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Construction plan and process of integrated wiring system
1. The foundation of installation
The installation environment is ready, including: computer room decoration, computer room power supply, computer room air conditioning, and grounding;
1) Power Supply:
The power supply of the computer room should meet: AC198~242V (220V±10%), 50Hz (±2Hz);
The computer room is powered by TN-S.
UPS power supply should be provided as much as possible.
2) Environmental requirements
Temperature satisfies 10~30°C
Relative humidity satisfies 20~80%
4) The network plan has been approved by the construction unit. Including: network topology, equipment installation location has been determined, point table and equipment of the integrated wiring system have been determined;
2. Construction process
1) Construction process
2) Main construction methods
(1) For this integrated wiring system project, it mainly includes the following construction methods:
(2) The preparation work before the construction of the integrated wiring system, from the user's research needs and optimization and deepening the design, to determine the final overall construction content.
(3) The supply of equipment and materials of the system, transportation, packaging, warehousing and other preparatory work, following the improvement of the deepening design, according to the construction schedule of each system to ensure the normal and orderly progress of the construction.
(4) The wire pipe of the system should be straight when laying, and should not be twisted and circled, and should not be damaged by external forces, and the bending radius of the cable laying should not be less than 10 times the diameter of the cable. When the fiber optic cable and twisted pair are laid in the same trunking, the fiber optic cable should be placed at the bottom. When laying in a vertical trunking, it should be tied every 60cm.
(5) There should be a unified terminal printing number at both ends of the system cable, and the handwriting should be clear and firm.
(6) The cable should leave enough wiring margin (usually not less than 50cm) at the terminal port, and put it in the embedded box to prevent damage. The wiring margin at the wiring cabinet should be left sufficient according to the supplier's opinion (generally 5cm).
(7) When the cable is laid, from the distribution frame to the terminal outlet, the middle of the cable shall not be cut and connected. When the supplier confirms that it needs to be connected, it should have special technical measures to ensure it, and the optical cable should be monitored by an optical co-rate meter or other instruments to minimize the splicing loss, and it should be installed in the sheath or splice box of the optical cable connector after splicing.
(8) Before laying the optical cable, the optical time domain reflection pin and the optical cable attenuation tester should be used to check whether the optical fiber has a folding point and whether the attenuation value meets the design requirements.
(9) When the cable is laid, the traction force should be appropriate to prevent the cable from being broken, and when encountering greater resistance, the cause should be found out first, and the fault should be eliminated before laying. Especially when laying optical cables, the traction end of the optical fiber should be technically treated, the traction force should be applied to the strong core, and the technical measures such as the maximum traction force, the traction speed and the straight line length of a traction must comply with the regulations of the manufacturer.
(10) When the optical cable is laid through the pipe, the optical cable without joints should be manually pulled into the holes one by one when laying on the straight road, and the optical cables with joints should be made in advance, and the joint part shall not pass through the pipeline.
(11) The bending radius of the optical cable laying is not less than 20 times the diameter of the optical cable.
(12) when the information socket and the power socket are installed next to each other, the two are 200mm apart, and the bottom margin is 300mm away from the floor elevation, and is buried; when the information socket is installed in the metal cassette, the cassette is horizontal (or slightly lower than this surface) with the outer surface of the wall.
(13) The information socket should have obvious signs, and colors, graphics and text symbols can be used to indicate the type of connected terminal equipment, so as to distinguish them when using them and not to be confused.
(14) The model, specification and quantity of connection hardware such as splice module (wiring module) must be used with the equipment. The connection hardware is correctly installed, numbered, and complete, and the cable connection building is clearly demarcated, and the signs should be complete, correct and complete, so as to maintain and manage.
(15) Each horizontal line starts from the wiring room, along the wiring duct of this floor or through the metal pipe of the ceiling and the metal pipe buried in the wall, arrives at the information socket cassette and connects the information socket.
(16) The installation of the horizontal line is completed before the installation of the ceiling. The management room should be set up in the center of the floor as much as possible, and a 220V single-phase power socket should be provided;
(17) The equipment room should be as close as possible to the cable entry area and network interface of the building;
(18) The clearance in front of the rack or cabinet should not be less than 800mm, and the clearance in the back should not be less than 600mm;
(19) The height of the bottom of the wall-mounted wiring equipment from the ground should not be less than 300mm;
(20) No less than two 220V, 10A single-phase power sockets with protective grounding shall be provided between the equipment;
(21) The area of the management room is generally not less than 5 square meters, and the area of the equipment room is generally not less than 10 square meters;
(22) There should be a good ventilation and dry environment in the management room and equipment room, and special attention should be paid to heat dissipation.
3. Equipment installation
(1) Equipment inspection before installation
Inspection of network cables, optical fibers, patch panels, database software and other system equipment of the wiring system.
1) Whether the brand, model, specification, origin and quantity of the equipment are consistent with the contract;
2) Visual inspection of the equipment: the packaging is intact, the casing and paint layer should be free of damage and deformation;
3) The attachments are complete, and the random data is complete, including software data, such as the media and data of the operating system and other software;
4) The power supply requirements required by the equipment are consistent with the power supply.
(2) Equipment installation
1) Generally installed in a standard 19" cabinet, or installed independently;
2) Check the power supply voltage of the cabinet or installation point;
3) When installing in a standard cabinet, the chassis should be tightened and the cabinet should be well grounded;
4) When installing independently, the equipment should be installed horizontally, and ensure that the chassis is well grounded and leave enough maintenance space;
5) Connect to the mains power supply.
4. Performance indicators and test methods
The test of the integrated wiring system basically includes two parts, one is the field test of the UTP system, and the other is the field test of the optical fiber system. Characterizing a cabling system as a single entity can provide useful data for the design of future application equipment. Field testing verifies the transmission performance of the outgoing cable factory, allowing the contractor to put the technically appropriate cabling system in the hands of the network equipment integrator. This will also improve the overall effectiveness of the building network solution and make users more satisfied.
After the wiring is completed, we will be fully responsible for the testing of the entire integrated wiring system. All testing work is carried out by engineers certified by the manufacturer of the product. Instruments that meet the corresponding accuracy requirements are used for testing.
Ø The instruments, tools and materials required for the test work are all responsible for us.
Ø All cables provided by us are inspected by the supervising engineer according to the requirements of GB/T 50312-2016 when entering the construction site, and if it is found that the cables do not meet the relevant standards or do not conform to the factory test report, we must replace them unconditionally.
Ø We test each optical cable before laying the optical cable and submit the test report.
Ø 20 days before the start of the test work of the integrated wiring system, we submit the test plan and plan of the integrated wiring system, detailing the test content, test methods, test instruments and meters, which shall be reviewed and approved by the owner and the supervising engineer.
Ø We undertake the recording of all tests and submit 4 test reports to the owner in the form of written and electronic documents respectively.
Ø We repair the faults and defects found in the test, and bear the costs incurred in repairing the faults and defects.
(1) Category 6 line test standards
Conducted in accordance with international standards for Category VI/ClassE cabling systems. The acceptance of this project will test the performance of the channel, and the test model is shown in the following figure:
Thereinto:
1) A, E ----- 2m test cable or 2m jumper
2)B、D-----2nd 跳线
3) C -------- 90m horizontal cable
The channel test includes:
connectivity
端接线序(WireMap)
length
DC resistance
Characteristic impedance
衰减(Mitigation)
近端串扰衰减(NEXTloss)
Power Sum Near-End Crosstalk Attenuation (PS-NEXTloss)
Attenuated Crosstalk Ratio (ACR)
Power Sum Attenuation Crosstalk Ratio (PS-ACR)
等效电平远端串扰衰减(ELFEXTloss)
功率总和等效远端串扰衰减(PS-ELFEXTloss)
回波损耗(ReturnLoss)
Delay
DelaySkew
According to the provisions of the channel of the lifelong quality assurance policy of the integrated wiring system, the cable indicators are guaranteed to be met.
The cabling system data link delay and delay skew tests are higher than the following indicators:
| Frequency (MHz) | Cable Propagation Delay | Connector Propagation Delay | Channel Propagation Delay | Permanent Link Propagation Delay |
| 1 | 570ns | 2.5ns | 580ns | 521ns |
| 4 | 552ns | 562ns | 504ns | |
| 8 | 547ns | 557ns | 499ns | |
| 10 | 545ns | 555ns | 498ns | |
| 16 | 543ns | 553ns | 496ns | |
| 20 | 542ns | 552ns | 495ns | |
| 25 | 541ns | 551ns | 494ns | |
| 31.25 | 540ns | 550ns | 494ns | |
| 62.5 | 539ns | 549ns | 493ns | |
| 100 | 538ns | 548ns | 492ns | |
| 125 | 537ns | 547ns | 490ns | |
| 200 | 537ns | 547ns | 490ns | |
| 250 | 537ns | 547ns | 490ns | |
| Frequency (MHz) | Cable Delay Skew | Connector Delay Skew | Channel Delay Skew | Permanent Link Delay Skew |
| 1-250MHz | 45ns | 0.5ns | 47ns | 44ns |
Our company conducts 100% testing of the wiring system of the intelligent system engineering, and the test of the wiring system of the system engineering is carried out in accordance with the methods agreed in the tender or contract.
Field testing steps
Uniform testing operations, proper training, which are important when testing in the field. Although the owner of each cabling system will have different requirements, it can be dangerous if each cabling system is tested in a different way. Because these instruments are much more complex than those that test connectivity, incorrect settings or improper battery use can waste a lot of testing time. Appropriate standard procedures and cycles must be specified. Here are the steps you need to do about field testing:
Ø Check the status of the instrument
Ø Selection of interface adapter for testing
Ø Field test of wiring system
Ø According to the test results, determine the cause of the fault and eliminate the fault
ØSave and back up the test results
Ø Analysis, storage and printing of test results
o Analysis of test results
There are two possible scenarios for the parameters of a single test result: FAIL or PASS. If the test result of any single parameter is PASS, it will be considered that the index of this parameter is qualified, if all other parameters are also PASS, the entire test result will be PASS; the test result of any single parameter is FAIL, which will lead to the FAILURE of the entire test result, at this time, the cause of the fault should be found according to the test results, and the test should be re-tested after correcting the error.
Fluke table test report analysis
1. Insertion loss: Insertion loss refers to the loss of load power that occurs due to the insertion of a component or device somewhere in the transmission system, which is expressed as the ratio of the power received on the load before the insertion of the component or device to the power received on the same load after insertion in decibels.
The larger the insertion loss margin, the better (i.e., the smaller the insertion loss). As shown in the figure, the greater the distance between the test result and the limit value, the better. When the threshold is approached, the FLUKE test instrument correspondence is displayed!
(1) Insertion loss refers to the signal loss generated by inserting cables or components between the transmitter and the receiver, usually referring to attenuation. Insertion loss is expressed in the corresponding decibel (dB) of the received signal level.
A circuit that measures insertion loss
(2) Insertion loss mostly refers to the loss of power, and attenuation refers to the decrease in the amplitude of the signal voltage relative to the amplitude of the original signal. For example, for an ideal lossless transformer, the primary and secondary ideal transformers are lossless, that is, the insertion loss is zero. The concept of insertion loss is generally used in a filter to indicate the loss of signal power before the filter is used and when it is not used.
Insertion loss curve of a transmission line transformer
The insertion loss of a channel is the ratio of the output optical power of the output port to the input optical power of the input port, measured in dB. Insertion loss is related to the input wavelength and is also related to the switching state. Defined as: IL=-10log(Po/Pi)
During the ceremony:
Pi—→ the optical power input to the input port, in mw;
Po—→ the optical power received from the output port, in mw.
For OLP, it is divided into sender insertion loss and receiver insertion loss.
2. Near-end crosstalk (NEXT) is the most important criterion for evaluating performance. A high-speed LAN is synchronous when transmitting and receiving data. The unit of NEXT is dB, which represents the ratio between the transmitted signal and the crosstalk signal. So, the higher the value of near-end crosstalk, the better. As shown in the figure, the greater the distance between the test result and the limit value, the better. When the threshold is approached, the FLUKE test instrument correspondence is displayed!
3. Comprehensive near-end crosstalk (PSNEXT) is calculated by a formula based on the NEXT influence of each pair of lines from the other three pairs of lines alone. In the same way, the higher the value, the better. As shown in the figure, the greater the distance between the test result and the limit value, the better. When the threshold is approached, the FLUKE test instrument correspondence is displayed!
4. The attenuation crosstalk ratio (ACR) is actually the difference between the attenuated signal from the far end and the crosstalk noise, so the larger the difference, the better. As shown in the figure, the greater the distance between the test result and the limit value, the better. When the threshold is approached, the FLUKE test instrument correspondence is displayed!
5. Return Loss (RL) Return loss, also known as reflection loss. It is the reflection caused by the impedance mismatch of the cable link, and it is the reflection of the pair of wires themselves. Mismatches occur mainly where connectors occur, but they can also occur where the characteristic impedance changes in the cable, so the quality of construction is the key to improving return loss. The return loss will introduce fluctuations in the signal, and the returned signal will be confused by the duplex gigabit network mistaking it for the received signal. The greater the return loss, the better. As shown in the figure, the greater the distance between the test result and the limit value, the better. When the threshold is approached, the FLUKE test instrument correspondence is displayed!
6. The difference and connection between the worst margin and the worst value in the test
In the acceptance procedure of the integrated cabling system, the test report has a very important weight, it marks the quality of the final quality of the integrated cabling system, and the value of near-end crosstalk (NEXT: near-end crosstalk refers to the signal coupling of one pair of wires to another pair of wires in a link) is an important parameter in the test report.
Each pair has a different NEXT value at each frequency, with the lowest NEXT value being the worst. It is generally the higher frequency position, because the crosstalk signal increases with the frequency, resulting in a decrease in the NEXT value, so the worst value is usually at the higher frequency position.
IEEE in the development of the standard based on theory and practice on the basis of theory and practice proposed at each frequency point NEXT minimum value, once lower than this value, it means that the receiving end can not distinguish the useful signal from the interference signal, although in the worst value, the NEXT value is the smallest, but when the signal is transmitted at this frequency, as long as the NEXT value is higher than the limit value, the receiving end can still correctly accept the signal when the signal is interfered, so at the worst value, the transmission quality of the signal is not necessarily the worst. The difference between the NEXT value and the limit value is more representative of the signal transmission quality, the smallest difference is the worst margin, and the worst margin is the lowest margin among the test results of all test frequency points.
7. Data analysis of FLUKE test results
The worst pair is the worst, which is the two pairs of lines with the lowest near-end crosstalk at a certain frequency. When the distance between NEXT and the limit value (33.2) is smallest, i.e., the frequency is 88.3, the corresponding pair is 36-78. The worst value is the smallest value of NEXT, which is 12-36 12-45 12-78 36-45 36-78 45-78 at one end of the NEXT value. The worst margin is the minimum difference between the limit value and the NEXT value.
Handling of failures
For a less reliable link, you should stop testing and figure out what is causing the cabling failure. It is also important to note that the results of this test may be due to problems with wiring, test instrument setup, or termination.
Printing of test results
The next step after the test is usually to print a record, and all test results can be printed and signed by both the installer and the user.
For a large amount of data that needs to be analyzed and organized, a better approach is to store all the data in a computer for analysis. All test instruments provide some way to transfer data from the instrument to a computer while freeing up storage space in the field tester to record new test data.
Some troubleshooting about field testing
| Questions | Resolution |
| The tester does not work or cannot be calibrated remotely | Charge or replace the battery |
| The tester is set to the incorrect cable type | Make sure both testers are turned on and have enough batteries; Replace the battery |
| The tester is set to an incorrect link type | Re-set the tester parameters such as correct class, impedance, and NVP |
| Link/channel自动测试"Fails" | Areas where the detection failed |
| a) The circuit map did not pass | Check whether the tester is set to the same T568A/B as the actual socket Inspect the joints at both ends for open wires, cracks, or staggering |
| b) The length did not pass | Confirm and recalibrate the NVP with a known good line Check the total length of the device cable and jumper cable |
| c) The attenuation did not pass | Check whether all cables in the link are Category 5 enhanced |
| d) NEXT or ELFEXT is not passed | Check that all connectors are Enhanced Category 5 Check the quality of all wire-to-end connections |
| The tester cannot perform automated testing | Check the settings on the control keys and menus Check that the tester is not calibrated Check the tester fittings at both ends |
| The tester cannot store automated test results | Confirm that the selected test result name is unique Check the amount of free memory available |
| The tester cannot print stored automated test results | Confirm that the interface parameters of the printer and tester are set to the same, and confirm that the test result has been selected as printout |
(2) Testing of optical fiber systems
The testing of fiber optic systems typically includes three basic forms of fiber optic network links: horizontal subsystems, backbone subsystems, and hybrid methods. The horizontal subsystem mode is generally from the information outlet to the network segment between the optical fiber distribution frame (IDF) on the floor, or the network segment at the optical fiber distribution frame (IDF) for the multimedia information outlet in the office; the backbone subsystem mode is mainly the connection network between the backbone distribution frame (MDF) and the distribution frame (IDF), and the point-to-point direct connection mode integrates the backbone subsystem and the horizontal subsystem. The following parameters need to be tested for different link forms:
Ø Parameters to be tested for the optical fiber horizontal subsystem:
Test full attenuation value at wavelengths of 850 nm or 1300 nm in one direction;
Ø Parameters to be tested for the optical fiber horizontal subsystem and hybrid mode:
²Test the full attenuation value at wavelength 850 nm or 1300 nm in one direction;
²It is recommended that the following and the actual measured values should be recorded accordingly in the actual test.
² Name of the test team member;
² The model of the test instrument (manufacturer, model, product serial number);
² Date of test;
² The wavelength of the light source, the width of the spectrum and the coupled optical power ratio;
² Optical fiber and cable models, manufacturers;
² The name of the terminal (terminal) location;
²Test direction;
² Related power test;
²The optical loss value of the network segment obtained after the test;
²The magnitude of the passing value (calculated theoretically);
Ø Test steps and process
Ø Calibration of test instruments and their connecting jumpers
Ø Clean the connectors and coupling connectors at both ends of the optical fiber jumper first;
Ø Execute the test instrument command and enter the state of ready test calibration;
Ø Use optical fiber jumper to connect the light source and the optical power meter;
Ø Select the "relevant power test file" of the optical power meter, if the power meter does not have this file, it is not needed, and then record the power value of the relevant test Pref.
Ø Remove one end of the test jumper from the optical power meter, but do not remove the other end from the light source.
Ø Connect the optical fiber jumper and optocoupler to the jumper, and then connect the optical power meter at the other end (as shown in the figure).
Ø Record the data of the optical power meter test. If the power meter is in the relevant "Power Attenuation Test" file and its value is in dB, the value shown on the table is the attenuation value of the jumper.
Ø Change the position of the two jumpers and test them in the same way to confirm that the attenuation value of the two optical jumpers meets the requirements.
| Test the jumper nominal | ||
| SC or ST jumper | LC jumper | |
| Multimode | 0.50dB (maximum) | 0.20dB (max) |
| Single | 0.55dB (maximum) | 0.30dB (max) |
The integrated cabling system ensures that the fiber optic link is above the following indicators:
1. The maximum attenuation value per kilometer of different types of optical cables at nominal wavelengths should comply with the provisions of the following table.
| Maximum cable attenuation (dB/km) | ||||
| project | OM1,OM2 OM3多 | OS1 single-mode | ||
| wavelength | 850nm | 1300nm | 1310nm | 1550nm |
| attenuation | 3.5 | 1.5 | 1 | 1 |
2. The maximum optical attenuation (intervention loss) measured by the optical cable cabling channel in the specified transmission window shall not exceed the provisions of the following table, which includes the attenuation of the connector and the connected socket.
| level | Maximum Channel Attenuation (dB) | |||
| Single | Multimode | |||
| 1310nm | 1550nm | 850nm | 1300nm | |
| OF-300 | 1.80 | 1.80 | 2.55 | 1.95 |
| OF-500 | 2.00 | 2.00 | 3.25 | 2.25 |
| OF-2000 | 3.5 | 3.5 | 8.50 | 4.50 |
3. The insertion loss limit value of an optical fiber link can be calculated by the following formula:
| class | Operating wavelength (nm) | Attenuation coefficient (dB/km) |
| Multimode fiber | 850 | 3.5 |
| Multimode fiber | 1300 | 1.5 |
| Single-mode outdoor fiber | 1310 | 0.5 |
| Single-mode outdoor fiber | 1550 | 0.5 |
| Single-mode indoor fiber | 1310 | 1 |
| Single-mode indoor fiber | 1550 | 1 |
| Connection device attenuation | 0.75dB | |
| Fiber connection point attenuation | 0.3dB |
Testing of the entire fiber link
1. Normal curve
Generally, it is a normal curve, A is the blind area, and B is the reflection peak at the end of the test. The test curve is sloped, and the total loss increases as the distance increases. Divide the total loss (dB) by the total distance (km) to get the average loss (dB/km) of the core.
2. There are jumper points in the optical fiber
There is an extra reflection peak in the middle, because there is a high probability that there is a jump point in the middle. Of course, there are exceptions, and in general, reflection peaks can occur, many of which are due to the flat and smooth end face of the fiber at the end. The flatter the end face, the higher the reflection peak. For example, in an interrupted cutover, when the optical cable is cut, the test curve should be as shown in the optical path breakpoint diagram, but when you test again, if there is a reflection peak at the original breakpoint position, it means that the on-site construction personnel are likely to have done a good job of the end face of the fiber core.
3. Abnormal circumstances
In this case, it may be that the pigtail of the meter is not plugged in properly, or the light pulse cannot be hit at all, and then the breakpoint position is relatively advanced, and the distance and pulse settings used are relatively large, and it looks like the light is not out. In this case, 1. Check the pigtail connection, 2. Change the settings of the OTDR to adjust the distance and pulse to the minimum, if this is still the case, you can judge that 1. There is a problem with the pigtail, 2. There is a problem with the matchmaker on the OTDR, 3. The breakpoint is very close, and the OTDR is not enough to test the distance. If it is a pigtail problem, you only need to change a pigtail to know, if it doesn't work, you have to try to scrub the matchmaker, or check the fiber core nearby.
4, Non-reflective incident
This situation is more common, there is an obvious step in the middle of the curve, most of which are due to factors such as the core being discounted, the bending is too small, and the external damage is affected. This step in the curve is a relatively large loss point, can also be called the event point, the curve falls down at the point, called the non-reflection event, if the curve is upturned at the point, it is the reflection event, at this time, the loss point of the point becomes a negative value, but it is not that his loss is small, this is a pseudo-gain phenomenon, the reason for this phenomenon is that the backscattering coefficient of the optical fiber on both sides of the joint is not the same, the backscattering coefficient of the optical fiber after the joint is greater than the backscattering coefficient of the fiber in the front section, and the situation is just the opposite from the other end, and the refractive index is different and may also produce a gain phenomenon。 So to avoid this, just use the two-way test method.
5. There is a break point in the optical fiber
If you know the original distance of the core, the curve will fall before reaching the original distance of the core, which means that the optical fiber is broken at the place where the curve fell, or it is possible that the optical fiber is discounted there. We often use this reason to discount the fiber core that cannot be determined when troubleshooting on the line, and then the tester uses the OTDR to monitor the time and judge the fiber core according to the situation in the figure.
6. The test distance is too long
This occurs when testing a long-distance core at a distance that the OTDR cannot reach, or when the distance or pulse setting is too small. If this happens, and the distance and pulse of the OTDR are relatively small, it is necessary to increase the distance and pulse to achieve the purpose of full-section testing, and it is also a way to slightly extend the test time.
5. Testing and acceptance
The integrated wiring system accepts the following according to the wiring standards and specifications:
Check the construction wiring, the installation of the panel, the placement of the equipment, and the sensory inspection
Pass the test criteria, the indicators are checked
Check the construction quality, quality inspection
Check safety specifications, equipment fixity, protection, safety inspection
According to the specification, the following reports and electronic documents are given:
(1) Design and construction plan
(2) Project acceptance report
(3) In addition, the following information is provided: integrated wiring system configuration, wiring information, and maintenance manual
In order to ensure the quality of the project, ensure the normal operation of the system and the smooth handover of the project, this standard is specially formulated as the basis for the completion and acceptance of the project. Include:
Product quality acceptance: Each supplier provides the quality certificate of the product to the owner, and the owner verifies and signs. Equipment installation and acceptance: It should comply with the provisions of the current national standards "Code for Construction and Acceptance of Electrical Installation Engineering" and "Code for Acceptance of Integrated Wiring System Engineering of Buildings and Building Complexes", and should meet the design requirements, and the installation of all lines, pipes and slots should be firm, neat and without damage.
6. Requirements for technical measures
1) The laying of cables shall comply with the following provisions:
The cable should be visually inspected before it is laid;
The cable should be laid naturally straight, not twisted, not crossed, and the label should be clear;
The bending radius shall be in accordance with the provisions of the following table;
There should be a margin at the wiring of the cable, and the length of the margin should comply with the provisions of the following table;
The equipment jumper should be plugged in, and a special jumper should be used;
There shall be no connector in the cable from the patch panel to the equipment;
A conduction test should be carried out after the cable is laid.
2) The bending radius of the cable rack, trunking and guarding
The bending radius of the cable rack, trunking and protective pipe shall not be less than the minimum allowable bending radius of the cable, and the laying shall comply with the relevant provisions of the current national standard "Code for Acceptance of Construction Quality of Building Electrical Engineering" GB 50303-2015. For the upper wiring mode, the laying of the wiring frame should not only comply with the relevant provisions and design requirements of the current national standard "Code for Construction Quality Acceptance of Building Electrical Engineering" GB 50303-2015, but also meet the following provisions:
When laying optical cables in the wiring frame, special channels should be set up with flame-retardant plastic for pigtails, and the corners of the pigtail channels should be smooth and arc-shaped;
The pigtail part of the optical cable should be tied with cotton thread;
3) The cable rack hanger should be vertical, neat and firm.
4) Cable lashing
When running cables in horizontal and vertical trays and vertical trunking, the cables should be tied. Twisted pair cables, optical cables and other signal cables should be bundled according to the type, quantity, diameter and number of cable cores. The spacing should not be greater than 1.5m, the spacing should be even, and the tightness should be moderate. Vertically routed cables should be secured every 1.5m on the cable support.
5) The installation of wiring cabinets and racks should meet the design requirements, and should be firm and reliable, and the color code should be used to indicate the purpose.
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