SJ 20657-1998 General Specification for Special Police Communication System
Some standard content:
Military standard for electronic industry of the People's Republic of China FL5820
SJ 20657 1998
General specification for
special police communication systems Issued on 1998-03-11
Implementation on 1998-05-01
Approved by the Ministry of Electronics Industry of the People's Republic of China Scope
2 Referenced documents
3 Requirements
4 Quality assurance regulations
5 Delivery preparation
6 Notes...bzxZ.net
Appendix A Defect classification (supplement)
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1 Scope
1.1 Subject content Military standard for electronic industry of the People's Republic of China General specification for
special police communication systems systensSJ20657-1998
This specification specifies the requirements, quality assurance regulations, delivery preparation and instructions for the special police communication system. 1.2 Scope of application
This specification applies to all types of equipment in the special police communication system. The requirements of this specification should be followed when writing product specifications. 2 References
GB191-90 Packaging, storage and transportation pictorial symbols
GB3380-82 Ringing current and signal tone of telephone automatic switching network GB6282-86 Interface parameters for 25~1000MHz land mobile communication network to access the public communication network through the user line CB9410-88 General technical specifications for mobile communication antennas GB12192-90 Measurement methods for mobile communication FM radio telephone transmitters GB12193-90 Measurement methods for mobile communication FM radio telephone receivers GB/T1549!-1995 Electrical performance requirements and measurement methods for mobile communication duplexers GB/T15844.1-1995 General technical conditions for mobile communication FM radio telephones GB/T15844.5-1995 Quality assessment rules for mobile communication FM radio telephones Technical requirements for the interface of dedicated mobile communication systems to the public telephone automatic switching network CB
GB/T15874-1995 General specification for trunking mobile communication system equipment GJB15!-86 Requirements for electromagnetic emission and sensitivity of military equipment and subsystems GJB152-86 Measurement of electromagnetic emission and sensitivity of military equipment and subsystems GB179-86 Procedures and tables for counting sampling inspection GB230-87 Interface of military tropospheric scatter communication system GJB367.1-87 General technical conditions for military communication equipment Design and manufacturing requirements CJB367.2-87 General technical conditions for military communication equipment Environmental test methods GJB367.3-87 General technical conditions for military communication equipment Reliability identification test and acceptance test methods GJB367.5-87 General technical conditions for military communication equipment Packaging, transportation and storage requirements Ministry of Electronics Industry of the People's Republic of China 1998-03-11 Issued 1998-05-01 Implementation
SJ 20657--1998
GJB368.2-87 General specification for equipment maintainability Basic requirements for maintainability GJB368.5-87 General specification for equipment maintainability Test and evaluation of maintainability GJB450-88 Reliability standard for equipment development and production GJB663-89 Safety requirements for military communication equipment and systems SJ/T10413-93 General specification for small and medium capacity multi-channel mobile communication systems SJ20044-92 Safety requirements for short-wave single-sideband communication equipment 3 Requirements
3.1 Qualification appraisal
Products submitted in accordance with this specification should be products that have been qualified or approved for finalization. 3.2 Design
3.2.1 System composition
The system is mainly composed of base station equipment (control terminal, base station, combiner, splitter, antenna and feeder, uninterruptible power supply, dispatch telephone, etc.), fixed radio, vehicle-mounted radio and handheld radio. 3.2.2 The design and manufacture of system equipment shall meet the relevant requirements of GJB367.1. The system signaling adopts analog or digital format. The overall design plan must be strictly and scientifically demonstrated, and the best plan must be selected to maximize the communication capability of the system.
3.3 Structure
The structure of the system equipment shall meet the requirements of Article 1.5 of GJB367.1, and shall have good processability and inheritance, and be able to adapt to the requirements of various specified environments. The structure must also be firm, reliable, safe, and easy to install, maintain and transport. 3.4 Dimensions
The dimensions of various types of system equipment are specified by the product specifications. 3.5 Weight
The weight of various types of system equipment is specified by the product specifications. 3.6 Color
The color of each type of equipment in the system shall be specified by the product specifications: 3.7 Surface condition
The surface condition of each type of equipment in the system shall comply with the relevant provisions of Article 12.6 of GJB367.1 3.8 Product logo and code
3.8.1 Nameplate
All products shall have permanent nameplates, which shall indicate the product name (or code), factory name, ex-factory date, and serial number 3.8.2 Marking
The knobs, connectors, etc. on the front and rear panels of various types of equipment shall have obvious operation signs. 3.9 Appearance quality
The outer coating of various types of equipment shall be free of blistering, accumulation, cracking, obvious scratches, and the metal parts shall be in good condition without rust or shedding.
3.10 Safety
The human-machine safety requirements of the system equipment shall comply with the relevant regulations of CJB663 and GJ3367.1.2
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3.11 Maintainability
SJ 206571998
The maintainability design of the system equipment shall comply with Article 1.6 of GIB 367.1 and CIB 368.2. The mean time to repair (MTTB) of equipment failures should not exceed 0.5h. 3.12 System performance characteristics
3.12.1 General system characteristics (see 4.8.4) 3.12.1.1 Working frequency band
The working frequency band is 350~1000MHz. The specific frequency band is in accordance with the provisions of the National Standards Committee. 3.12.1.2 Channel spacing
The channel spacing is 25kHz.
3.12.1.3 System working mode
The system working mode can be single-zone or multi-zone. The mobile station generally works in heterodyne simplex or duplex mode. 3.12.1.4 System working Channel selection mode The channel selection mode can be cyclic positioning, cyclic non-positioning, cyclic distributed positioning or other improved types. 3.12.1.5 System signaling
System signaling can use analog signaling or digital signaling. 3.12.1.5.1 Analog signaling
a. Analog signaling can use DTMF code or single tone specified by CCIR; b. The analog signaling encoding format is specified by the product specification. 3.12.1.5.2 Digital signaling
a. Transmission rate; 300bit/s or 1200bit/sb. Baseband signal code type: Manchester code: c. Encoding format
Bit-same Step code
Word synchronization code
Information code
Error correction code
Among them: the bit step code is 1010101010101010, the code length is 16bit; the word synchronization code is Barker code, length n=bit:
Error correction code is BCH, Hagelharger code. d. Error control mode: forward error correction mode (FEC); e. Modulation mode: FSK or MSK subcarrier is modulated. 3.12.1.6 Number of wireless channels in the system
The number of wireless channels is not more than 8.
3.12.1.7 System access to wired network mode
3. 12.1.7.1 The system control terminal is connected to the public telecommunication network terminal, and the network access method should comply with the relevant provisions of GB.
3.12.1.7.2 The system control terminal is connected to the user exchange in a relay manner, that is, the outgoing relay line of the control terminal is connected to the user level of the user exchange, and the outgoing relay line of the user exchange is connected to the user level of the control terminal. 3.12.1.7.3 The system control terminal is connected to the monthly level of the user exchange by the user line. 3.12.1.8 System communication distance
The system communication distance (plain area) is generally calculated based on the base station as the center: a. Mobile vehicle-mounted station can reach 40km;
b. Mobile handheld station can reach 15km.
3.12.1.9 Interface parameters
3,12.1.9.1 System and telecommunication network interface
SJ 20657—1998
. The system is connected to the telecommunication network terminal according to 3.12.1.7.1, and the interface parameters should comply with the relevant provisions of the GB dedicated mobile communication system access to the public telephone automatic switching network interface technical requirements. The system is connected to the user exchange according to 3.12.1.7.2 and 3.12.1.7.3, and the interface parameters should comply with the regulations in GB6282.
3.12.1.9.2 The control terminal and the base station interface are connected by various transmission lines to transmit signaling and voice. Interface requirements:
a. Audio signal bandwidth: 300~3000Hz
h. Interface impedance: 6002;
c. Use 4-wire balanced mode or single-ended common ground mode. 3.12.1.9.3 Transmission performance indicators
The transmission performance shall comply with the relevant provisions of the technical requirements for the interface of the GB dedicated mobile communication system to the public telephone automatic switching network.
3.12.1.10 System full-channel voice quality
a. The signal-to-noise ratio in the audio passband shall not be less than 12dB; b. Audio response: In the range of 300 to 3000Hz, the amplitude variation range relative to 1020Hz shall not be worse than -2.2dB6.5dB;
c. System communication probability: The specified system full-channel voice quality shall be achieved in 90% of the areas and 90% of the time in the coverage area; the communication probability in the marginal area is 70%.
3.12.2 Basic functions of the system (see 4.8.5) 3.12.2.1 Essential functions
a. Wireless users in the system can automatically call wired users; b. Wireless users in the system can automatically select or group call wireless users in the system; c. PABX wired users can manually transfer or dial to wireless users; d. PSTN wired users can manually transfer or dial to wireless users; . There should be a prompt tone when the mobile unit's main call dialing button is pressed or the called party is successfully decoded: f. There are plain language and password calls between users in the system, The wireless user sends a signal to request the plain/secret language conversion, which is randomly assigned by the control terminal. The two parties of the call automatically lock the call under the same key number. The system key is 32g. The control terminal can remotely kill the wireless user, and the full-time personnel must fix the dead system to restore normal operation; h. The control terminal should have fault detection and alarm functions: i. The control terminal should have a self-test program and a test interface to detect the sending and receiving of borrowed commands and the quality of the voice channel of each channel; i. It should have a good Chinese human-computer dialogue interface, which can edit, modify or delete system parameters, equipment files and user parameters.
3.12.2.2 Selection function
a. Single dialing, store dialing, position dialing, off-hook dialing and repeat dialing of the mobile unit are in accordance with product specifications;
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SI20657--1998
b. The control terminal can remotely change the wireless user number. Set multiple priority levels for wireless users in the system. The authorized user has the function of forced insertion. When interrupting, the third-party voice channel must be cut off. There must be a prompt tone before and after the interruption; d. The call time limit can be set by programming, and there must be a prompt tone 30s before the time is up; e. Set an open channel. The open channel wireless signaling is DTMF code. The control terminal software must support different communication systems to dial each other and connect the voice channel under the same DTMF signaling; f. The system allows wireless users to go offline and return to the network; it should be able to view the current record of system operation, select the operation record within a certain period of time and print the operation record. 3.12.3 System control terminal electrical performance
3.12.3.1 Interface parameters (see 4.8.6.1) a. The analog signaling control terminal outputs DTMF signals or CCIB tone signals, and its tone frequency accuracy is better than 8x10-3. The encoding rules are specified by the product specifications; b. The tone level difference of each character of the DTMF signal is not greater than 2dB; c. The digital signaling clock accuracy should be better than 1×10-4; d. The frequency accuracy and encoding rules of the digital signaling subcarrier are specified by the product specifications; e. Forwarding to the wired telephone network The dial pulse signal or DTMF signal shall comply with the relevant provisions of GB6282; f. The audio signal level sent to the wired telephone network: 4.5±2dBm/600Q; . The audio signal level output from the wired telephone network: 0±2d3m/6000h. The audio signal level at the base station interface is specified by the product specification 3.12.3.2 System management tone (see 4.8.6.2) 8. The dial tone, ring tone, ringback tone, and busy tone shall comply with the relevant provisions of Table 1 in Article 2 of CB3380; b. Various prompt tones are specified by the product specification. 3.12.3.3 Audio response (see 4.8.6.3) The amplitude of the receiving and sending channels of the voice channel changes from -1.5 to 0.8dB in the range of 300 to 3000Hz relative to 1020Hz.
3.12.3.4 Audio distortion (see 4.8.6.4) The audio distortion of the receiving and sending channels of the voice channel should be less than 3%: 3.12.3.5 Decoding level (see 4.8.6.5) The decoding level of the single-tone decoder or D1MF decoder in the analog signaling control terminal is specified by the product specification. 3.12.3.6 Single-tone decoding bandwidth (see 4.8.6.6) The decoding bandwidth of the analog signaling single-tone decoder is specified by the product specification. 3.12.3.7 Correct decoding rate (now 4.8.6.7) The correct decoding rate of the analog signaling and digital signaling decoders should reach more than 90% (when the 12B signal-to-noise ratio is guaranteed). 3.12.4 Electrical performance requirements for other system equipment (see 4.8.7.1, 4.8.7.2) 3.12.4.1 The electrical performance indicators of base stations, vehicle-mounted stations, handheld stations, etc. shall comply with the requirements of Article 5.2 of GB/115844.1 3.12.4.2 Electrical performance of control units such as vehicle-mounted stations, handheld stations, fixed stations, etc. a. Analog I number (IY[MF or CCIB single tone), the single tone frequency accuracy is excellent -F-&×1)-, the coding rules are specified by the product specifications: || tt||b. The digital signal clock accuracy should be better than 1×10~: SJ206571998
C. The frequency accuracy and coding rules of the digital signaling subcarrier are specified by the product specifications: d. The analog signal level sent to the transmitter is specified by the product specifications, but must be continuously adjustable: e. The waveform distortion of the single-tone signal of the code tone should be less than 5%; f. The decoding level of the analog or digital signal decoder is specified by the product specifications; g. The decoding bandwidth of the analog or digital signal decoder is specified by the product specifications. 3.12.5 Base station antenna feed equipment
3.12.5.1 Antenna electrical performance (see 4.8.7.3.1) The main electrical performance indicators of the antenna refer to the relevant provisions in GB9410. 3.12.5.2 Duplexer electrical performance (see 4.8.7.3.2) The electrical performance indicators of the duplexer shall comply with the relevant provisions in GB/F 1549I. 3.12.5.3 Electrical performance of transmitter combiner (see 4.8.7.3.3) a. Insertion loss: specified by product specifications; b. Isolation between transmitter branches: greater than or equal to 55dB; c. Withstand power: greater than or equal to 80W;
d. Reverse transmission loss: greater than or equal to 50dB (using 3dB coupler); e. Voltage standing wave ratio: less than or equal to 1.5; f. Port impedance: 502.
3.12.5.4 Electrical performance of receiver splitter (see 4.8.7.3.4) a. Isolation between receiver branches: greater than 20dB; b. Gain: specified by product specifications;
c. Noise figure: less than 6.5dB;
d. Voltage standing wave ratio: less than or equal to 1.5; e. Port impedance: 500.
3.12.5.5 Feeder
The loss between the antenna and the antenna feeder equipment should not exceed 3dB. 3.13 Environmental requirements
3.13.1 Temperature
8. Operating temperature: -25~55℃ (outdoor); -10~50℃ (indoor). b. Storage temperature: -40~60℃.
c. During the high and low temperature test, the items and requirements for the initial measurement, intermediate measurement and final measurement of the control terminal shall be as specified in Table 1. Other equipment shall be as specified in Article 5.5.2 of CB/T15844.1! Table!
Interface parameters
Decoding level
Correct decoding rate
Requirement chapter, article number
3.12,3. 1a
3.12.3.1f
Test method
Chapter, article number
Specified value
Equal to or less than 10% of the value measured at normal temperature
Equal to or less than 2dB of the value measured at normal temperature
10% of the value measured at normal temperature
10% lower than the value measured at normal temperature
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3.13.2 Wet Heat
SJ 20657-1998
After the equipment is tested according to the provisions of Chapter 3 of "411 Wet Heat Test" in CJB367.2, the metal parts shall be free of corrosion, and the coating shall be free of loosening and blistering. The initial measurement and final measurement of the control terminal shall comply with the requirements of this specification. The intermediate measurement items and requirements shall be in accordance with Table 1. Other equipment shall comply with the provisions of Article 5.5.2 of GB/T15844.1. 3.13.3 Vibration
After the equipment is subjected to the vibration test specified in Table 409-1 of "409 Vibration Test" in GB367.2, the fixed parts shall not be loose or displaced, and the moving parts shall not be stuck or bitten. The initial measurement and final measurement items are specified by the product specification. 3.13.4 Shock
The equipment shall be able to withstand the shock specified in the basic design test specified in Table 408-1 of "408 Shock Test" in GB367.2. The initial and final measurement items are specified by the product specification. 3.13.5 Rain
After the outdoor equipment is tested according to Article 4.1 of "410 Rain Test" in GJB367.2, there should be no water accumulation and water droplets inside the machine: the initial and final measurement items are specified by the product specification. 3.13.6 Mold
After the equipment is subjected to the "412 Mold Test" in GJB367.2, there should be no obvious mold growth and corrosion. The initial and final measurement items are specified by the product specification. 3.13.7 Salt Spray
After the equipment is subjected to the test specified in Chapter 3 of "413 Salt Spray Test" in GJB367.2, there should be no obvious blistering, pitting or visible damage caused by loosening of metal surface coating, and no degradation and corrosion on the surface. The initial and final measurement items are specified by the product specification.
3.13.8 Low pressure
After the equipment has been subjected to the 57kPa low pressure test specified in Chapter 3 of "403 Low Pressure Test" in GJB367.2, it should be able to operate normally. Its initial and final measurement items are specified by the product specification. 3.14 Reliability
3.14.1 The preparation of the reliability outline of the special police communication system shall comply with the relevant provisions of CJB450. 3.14.2 The mean time between failures MTBF (81) of the special police communication system shall not be specified in the product specification. 3.15 Electromagnetic compatibility
The electromagnetic compatibility of all types of equipment in the system shall comply with the relevant requirements of (JB151: 4 Quality Assurance Provisions
4.1 Inspection Responsibility
Unless otherwise specified in the contract or order, the contractor shall be responsible for completing all inspection items specified in this specification. If necessary, the ordering party or the superior appraisal agency has the right to inspect any inspection item in the specification: 4.1.1 Qualification Responsibility
All products must comply with all requirements of Chapter 3 and Chapter 5 of the specification: The inspection items specified in this specification It should be an integral part of the contractor's entire inspection system and quality program. If the inspection requirements are not specified in this specification, the contractor shall also ensure that the products submitted for acceptance meet the contract requirements. Quality consistency inspection is not allowed to submit products that are known to be defective, nor is it allowed to require the ordering party to accept defective products. 4.2 Inspection classification
The inspection categories specified in this specification are:
. Identification inspection;
b. Quality consistency inspection.
4.3 Inspection conditions
SJ 20657-1998
Unless otherwise specified, the inspection conditions of various equipment in the system shall be tested in accordance with the provisions of Article 2.1.1 of GJB367.2.
4.4 Appraisal and Inspection
Appraisal and inspection are generally carried out when the equipment is designed and produced. However, when there are major changes in the main design, process, components and materials of the equipment, which affect the importance of the equipment and make the original appraisal conclusion no longer valid, appraisal and inspection shall also be carried out.
Appraisal and Inspection The test shall be conducted in a laboratory approved by the ordering party or the superior appraisal organization. 4.4.1 Inspection Items
The appraisal inspection items shall be conducted in accordance with the provisions of Table 2. 4.4.2 Sampling Plan
The samples for the appraisal inspection shall be randomly selected by the quality inspection department from at least 34 products submitted for the appraisal inspection for normal temperature inspection; after passing the inspection, 2 to 3 of them shall be selected for environmental testing. 4.4.3 Qualification Criteria
When all the inspection items meet the requirements of Chapter 3 and Chapter 5, the appraisal inspection is judged to be qualified. If any of the inspection items does not meet the specified requirements, the inspection shall be suspended, and the contractor shall analyze the unqualified items, find out the reasons for the defects, and continue the inspection from the item or related items after taking corrective measures. If all the inspection items meet the specified requirements, the appraisal inspection is still judged to be qualified; if there is still an item that does not meet the specified requirements after continued inspection, the appraisal inspection is judged to be unqualified.
4.4.4 Maintenance of Appraisal Qualification
The contractor shall specify in the product specification the items to be maintained for the purpose of guaranteeing the qualification. Measures taken to maintain product qualification, and submit test data regularly (including submission frequency)
4.5 Quality-Conformity Inspection
Quality-Conformity Inspection is divided into A, B, C and D group inspections: 4.5.1 Group A Inspection
4.5.1.1 Inspection Items
Group A inspection items are carried out in accordance with Table 2
4.5.1.2 Sampling Plan
Group A inspection can be carried out by full inspection or sampling inspection, but isolated batches should be inspected in full. a. Full inspection: The quality inspection department inspects each product of the submitted batch. The quality of the inspection batch is expressed by the rate of defective products. The boundaries between product acceptance and rejection are: serious non-conforming product rate 4%; minor non-conforming product rate 10%. h. Sampling inspection: The quality inspection department randomly selects samples from the products submitted for inspection. The sampling plan adopts the sub-standard belt inspection and sampling plan in B179-general inspection set water half II, and the acceptance quality level A is stipulated as: 8--serious non-conforming products are: 2.5, 4.0; minor non-conforming products are: 6.5, 10.0. SJ 206571998 The specific regulations are stipulated by the product specifications. Defect classification see Appendix A (Supplement) Table 2
Controlled crack electrical properties
Inspection items
Dimensions
Surface condition
Product logo
Appearance quality
Safety
Maintenance
General system characteristics
Basic system functions
Interface parameters
System management single tone
Audio response
Audio distortion
Decoding level
Single tone decoding bandwidth
Correct decoding Rate
Electrical performance of base station, vehicle-mounted station, handheld stationVehicle-mounted station, handheld station, fixed station
Electrical performance of control unit
Electrical performance of base station antenna
Electrical performance of base station duplexer
Electrical performance of transmitter combiner
Insertion loss
Isolation between transmitter branches
Withstand power
Reverse transmission loss
Voltage standing wave ratio
Terminal impedance
Energy inspection
Quality consistency inspection
Chapter number
3. 12.3.7
3.12.41.1
Test method
Regulation number
4.8.7.3.1
4.8.7.3.2||tt| |4.8.7.3.3
4.8.7.3.3
4.8.7.3.3
4.8.7.3.3
4.8.7.3.3||tt| |4.4.7.3.3
Electrical performance of receiver splitter
Test items
Isolation between receiver branches
Dryness coefficient
Voltage standing wave ratio
Port limiting impedance
Low voltage
Reliability
Electromagnetic compatibility
Note: ①“” is a mandatory inspection item:
\_” is an uninspected item;
SJ 20657--1998
Fixed inspection
③“Public” indicates items to be inspected as required; ①“,” indicates in accordance with GB/T15844.1.
4.5.1.3 Qualification criteria
Quality and conformity inspection
Chapter number
3. 12.5.4
Test method
Chapter number
4.8.7.3.4
4.8.7.3.4
4.8.7.3.4
4.8.7.3.4
4.8.7.3.4
4.7、4.8.11
a.Full inspection: For full inspection, when one of the following situations is found, the batch of products shall be judged as unqualified. Serious unqualified product rate: greater than 4%;
Minor unqualified products: greater than 10%.
b. Sampling inspection: If the number of unqualified products found in the sample is less than or equal to the acceptance judgment number, the batch of products shall be accepted; if the number of unqualified products is equal to or greater than the rejection judgment number, the batch of products shall be rejected. If a fatal defect is found during the Group A inspection, the batch of products shall be rejected. 4.5.1.4 Re-inspection
For batches that fail the Group A inspection, the contractor shall analyze the batch of products, find out the cause of the defect and take corrective measures. The batch may be resubmitted for inspection: The resubmitted batch shall be separated from the new batch and marked with the "resubmitted batch" mark, and shall be strictly inspected.
If the re-inspection is qualified, the batch of Group A is still judged to be qualified; if the re-inspection is still unqualified, the batch of Group A is judged to be 10
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