GB 50198-1994 Civilian closed-circuit television system engineering technical specification
Some standard content:
Engineering Construction Standard Full Text Information System
National Standard of the People's Republic of China
GB50198-94
Civil Closed Circuit Monitoring Television System
Engineering Technical Specification
Technical code for regunation of civil closedcircuitmonitoringTVsystem
1994-03-11 Issued
State Bureau of Technical Supervision
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full Text Information System
1994-11-01
Jointly Issued
Engineering Construction Standard Full Text Information System
National Standard of the People's Republic of China
Civil Closed Circuit Monitoring Television System
Engineering Technical Specification
Technical code for regunation of civil closedcircuitmonitoringTVsystem
GB50198—94
Editing department: Ministry of Radio, Film and Television of the People's Republic of ChinaApproving department: Ministry of Construction of the People's Republic of ChinaEffective date: January 1994
Engineering construction standard full-text information system
Engineering construction standard full-text information system
Notice of the relevant authorities on the promulgation of the national standard "Engineering Technical Specifications for Civilian Closed-Circuit Monitoring Television System"
Construction Standard [1994] No. 199
In accordance with the requirements of the State Planning Commission's document No. Jizong [1986] 2630 and the Ministry of Construction's document No. Jianbiao (1991) 727, the "Engineering Technical Specifications for Civilian Closed-Circuit Monitoring Television System" jointly formulated by the Ministry of Radio, Film and Television and relevant departments has been reviewed by the relevant departments and is now approved as the "Engineering Technical Specifications for Civilian Closed-Circuit Monitoring Television System" GB50198—94 as a mandatory national standard for implementation on November 1, 1994.
This standard is managed by the Ministry of Radio, Film and Television, its specific interpretation and other work is the responsibility of the Wuhan Radio and Television Bureau, and its publication and distribution is organized by the Standard and Norms Research Institute of the Ministry of Construction.
Ministry of Construction of the People's Republic of China
March 11, 1994
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
System Engineering Design
Power Supply, Grounding and Safety Protection
System Engineering Construction
Camera Installation
Line Laying
Power Supply and Grounding
System Engineering Acceptance
General Provisions
System Engineering Construction Quality
System Quality Subjective Evaluation...
System Quality Objective Test
Cross-Work Acceptance Documents
Appendix A
Appendix B
System Engineering Acceptance Certificate
Explanation of Terms Used in This Specification
Additional Explanations
Appendix. Explanation of clauses.
Engineering Construction Standard Full Text Information System
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Engineering Construction Standard Full Text Information System
1 General
1 This specification is formulated to implement the national technical and economic policies in the engineering design and construction of civil closed-circuit surveillance television systems (hereinafter referred to as systems), to achieve advanced technology, economic rationality, safety and applicability, and to ensure quality. 1.0.2 This specification applies to the design, construction and acceptance of new construction, expansion and reconstruction projects of civil closed-circuit television systems with surveillance as the main purpose. 1.0.3
3 The engineering design of the system should strive to reduce the project cost and facilitate construction, maintenance and operation on the premise of meeting the use function and reliable operation. 1.0.4 In addition to complying with this specification, the engineering design and construction of the system shall also comply with the provisions of the relevant current national standards and specifications. Engineering Design Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Engineering Design of the System
2.1 General Provisions
The system format should be consistent with the general television format. 2.1.1
2. Closed-circuit surveillance television should use a black-and-white television system. When color information needs to be observed, a color television system can be used.
2.1.3 The system should consist of four main parts: video, transmission, display and control. When it is necessary to record the image of the monitored target, a tape recording device should be set up. When it is necessary to monitor the sound while monitoring the target, a sound transmission, monitoring and recording system can be configured.
The working environment temperature of the system facilities shall meet the following requirements: Facilities for outdoor work in cold areas:
Facilities for outdoor work in other areas:
Facilities for indoor work:
-40～+35℃
10～+55℃
—5~+40℃
2.1.5 The selection of equipment, components and materials for the system shall comply with the following provisions: 2.1.5.1 Standardized products that comply with the current national and industry standards shall be used; 2.1.5.2
The video input and output impedance of the equipment and components used in the system and the characteristic impedance of the cable shall be 752, and the input and output impedance of the audio equipment shall be high impedance or 600Q;
consistent.
The performance and technical requirements of various supporting equipment selected for the system should be coordinated. Under the standard illumination of the camera, the closed-circuit surveillance image quality and system technical indicators should meet the following requirements:
2.1.6.1 The image quality can be evaluated according to the five-level damage system, and the image quality should not be less than 4 points;
The signal-to-noise ratio corresponding to the 4-point image quality should meet the requirements of Table 2.1.6-1. 2.1.6.2
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Signal-to-noise ratio (dB)
Indicator Item
Random signal-to-noise ratio
Single-color interference
Power supply interference
Pulse interference
Black-and-white television system
Table 2.1.6-1
Color television system
2. 1.6.3 The horizontal definition of the image should not be less than 400 lines for black and white television systems, and should not be less than 270 lines for color television systems;
The grayscale of the image should not be less than level 8
The level of each video signal of the system at the monitor input end should be 1Vp-p3dBVBS;
The signal-to-noise ratio index distribution of each part of the system should comply with the provisions of 2.1.6.6
in Table 2.1.6-2;
Signal-to-noise ratio index distribution of each part of the system (dB) Item
Continuous random signal-to-noise ratio
Camera part
Transmission part
Table 2.1.6-2
Display part
7 When the system is used in low illumination, the monitoring picture should reach a usable image, and its system signal-to-noise ratio shall not be less than 25dB.
Note: ① The five-level damage scoring standard shall comply with the provisions of Table 4.3.1-1 of Article 4.3.1 of this specification. ② VBS is the English abbreviation code for the full television signal composed of image signal, blanking pulse and synchronization pulse.
③ The usable image refers to the image that can identify the outline of the object in the picture when monitoring the low-light picture. 2.1.7 The design plan of the system should be determined based on the following factors: 1 According to the technical and functional requirements of the system, determine the system composition and equipment configuration 2. 1. 7. 1
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
The location of the installation:
Protection measures;
Line routing.
Determine the cameras and other equipment according to the building plan or on-site survey. Determine the camera type and protection according to the monitoring target and environmental conditions. Determine the transmission cable (optical) according to the camera distribution and environmental conditions. 2.2 Camera Part
2.2.1 Select cameras with different sensitivities according to the illumination of the monitoring target. The minimum environmental illumination of the monitoring target should be 10 times higher than the minimum illumination of the camera. 2.2.2 The selection of camera lenses should comply with the following provisions: 2.2.2.1 The focal length of the lens should be determined according to the size of the field of view and the distance between the lens and the surveillance target, and calculated according to the following formula:
F=A·L
Where F is the focal length (mm);
A is the image field height (mm);
L is the object distance (mm);
H is the field of view height (mm).
When photographing a fixed surveillance target, a fixed focal length lens can be selected; when the viewing distance is small and the viewing angle is large, a wide-angle lens can be selected; when the viewing distance is large, a telephoto lens can be selected; when it is necessary to change the viewing angle of the surveillance target or the viewing angle range is large, a zoom lens should be selected.
2.2.2.2 Except for the antimony sulfide camera tube, when the illumination of the surveillance target changes, an aperture adjustable lens should be used.
2.2.2.3When remote control is required, a remote control lens device with optical focus, aperture opening, and zoom can be selected.
2.2.3 Cameras can be small, light, and easy to install and repair on site. ||tt| ... 2.2.8 The camera’s installation location, camera direction and lighting conditions shall comply with the following provisions:
2.2.8.1 The camera should be installed near the target to be monitored and not easily damaged by the outside world. The installation location should not affect the operation of on-site equipment and the normal activities of personnel. The installation height should be 2.5 to 5 meters from the ground indoors; 3.5 to 10 meters from the ground outdoors, and should not be lower than 3.5 meters.
The camera in the elevator car should be installed on the top of the elevator car and at the diagonal of the elevator operator, and should be able to monitor the entire elevator car. 2.2.8.3 The camera lens should avoid direct strong light to ensure that the target surface of the camera tube is not damaged. There should be no objects that block the target within the lens field of view. 2.2.8.4 The camera lens should be aimed at the target to be monitored from the direction of the light source, and should avoid backlight installation; when backlight installation is required, the contrast of the monitored area should be reduced. 2.3 Transmission part
2.3.1 The image signal transmission method of the system should comply with the following provisions: 2.3.1.1 When the transmission distance is short, the video transmission method of transmitting the video baseband signal through coaxial cable can be adopted.
When the unevenness of the transmitted black and white TV baseband signal at the 5MHz point is greater than 3dB, a cable equalizer should be added; when it is greater than 6dB, a cable equalizer amplifier should be added. When the unevenness of the transmitted color TV baseband signal at the 5.5MHz point is greater than 3dB, a cable equalizer should be added; when it is greater than 6dB, a cable equalizer amplifier should be added.
2.3.1.2 When the transmission distance is long, the monitoring points are widely distributed, or it is necessary to enter the cable TV network, the RF transmission method of transmitting the RF modulated signal through coaxial cable should be adopted. 2.3.1.3 For long-distance transmission or transmission that needs to avoid strong electromagnetic field interference, it is advisable to use optical cable transmission for transmitting optical modulated signals. When there is a lightning protection requirement, metal-free optical cable should be used.
2.3.2 The control signal of the system can be directly transmitted by multi-core wire or the remote control signal can be digitally encoded and transmitted by electrical (optical) cable. 2.3.3 The selection of transmission electrical and optical cables should meet the following requirements: 2.3.3.1 Coaxial cables with thinner wire diameters should be selected while meeting the requirements of attenuation, shielding, bending and moisture resistance; 2.3.3.2 The selection of optical cables should meet the requirements of attenuation, bandwidth, temperature characteristics, physical characteristics, moisture resistance, etc.
2.3.4 The selection of the outer sheath of the optical cable shall comply with the following provisions: 2.3.4.1 When the optical cable is laid in pipelines or overhead, an aluminum-polyethylene bonded sheath shall be used;
2.3.4.2 When the optical cable is directly buried, an oil-filled aluminum-plastic bonded and armored polyethylene outer sheath shall be used;
2.3.4.3 When the optical cable is laid indoors, a polyvinyl chloride outer sheath or other plastic flame-retardant sheath shall be used. When a polyethylene sheath is used, effective fire prevention measures shall be taken;
2.3.4.4 When the optical cable is laid underwater, an aluminum-plastic bonded (or aluminum sheath, lead sheath, steel sheath) steel wire armored polyethylene outer sheath shall be used; 2.3.4.5 For optical cable lines without metal, a polyethylene outer sheath or a fiber-reinforced plastic sheath shall be used.
2.3.5 When decoding boxes and optical components are used outdoors, they should have a good closed and waterproof structure. Optical cable joints should be equipped with joint sheaths, and waterproof, moisture-proof and anti-corrosion measures should be taken.
3 The routing design of transmission lines should meet the following requirements: 2.3.6
2.3.6.1 The route should be short, safe and reliable, and easy to construct and maintain; 2.3.6.2
Avoid harsh environmental conditions or areas that are prone to pipeline damage; 3 It should not cross with other pipelines and other obstacles. 2.3.6.3bZxz.net
2.3.7 The laying of outdoor transmission lines should meet the following requirements: When laying using communication pipelines (including tunnels and troughs), it should not overlap with communication pipelines. 2.3. 7.1
Communication cable common conduit hole,
When the cable is laid in the same trench (tunnel) with other lines, the minimum spacing 2.3.7.2
shall comply with the provisions of Table 2.3.7-1;
The minimum distance (m) between the cable and other lines in the same trench (tunnel)
220V AC power supply line
Communication cable
Minimum spacing
Table 2.3.7-1
When the overhead cable is laid on the same pole with other lines, the minimum vertical spacing between the two lines shall comply with the provisions of Table 2.3.7-2; The minimum vertical distance (m) between the cable and other lines on the same pole
1~10kV power lines
Power lines below 1kV
Broadcasting lines
Communication lines
Table 2.3.7-2
Minimum vertical spacing
When the lines are laid in urban areas and rural areas, direct burial can be adopted. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
When the lines are laid through buildings, they can be laid along the wall; 2.3.7.6
When the lines cross rivers, they should be laid in pipes or troughs on bridges. When there are no bridges, overhead laying or underwater laying can be adopted. 2.3.8 The selection of indoor transmission line laying methods shall meet the following requirements: 2.3.8.1 For electric (optical) cable lines in buildings without mechanical damage, or for expansion and reconstruction projects, the open laying method along the wall can be adopted; 2.3.8.2
In buildings where pipelines are required to be concealed or newly built, the concealed pipe laying method can be adopted,
The lines laid;
Open pipe wiring can be adopted in the following situations:
Vulnerable to external damage;
There are many other pipelines and obstacles on the line route, and it is not suitable to be exposed (3) In dangerous places susceptible to electromagnetic interference or flammable and explosive places; 2.3.8.4 When the cable is laid parallel to or crossed with the power line, the distance between them shall not be less than 0.3m, and when it is laid parallel to or crossed with the communication line, the distance between them shall not be less than 0.1m. 2.3.9 Coaxial cable should be laid in conduit or cable trough. When there is strong electromagnetic interference near the line, the cable should be passed through a metal pipe and buried underground. When overhead laying must be adopted, anti-interference measures should be taken. 2.3.10 Line laying should comply with the provisions of the current national standard "Industrial Enterprise Communication Design Specifications".
2.4 Monitoring room
2.4.1 According to the size of the system, it is advisable to set up a monitoring point or monitoring room. The design of the monitoring room shall comply with the following provisions:
2.4.1.1 The monitoring room should be set up in a place with less environmental noise; the usable area of the monitoring room should be determined according to the equipment capacity, and it should be 12~2.4.1.2
2.4.1.3 The floor of the monitoring room should be smooth, flat and dust-free. The width of the door should not be less than 0.9m, and the height should not be less than 2.1m; Engineering Construction Standard Full Text Information System2.2.2 Except for antimony sulfide video tubes, when the illumination of the monitored target changes, an aperture adjustable lens should be used.
2.2.2.3 When remote control is required, a remote control lens device with optical focus, aperture opening and zoom can be selected.
2.2.3 The camera can be a charge coupled device (CCD) camera with small size, light weight, easy on-site installation and maintenance. 2.2.4 The corresponding camera protective cover should be selected according to the working environment. The protective cover can be equipped with a temperature control system and a remote control wiper as required. 2.2.5 The support device for fixing the camera on a specific part can be a camera bracket or a pan-tilt head. When a camera needs to monitor multiple scenes in different directions, it should be equipped with an automatic focusing device and a remote control electric pan-tilt head. 2.2.6 When the camera needs to be hidden, it can be installed in the ceiling or wall, and the lens can be a pinhole or prism lens. For the anti-theft system, additional external sensors can be installed and combined with the system to conduct linkage alarm.
2.2.7 The system equipment for monitoring underwater targets should use high-sensitivity video tubes and sealed pressure-resistant and waterproof protective covers, as well as water seepage alarm devices. 2.2.8 The camera installation position, camera direction and lighting conditions should comply with the following regulations:
2.2.8.1 The camera should be installed in a place near the monitored target that is not easily damaged by the outside world. The installation position should not affect the operation of on-site equipment and the normal activities of personnel. The installation height should be 2.5 to 5 meters from the ground indoors; 3.5 to 10 meters from the ground outdoors, and should not be lower than 3.5 meters.
The camera in the elevator car should be installed on the top of the elevator car and at the diagonal of the elevator operator, and should be able to monitor the entire elevator car. 2.2.8.3 The camera lens should avoid direct strong light to ensure that the target surface of the video tube is not damaged. There should be no objects that block the monitored target in the lens field of view. 2.2.8.4 The camera lens should be aimed at the monitoring target from the direction of the light source, and should avoid backlight installation; when backlight installation is required, the contrast of the monitoring area should be reduced. 2.3 Transmission part
2.3.1 The image signal transmission method of the system should comply with the following provisions: 2.3.1.1 If the transmission distance is short, the video transmission method of coaxial cable transmission of video baseband signal can be adopted.
When the unevenness of the transmitted black and white TV baseband signal at the 5MHz point is greater than 3dB, a cable equalizer should be added; when it is greater than 6dB, a cable equalizer amplifier should be added. When the unevenness of the transmitted color TV baseband signal at the 5.5MHz point is greater than 3dB, a cable equalizer should be added; when it is greater than 6dB, a cable equalizer amplifier should be added.
2.3.1.2 When the transmission distance is long, the monitoring points are widely distributed, or when it is necessary to enter the cable television network, it is advisable to use the radio frequency transmission method of coaxial cable to transmit radio frequency modulated signals. 2.3.1.3 For long-distance transmission or transmission that needs to avoid strong electromagnetic field interference, it is advisable to use optical cable transmission to transmit optical modulated signals. When there is a lightning protection requirement, metal-free optical cable should be used.
2.3.2 The control signal of the system can be directly transmitted by multi-core wire or the remote control signal can be digitally encoded and transmitted by electrical (optical) cable. 2.3.3 The selection of transmission electrical and optical cables should meet the following requirements: 2.3.3.1 Coaxial cables should meet the requirements of attenuation, shielding, bending and moisture resistance. Coaxial cables with thinner wire diameters should be selected; 2.3.3.2 The selection of optical cables should meet the requirements of attenuation, bandwidth, temperature characteristics, physical characteristics, moisture resistance, etc.
2.3.4 The selection of the outer sheath of the optical cable shall comply with the following provisions: 2.3.4.1 When the optical cable is laid in pipelines or overhead, an aluminum-polyethylene bonded sheath shall be used;
2.3.4.2 When the optical cable is directly buried, an oil-filled aluminum-plastic bonded and armored polyethylene outer sheath shall be used;
2.3.4.3 When the optical cable is laid indoors, a polyvinyl chloride outer sheath or other plastic flame-retardant sheath shall be used. When a polyethylene sheath is used, effective fire prevention measures shall be taken;
2.3.4.4 When the optical cable is laid underwater, an aluminum-plastic bonded (or aluminum sheath, lead sheath, steel sheath) steel wire armored polyethylene outer sheath shall be used; 2.3.4.5 For optical cable lines without metal, a polyethylene outer sheath or a fiber-reinforced plastic sheath shall be used.
2.3.5 When decoding boxes and optical components are used outdoors, they should have a good closed and waterproof structure. Optical cable joints should be equipped with joint sheaths, and waterproof, moisture-proof and anti-corrosion measures should be taken.
3 The routing design of transmission lines should meet the following requirements: 2.3.6
2.3.6.1 The route should be short, safe and reliable, and easy to construct and maintain; 2.3.6.2
Avoid harsh environmental conditions or areas that are prone to pipeline damage; 3 It should not cross with other pipelines and other obstacles. 2.3.6.3
2.3.7 The laying of outdoor transmission lines should meet the following requirements: When laying using communication pipelines (including tunnels and troughs), it should not overlap with communication pipelines. 2.3. 7.1
Communication cable common conduit hole,
When the cable is laid in the same trench (tunnel) with other lines, the minimum spacing 2.3.7.2
shall comply with the provisions of Table 2.3.7-1;
The minimum distance (m) between the cable and other lines in the same trench (tunnel)
220V AC power supply line
Communication cable
Minimum spacing
Table 2.3.7-1
When the overhead cable is laid on the same pole with other lines, the minimum vertical spacing between the two lines shall comply with the provisions of Table 2.3.7-2; The minimum vertical distance (m) between the cable and other lines on the same pole
1~10kV power lines
Power lines below 1kV
Broadcasting lines
Communication lines
Table 2.3.7-2
Minimum vertical spacing
When the lines are laid in urban areas and rural areas, direct burial can be adopted. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
When the lines are laid through buildings, they can be laid along the wall; 2.3.7.6
When the lines cross rivers, they should be laid in pipes or troughs on bridges. When there are no bridges, overhead laying or underwater laying can be adopted. 2.3.8 The selection of indoor transmission line laying methods shall meet the following requirements: 2.3.8.1 For electric (optical) cable lines in buildings without mechanical damage, or for expansion and reconstruction projects, the open laying method along the wall can be adopted; 2.3.8.2
In buildings where pipelines are required to be concealed or newly built, the concealed pipe laying method can be adopted,
The lines laid;
Open pipe wiring can be adopted in the following situations:
Vulnerable to external damage;
There are many other pipelines and obstacles on the line route, and it is not suitable to be exposed (3) In dangerous places susceptible to electromagnetic interference or flammable and explosive places; 2.3.8.4 When the cable is laid parallel to or crossed with the power line, the distance between them shall not be less than 0.3m, and when it is laid parallel to or crossed with the communication line, the distance between them shall not be less than 0.1m. 2.3.9 Coaxial cable should be laid in conduit or cable trough. When there is strong electromagnetic interference near the line, the cable should be passed through a metal pipe and buried underground. When overhead laying must be adopted, anti-interference measures should be taken. 2.3.10 Line laying should comply with the provisions of the current national standard "Industrial Enterprise Communication Design Specifications".
2.4 Monitoring room
2.4.1 According to the size of the system, it is advisable to set up a monitoring point or monitoring room. The design of the monitoring room shall comply with the following provisions:
2.4.1.1 The monitoring room should be set up in a place with less environmental noise; the usable area of the monitoring room should be determined according to the equipment capacity, and it should be 12~2.4.1.2
2.4.1.3 The floor of the monitoring room should be smooth, flat and dust-free. The width of the door should not be less than 0.9m, and the height should not be less than 2.1m; Engineering Construction Standard Full Text Information System2.2.2 Except for antimony sulfide video tubes, when the illumination of the monitored target changes, an aperture adjustable lens should be used.
2.2.2.3 When remote control is required, a remote control lens device with optical focus, aperture opening and zoom can be selected.
2.2.3 The camera can be a charge coupled device (CCD) camera with small size, light weight, easy on-site installation and maintenance. 2.2.4 The corresponding camera protective cover should be selected according to the working environment. The protective cover can be equipped with a temperature control system and a remote control wiper as required. 2.2.5 The support device for fixing the camera on a specific part can be a camera bracket or a pan-tilt head. When a camera needs to monitor multiple scenes in different directions, it should be equipped with an automatic focusing device and a remote control electric pan-tilt head. 2.2.6 When the camera needs to be hidden, it can be installed in the ceiling or wall, and the lens can be a pinhole or prism lens. For the anti-theft system, additional external sensors can be installed and combined with the system to conduct linkage alarm.
2.2.7 The system equipment for monitoring underwater targets should use high-sensitivity video tubes and sealed pressure-resistant and waterproof protective covers, as well as water seepage alarm devices. 2.2.8 The camera installation position, camera direction and lighting conditions should comply with the following regulations:
2.2.8.1 The camera should be installed in a place near the monitored target that is not easily damaged by the outside world. The installation position should not affect the operation of on-site equipment and the normal activities of personnel. The installation height should be 2.5 to 5 meters from the ground indoors; 3.5 to 10 meters from the ground outdoors, and should not be lower than 3.5 meters.
The camera in the elevator car should be installed on the top of the elevator car and at the diagonal of the elevator operator, and should be able to monitor the entire elevator car. 2.2.8.3 The camera lens should avoid direct strong light to ensure that the target surface of the video tube is not damaged. There should be no objects that block the monitored target in the lens field of view. 2.2.8.4 The camera lens should be aimed at the monitoring target from the direction of the light source, and should avoid backlight installation; when backlight installation is required, the contrast of the monitoring area should be reduced. 2.3 Transmission part
2.3.1 The image signal transmission method of the system should comply with the following provisions: 2.3.1.1 If the transmission distance is short, the video transmission method of coaxial cable transmission of video baseband signal can be adopted.
When the unevenness of the transmitted black and white TV baseband signal at the 5MHz point is greater than 3dB, a cable equalizer should be added; when it is greater than 6dB, a cable equalizer amplifier should be added. When the unevenness of the transmitted color TV baseband signal at the 5.5MHz point is greater than 3dB, a cable equalizer should be added; when it is greater than 6dB, a cable equalizer amplifier should be added.
2.3.1.2 When the transmission distance is long, the monitoring points are widely distributed, or when it is necessary to enter the cable television network, it is advisable to use the radio frequency transmission method of coaxial cable to transmit radio frequency modulated signals. 2.3.1.3 For long-distance transmission or transmission that needs to avoid strong electromagnetic field interference, it is advisable to use optical cable transmission to transmit optical modulated signals. When there is a lightning protection requirement, metal-free optical cable should be used.
2.3.2 The control signal of the system can be directly transmitted by multi-core wire or the remote control signal can be digitally encoded and transmitted by electrical (optical) cable. 2.3.3 The selection of transmission electrical and optical cables should meet the following requirements: 2.3.3.1 Coaxial cables should meet the requirements of attenuation, shielding, bending and moisture resistance. Coaxial cables with thinner wire diameters should be selected; 2.3.3.2 The selection of optical cables should meet the requirements of attenuation, bandwidth, temperature characteristics, physical characteristics, moisture resistance, etc.
2.3.4 The selection of the outer sheath of the optical cable shall comply with the following provisions: 2.3.4.1 When the optical cable is laid in pipelines or overhead, an aluminum-polyethylene bonded sheath shall be used;
2.3.4.2 When the optical cable is directly buried, an oil-filled aluminum-plastic bonded and armored polyethylene outer sheath shall be used;
2.3.4.3 When the optical cable is laid indoors, a polyvinyl chloride outer sheath or other plastic flame-retardant sheath shall be used. When a polyethylene sheath is used, effective fire prevention measures shall be taken;
2.3.4.4 When the optical cable is laid underwater, an aluminum-plastic bonded (or aluminum sheath, lead sheath, steel sheath) steel wire armored polyethylene outer sheath shall be used; 2.3.4.5 For optical cable lines without metal, a polyethylene outer sheath or a fiber-reinforced plastic sheath shall be used.
2.3.5 When decoding boxes and optical components are used outdoors, they should have a good closed and waterproof structure. Optical cable joints should be equipped with joint sheaths, and waterproof, moisture-proof and anti-corrosion measures should be taken.
3 The routing design of transmission lines should meet the following requirements: 2.3.6
2.3.6.1 The route should be short, safe and reliable, and easy to construct and maintain; 2.3.6.2
Avoid harsh environmental conditions or areas that are prone to pipeline damage; 3 It should not cross with other pipelines and other obstacles. 2.3.6.3
2.3.7 The laying of outdoor transmission lines should meet the following requirements: When laying using communication pipelines (including tunnels and troughs), it should not overlap with communication pipelines. 2.3. 7.1
Communication cable common conduit hole,
When the cable is laid in the same trench (tunnel) with other lines, the minimum spacing 2.3.7.2
shall comply with the provisions of Table 2.3.7-1;
The minimum distance (m) between the cable and other lines in the same trench (tunnel)
220V AC power supply line
Communication cable
Minimum spacing
Table 2.3.7-1
When the overhead cable is laid on the same pole with other lines, the minimum vertical spacing between the two lines shall comply with the provisions of Table 2.3.7-2; The minimum vertical distance (m) between the cable and other lines on the same pole
1~10kV power lines
Power lines below 1kV
Broadcasting lines
Communication lines
Table 2.3.7-2
Minimum vertical spacing
When the lines are laid in urban areas and rural areas, direct burial can be adopted. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
When the lines are laid through buildings, they can be laid along the wall; 2.3.7.6
When the lines cross rivers, they should be laid in pipes or troughs on bridges. When there are no bridges, overhead laying or underwater laying can be adopted. 2.3.8 The selection of indoor transmission line laying methods shall meet the following requirements: 2.3.8.1 For electric (optical) cable lines in buildings without mechanical damage, or for expansion and reconstruction projects, the open laying method along the wall can be adopted; 2.3.8.2
In buildings where pipelines are required to be concealed or newly built, the concealed pipe laying method can be adopted,
The lines laid;
Open pipe wiring can be adopted in the following situations:
Vulnerable to external damage;
There are many other pipelines and obstacles on the line route, and it is not suitable to be exposed (3) In dangerous places susceptible to electromagnetic interference or flammable and explosive places; 2.3.8.4 When the cable is laid parallel to or crossed with the power line, the distance between them shall not be less than 0.3m, and when it is laid parallel to or crossed with the communication line, the distance between them shall not be less than 0.1m. 2.3.9 Coaxial cable should be laid in conduit or cable trough. When there is strong electromagnetic interference near the line, the cable should be passed through a metal pipe and buried underground. When overhead laying must be adopted, anti-interference measures should be taken. 2.3.10 Line laying should comply with the provisions of the current national standard "Industrial Enterprise Communication Design Specifications".
2.4 Monitoring room
2.4.1 According to the size of the system, it is advisable to set up a monitoring point or monitoring room. The design of the monitoring room shall comply with the following provisions:
2.4.1.1 The monitoring room should be set up in a place with less environmental noise; the usable area of the monitoring room should be determined according to the equipment capacity, and it should be 12~2.4.1.2
2.4.1.3 The floor of the monitoring room should be smooth, flat and dust-free. The width of the door should not be less than 0.9m, and the height should not be less than 2.1m; Engineering Construction Standard Full Text Information System5 The support device for fixing the camera on a specific part can be a camera bracket or a pan/tilt. When a camera needs to monitor scenes in multiple different directions, it should be equipped with an automatic focusing device and a remote-controlled electric pan/tilt. 2.2.6 When the camera needs to be hidden, it can be installed in the ceiling or wall, and the lens can be a pinhole or prism lens. For the anti-theft system, additional external sensors can be installed and combined with the system to perform linkage alarms.
2.2.7 The system equipment for monitoring underwater targets should use high-sensitivity camera tubes and sealed pressure-resistant and waterproof protective covers, as well as water seepage alarm devices. 2.2.8 The camera installation location, camera direction and lighting conditions should comply with the following regulations:
2.2.8.1 The camera should be installed in a place near the monitored target that is not easily damaged by the outside world. The installation location should not affect the operation of on-site equipment and the normal activities of personnel. The installation height should be 2.5 to 5 meters from the ground indoors; 3.5 to 10 meters from the ground outdoors, and should not be lower than 3.5 meters.
The camera in the elevator car should be installed on the top of the elevator car and at the diagonal of the elevator operator, and should be able to monitor the panoramic view of the elevator car. 2.2.8.3 The camera lens should avoid direct strong light to ensure that the target surface of the camera tube is not damaged. There should be no objects that block the monitored target in the lens field of view. 2.2.8.4 The camera lens should be aimed at the monitored target from the direction of the light source, and should avoid backlight installation; when backlight installation is required, the contrast of the monitored area should be reduced. 2.3 Transmission part
2.3.1 The image signal transmission method of the system should comply with the following provisions: 2.3.1.1 For short transmission distances, the video transmission method of coaxial cable transmission of video baseband signals can be used.
When the unevenness of the transmitted black and white TV baseband signal at the 5MHz point is greater than 3dB, a cable equalizer should be added. When it is greater than 6dB, a cable equalization amplifier should be added. When the unevenness of the transmitted color TV baseband signal at 5.5MHz is greater than 3dB, a cable equalizer should be added; when it is greater than 6dB, a cable equalizer amplifier should be added.
2.3.1.2 When the transmission distance is long, the monitoring points are widely distributed, or it is necessary to enter the cable TV network, it is advisable to use the RF transmission method of coaxial cable to transmit RF modulated signals. 2.3.1.3 For long-distance transmission or transmission that needs to avoid strong electromagnetic field interference, it is advisable to use optical cable transmission to transmit optical modulated signals. When there is a lightning protection requirement, metal-free optical cable should be used.
2.3.2 The control signal of the system can be directly transmitted using multi-core wires or the remote control signal can be digitally encoded and transmitted using electrical (optical) cables. 2.3.3 The selection of transmission power and optical cables shall meet the following requirements: 2.3.3.1 Coaxial cables with thinner wire diameters shall be selected while meeting the requirements of attenuation, shielding, bending and moisture resistance; 2.3.3.2 The selection of optical cables shall meet the requirements of attenuation, bandwidth, temperature characteristics, physical characteristics and moisture resistance.
2.3.4 The selection of the outer sheath of the optical cable shall meet the following provisions: 2.3.4.1 When the optical cable is laid in pipelines or overhead, an aluminum-polyethylene bonding sheath shall be adopted;
2.3.4.2 When the optical cable is directly buried, an oil-filled aluminum-plastic bonding and armored polyethylene outer sheath shall be adopted;
2.3.4.3 When the optical cable is laid indoors, a polyvinyl chloride outer sheath or other plastic flame-retardant sheath shall be adopted. When polyethylene sheath is used, effective fire prevention measures should be taken;
2.3.4.4 When the optical cable is laid underwater, aluminum-plastic bonded (or aluminum sheath, lead sheath, steel sheath) steel wire armored polyethylene outer sheath should be used; 2.3.4.5 For metal-free optical cable lines, polyethylene outer sheath or fiber reinforced plastic sheath should be used.
2.3.5 When decoding boxes and optical components are used outdoors, they should have a good closed and waterproof engineering construction standard full text information system
engineering construction standard full text information system
structure. Optical cable joints should be equipped with joint sheaths, and waterproof, moisture-proof and corrosion-proof measures should be taken.
3 The routing design of transmission lines shall meet the following requirements: 2.3.6
2.3.6.1 The route shall be short, safe, reliable, and easy to construct and maintain; 2.3.6.2
Avoid harsh environmental conditions or areas that may easily damage the pipeline; 3 It should not cross other pipelines or other obstacles. 2.3.6.3
2.3.7 The laying of outdoor transmission lines shall meet the following requirements: When laying using communication pipelines (including tunnels and troughs), it should not cross with communication pipelines. 2.3.6.3
2.3.7 The laying of outdoor transmission lines shall meet the following requirements: When laying using communication pipelines (including tunnels and troughs), it should not cross with communication pipelines. 7.1
Communication cable common conduit hole,
When the cable is laid in the same trench (tunnel) with other lines, the minimum spacing 2.3.7.2
shall comply with the provisions of Table 2.3.7-1;
The minimum distance (m) between the cable and other lines in the same trench (tunnel)
220V AC power supply line
Communication cable
Minimum spacing
Table 2.3.7-1
When the overhead cable is laid on the same pole with other lines, the minimum vertical spacing between the two lines shall comply with the provisions of Table 2.3.7-2; The minimum vertical distance (m) between the cable and other lines on the same pole
1~10kV power lines
Power lines below 1kV
Broadcasting lines
Communication lines
Table 2.3.7-2
Minimum vertical spacing
When the lines are laid in urban areas and rural areas, direct burial can be adopted. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
When the lines are laid through buildings, they can be laid along the wall; 2.3.7.6
When the lines cross rivers, they should be laid in pipes or troughs on bridges. When there are no bridges, overhead laying or underwater laying can be adopted. 2.3.8 The selection of indoor transmission line laying methods shall meet the following requirements: 2.3.8.1 For electric (optical) cable lines in buildings without mechanical damage, or for expansion and reconstruction projects, the open laying method along the wall can be adopted; 2.3.8.2
In buildings where pipelines are required to be concealed or newly built, the concealed pipe laying method can be adopted,
The lines laid;
Open pipe wiring can be adopted in the following situations:
Vulnerable to external damage;
There are many other pipelines and obstacles on the line route, and it is not suitable to be exposed (3) In dangerous places susceptible to electromagnetic interference or flammable and explosive places; 2.3.8.4 When the cable is laid parallel to or crossed with the power line, the distance between them shall not be less than 0.3m, and when it is laid parallel to or crossed with the communication line, the distance between them shall not be less than 0.1m. 2.3.9 Coaxial cable should be laid in conduit or cable trough. When there is strong electromagnetic interference near the line, the cable should be passed through a metal pipe and buried underground. When overhead laying must be adopted, anti-interference measures should be taken. 2.3.10 Line laying should comply with the provisions of the current national standard "Industrial Enterprise Communication Design Specifications".
2.4 Monitoring room
2.4.1 According to the size of the system, it is advisable to set up a monitoring point or monitoring room. The design of the monitoring room shall comply with the following provisions:
2.4.1.1 The monitoring room should be set up in a place with less environmental noise; the usable area of the monitoring room should be determined according to the equipment capacity, and it should be 12~2.4.1.2
2.4.1.3 The floor of the monitoring room should be smooth, flat and dust-free. The width of the door should not be less than 0.9m, and the height should not be less than 2.1m; Engineering Construction Standard Full Text Information System5 The support device for fixing the camera on a specific part can be a camera bracket or a pan/tilt. When a camera needs to monitor scenes in multiple different directions, it should be equipped with an automatic focusing device and a remote-controlled electric pan/tilt. 2.2.6 When the camera needs to be hidden, it can be installed in the ceiling or wall, and the lens can be a pinhole or prism lens. For the anti-theft system, additional external sensors can be installed and combined with the system to perform linkage alarms.
2.2.7 The system equipment for monitoring underwater targets should use high-sensitivity camera tubes and sealed pressure-resistant and waterproof protective covers, as well as water seepage alarm devices. 2.2.8 The camera installation location, camera direction and lighting conditions should comply with the following regulations:
2.2.8.1 The camera should be installed in a place near the monitored target that is not easily damaged by the outside world. The installation location should not affect the operation of on-site equipment and the normal activities of personnel. The installation height should be 2.5 to 5 meters from the ground indoors; 3.5 to 10 meters from the ground outdoors, and should not be lower than 3.5 meters.
The camera in the elevator car should be installed on the top of the elevator car and at the diagonal of the elevator operator, and should be able to monitor the panoramic view of the elevator car. 2.2.8.3 The camera lens should avoid direct strong light to ensure that the target surface of the camera tube is not damaged. There should be no objects that block the monitored target in the lens field of view. 2.2.8.4 The camera lens should be aimed at the monitored target from the direction of the light source, and should avoid backlight installation; when backlight installation is required, the contrast of the monitored area should be reduced. 2.3 Transmission part
2.3.1 The image signal transmission method of the system should comply with the following provisions: 2.3.1.1 For short transmission distances, the video transmission method of coaxial cable transmission of video baseband signals can be used.
When the unevenness of the transmitted black and white TV baseband signal at the 5MHz point is greater than 3dB, a cable equalizer should be added. When it is greater than 6dB, a cable equalization amplifier should be added. When the unevenness of the transmitted color TV baseband signal at 5.5MHz is greater than 3dB, a cable equalizer should be added; when it is greater than 6dB, a cable equalizer amplifier should be added.
2.3.1.2 When the transmission distance is long, the monitoring points are widely distributed, or it is necessary to enter the cable TV network, it is advisable to use the RF transmission method of coaxial cable to transmit RF modulated signals. 2.3.1.3 For long-distance transmission or transmission that needs to avoid strong electromagnetic field interference, it is advisable to use optical cable transmission to transmit optical modulated signals. When there is a lightning protection requirement, metal-free optical cable should be used.
2.3.2 The control signal of the system can be directly transmitted using multi-core wires or the remote control signal can be digitally encoded and transmitted using electrical (optical) cables. 2.3.3 The selection of transmission power and optical cables shall meet the following requirements: 2.3.3.1 Coaxial cables with thinner wire diameters shall be selected while meeting the requirements of attenuation, shielding, bending and moisture resistance; 2.3.3.2 The selection of optical cables shall meet the requirements of attenuation, bandwidth, temperature characteristics, physical characteristics and moisture resistance.
2.3.4 The selection of the outer sheath of the optical cable shall meet the following provisions: 2.3.4.1 When the optical cable is laid in pipelines or overhead, an aluminum-polyethylene bonding sheath shall be adopted;
2.3.4.2 When the optical cable is directly buried, an oil-filled aluminum-plastic bonding and armored polyethylene outer sheath shall be adopted;
2.3.4.3 When the optical cable is laid indoors, a polyvinyl chloride outer sheath or other plastic flame-retardant sheath shall be adopted. When polyethylene sheath is used, effective fire prevention measures should be taken;
2.3.4.4 When the optical cable is laid underwater, aluminum-plastic bonded (or aluminum sheath, lead sheath, steel sheath) steel wire armored polyethylene outer sheath should be used; 2.3.4.5 For metal-free optical cable lines, polyethylene outer sheath or fiber reinforced plastic sheath should be used.
2.3.5 When decoding boxes and optical components are used outdoors, they should have a good closed and waterproof engineering construction standard full text information system
engineering construction standard full text information system
structure. Optical cable joints should be equipped with joint sheaths, and waterproof, moisture-proof and corrosion-proof measures should be taken.
3 The routing design of transmission lines shall meet the following requirements: 2.3.6
2.3.6.1 The route shall be short, safe, reliable, and easy to construct and maintain; 2.3.6.2
Avoid harsh environmental conditions or areas that may easily damage the pipeline; 3 It should not cross other pipelines or other obstacles. 2.3.6.3
2.3.7 The laying of outdoor transmission lines shall meet the following requirements: When laying using communication pipelines (including tunnels and troughs), it should not cross with communication pipelines. 2.3.6.3
2.3.7 The laying of outdoor transmission lines shall meet the following requirements: When laying using communication pipelines (including tunnels and troughs), it should not cross with communication pipelines. 7.1
Communication cable common conduit hole,
When the cable is laid in the same trench (tunnel) with other lines, the minimum spacing 2.3.7.2
shall comply with the provisions of Table 2.3.7-1;
The minimum distance (m) between the cable and other lines in the same trench (tunnel)
220V AC power supply line
Communication cable
Minimum spacing
Table 2.3.7-1
When the overhead cable is laid on the same pole with other lines, the minimum vertical spacing between the two lines shall comply with the provisions of Table 2.3.7-2; The minimum vertical distance (m) between the cable and other lines on the same pole
1~10kV power lines
Power lines below 1kV
Broadcasting lines
Communication lines
Table 2.3.7-2
Minimum vertical spacing
When the lines are laid in urban areas and rural areas, direct burial can be adopted. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
When the lines are laid through buildings, they can be laid along the wall; 2.3.7.6
When the lines cross rivers, they should be laid in pipes or troughs on bridges. When there are no bridges, overhead laying or underwater laying can be adopted. 2.3.8 The selection of indoor transmission line laying methods shall meet the following requirements: 2.3.8.1 For electric (optical) cable lines in buildings without mechanical damage, or for expansion and reconstruction projects, the open laying method along the wall can be adopted; 2.3.8.2
In buildings where pipelines are required to be concealed or newly built, the concealed pipe laying method can be adopted,
The lines laid;
Open pipe wiring can be adopted in the following situations:
Vulnerable to external damage;
There are many other pipelines and obstacles on the line route, and it is not suitable to be exposed (3) In dangerous places susceptible to electromagnetic interference or flammable and explosive places; 2.3.8.4 When the cable is laid parallel to or crossed with the power line, the distance between them shall not be less than 0.3m, and when it is laid parallel to or crossed with the communication line, the distance between them shall not be less than 0.1m. 2.3.9 Coaxial cable should be laid in conduit or cable trough. When there is strong electromagnetic interference near the line, the cable should be passed through a metal pipe and buried underground. When overhead laying must be adopted, anti-interference measures should be taken. 2.3.10 Line laying should comply with the provisions of the current national standard "Industrial Enterprise Communication Design Specifications".
2.4 Monitoring room
2.4.1 According to the size of the system, it is advisable to set up a monitoring point or monitoring room. The design of the monitoring room shall comply with the following provisions:
2.4.1.1 The monitoring room should be set up in a place with less environmental noise; the usable area of the monitoring room should be determined according to the equipment capacity, and it should be 12~2.4.1.2
2.4.1.3 The floor of the monitoring room should be smooth, flat and dust-free. The width of the door should not be less than 0.9m, and the height should not be less than 2.1m; Engineering Construction Standard Full Text Information System1When the transmission distance is short, the video transmission method of transmitting the video baseband signal through coaxial cable can be adopted.
When the unevenness of the transmitted black and white TV baseband signal at the 5MHz point is greater than 3dB, a cable equalizer should be added; when it is greater than 6dB, a cable equalizing amplifier should be added. When the unevenness of the transmitted color TV baseband signal at the 5.5MHz point is greater than 3dB, a cable equalizer should be added; when it is greater than 6dB, a cable equalizing amplifier should be added.
2.3.1.2When the transmission distance is long, the monitoring points are widely distributed, or it is necessary to enter the cable TV network, it is advisable to adopt the radio frequency transmission method of transmitting the radio frequency modulated signal through coaxial cable. 2.3.1.3For long-distance transmission or transmission that needs to avoid strong electromagnetic field interference, it is advisable to adopt the optical cable transmission method of transmitting optical modulated signals. When there is a requirement for lightning protection, metal-free optical cable should be used.
2.3.2 The control signal of the system can be directly transmitted by multi-core wires or the remote control signal can be digitally encoded and transmitted by electric (optical) cables. 2.3.3 The selection of transmission electric and optical cables should meet the following requirements: 2.3.3.1 Coaxial cables with thinner wire diameters should be selected under the conditions of meeting the requirements of attenuation, shielding, bending and moisture resistance; 2.3.3.2 The selection of optical cables should meet the requirements of attenuation, bandwidth, temperature characteristics, physical characteristics, moisture resistance, etc.
2.3.4 The selection of the outer sheath of the optical cable should meet the following regulations: 2.3.4.1 When the optical cable is laid in pipelines or overhead, an aluminum-polyethylene bonding sheath should be used;
2.3.4.2 When the optical cable is directly buried, an oil-filled aluminum-plastic bonding and armored polyethylene outer sheath should be used.
2.3.4.3 When the optical cable is laid indoors, a polyvinyl chloride outer sheath or other plastic flame-retardant sheath should be used. When polyethylene sheath is used, effective fire prevention measures should be taken;
2.3.4.4 When the optical cable is laid underwater, aluminum-plastic bonded (or aluminum sheath, lead sheath, steel sheath) steel wire armored polyethylene outer sheath should be used; 2.3.4.5 For metal-free optical cable lines, polyethylene outer sheath or fiber reinforced plastic sheath should be used.
2.3.5 When decoding boxes and optical components are used outdoors, they should have a good closed and waterproof engineering construction standard full text information system
engineering construction standard full text information system
structure. Optical cable joints should be equipped with joint sheaths, and waterproof, moisture-proof and corrosion-proof measures should be taken.
3 The routing design of transmission lines shall meet the following requirements: 2.3.6
2.3.6.1 The route shall be short, safe, reliable, and easy to construct and maintain; 2.3.6.2
Avoid harsh environmental conditions or areas that may easily damage the pipeline; 3 It should not cross other pipelines or other obstacles. 2.3.6.3
2.3.7 The laying of outdoor transmission lines shall meet the following requirements: When laying using communication pipelines (including tunnels and troughs), it should not cross with communication pipelines. 2.3.6.3
2.3.7 The laying of outdoor transmission lines shall meet the following requirements: When laying using communication pipelines (including tunnels and troughs), it should not cross with communication pipelines. 7.1
Communication cable common conduit hole,
When the cable is laid in the same trench (tunnel) with other lines, the minimum spacing 2.3.7.2
shall comply with the provisions of Table 2.3.7-1;
The minimum distance (m) between the cable and other lines in the same trench (tunnel)
220V AC power supply line
Communication cable
Minimum spacing
Table 2.3.7-1
When the overhead cable is laid on the same pole with other lines, the minimum vertical spacing between the two lines shall comply with the provisions of Table 2.3.7-2; The minimum vertical distance (m) between the cable and other lines on the same pole
1~10kV power lines
Power lines below 1kV
Broadcasting lines
Communication lines
Table 2.3.7-2
Minimum vertical spacing
When the lines are laid in urban areas and rural areas, direct burial can be adopted. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
When the lines are laid through buildings, they can be laid along the wall; 2.3.7.6
When the lines cross rivers, they should be laid in pipes or troughs on bridges. When there are no bridges, overhead laying or underwater laying can be adopted. 2.3.8 The selection of indoor transmission line laying methods shall meet the following requirements: 2.3.8.1 For electric (optical) cable lines in buildings without mechanical damage, or for expansion and reconstruction projects, the open laying method along the wall can be adopted; 2.3.8.2
In buildings where pipelines are required to be concealed or newly built, the concealed pipe laying method can be adopted,
The lines laid;
Open pipe wiring can be adopted in the following situations:
Vulnerable to external damage;
There are many other pipelines and obstacles on the line route, and it is not suitable to be exposed (3) In dangerous places susceptible to electromagnetic interference or flammable and explosive places; 2.3.8.4 When the cable is laid parallel to or crossed with the power line, the distance between them shall not be less than 0.3m, and when it is laid parallel to or crossed with the communication line, the distance between them shall not be less than 0.1m. 2.3.9 Coaxial cable should be laid in conduit or cable trough. When there is strong electromagnetic interference near the line, the cable should be passed through a metal pipe and buried underground. When overhead laying must be adopted, anti-interference measures should be taken. 2.3.10 Line laying should comply with the provisions of the current national standard "Industrial Enterprise Communication Design Specifications".
2.4 Monitoring room
2.4.1 According to the size of the system, it is advisable to set up a monitoring point or monitoring room. The design of the monitoring room shall comply with the following provisions:
2.4.1.1 The monitoring room should be set up in a place with less environmental noise; the usable area of the monitoring room should be determined according to the equipment capacity, and it should be 12~2.4.1.2
2.4.1.3 The floor of the monitoring room should be smooth, flat and dust-free. The width of the door should not be less than 0.9m, and the height should not be less than 2.1m; Engineering Construction Standard Full Text Information System1When the transmission distance is short, the video transmission method of transmitting the video baseband signal through coaxial cable can be adopted.
When the unevenness of the transmitted black and white TV baseband signal at the 5MHz point is greater than 3dB, a cable equalizer should be added; when it is greater than 6dB, a cable equalizing amplifier should be added. When the unevenness of the transmitted color TV baseband signal at the 5.5MHz point is greater than 3dB, a cable equalizer should be added; when it is greater than 6dB, a cable equalizing amplifier should be added.
2.3.1.2When the transmission distance is long, the monitoring points are widely distributed, or it is necessary to enter the cable TV network, it is advisable to adopt the radio frequency transmission method of transmitting the radio frequency modulated signal through coaxial cable. 2.3.1.3For long-distance transmission or transmission that needs to avoid strong electromagnetic field interference, it is advisable to adopt the optical cable transmission method of transmitting optical modulated signals. When there is a requirement for lightning protection, metal-free optical cable should be used.
2.3.2 The control signal of the system can be directly transmitted by
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