both directions User port The internet Analyzer Figure 1 Block diagram of insertion loss and mutual isolation measurement 6.1.2 Measurement procedure a) Set the working frequency range of the network analyzer to the working frequency range of the bidirectional user port under test; b) calibrate the network analyzer; c) Connect the bidirectional user port under test and the network analyzer according to Figure 1; d) read the maximum and minimum levels in the operating frequency range; e) Measure the insertion loss of input port to TV port, input port to DP port, and input port to FM port according to the frequency range requirements in Table 1. Consume f) Measure the isolation between TV port to FM port, TV port to DP port, and FM port to DP port according to the frequency range requirements in Table 1. If a frequency sweeper is used for measurement, it should meet the relevant regulations in GY/T 140-1999 and GB/T 11318.1-1996. A 75Ω termination load is applied to all unmeasured device ports. 6.2 Measurement of reflection loss 6.2.1 Measurement block diagram See Figure 2. Input and output The internet Analyzer Measured in both directions User port Figure 2 Block diagram of reflection loss measurement 6.2.2 Measurement procedure a) Set the working frequency range of the network analyzer to the working frequency range of the bidirectional user port under test; b) Perform “open”, “short”, and “match load” calibration on the network analyzer; c) Connect the bidirectional user port under test and the network analyzer according to Figure 2; d) According to the requirements of Table 1, directly read out the minimum value of the reflection loss in different frequency bands of the input port, TV port, FM port and DP port, which is the measurement. value. The input and output of the bidirectional user port under test shall be measured separately. If a frequency sweeper is used for measurement, it should meet the relevant regulations in GY/T 140-1999 and GB/T 11318.1-1996. A 75Ω termination load is applied to all unmeasured device ports. 6.3 Measurement of shielding attenuation Should comply with the relevant provisions of 5.4 of GY/T 140-1999.

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