30 TEST & MEASUREMENT
30 TEST & MEASUREMENT
• Video resolution : the resolution of the video stream , 1920 x 1080 is ‘ full HD ’. This proves the camera is filming at the resolution required by the client
• Frame rate : number of images captured per second ( fps ). Most cameras will allow up to 25-30 fps for smooth video . The frame rate can be reduced to lessen the impact on network bandwidth
• Video CODEC : the type of compression used to stream video . Common types are H . 264 and MJPG . The CODEC used affects video quality and bandwidth
• Bandwidth : the average amount of data streaming from the camera at the current video configuration settings , measured in megabits per second ( Mb / s ). Bandwidth is a function of resolution , frame rate and CODEC
• Network details : complete network configuration of the camera including gateway , DNS , subnet and other information to ensure the camera is connected to the intended network
• Camera MAC address : the unique hardware ID of the camera which is often the serial number . The MAC address cannot be changed
• Location of the camera : a description of where the camera is installed and what it is aimed at
• Screen capture : a picture of what the camera is monitoring . The screen capture is key because it shows the camera ’ s field of view and that it is properly focused . Reports should allow multiple images to demonstrate both day and night image quality
Reduce maintenance and repair time The benefits of installation documentation reach beyond closing out a project with test reports . If a camera needs to be replaced at a later time , the replacement should be configured just like the failed camera to ensure the system can be returned to normal operation as quickly as possible . If a client reports that the camera overlooking the front of the building is down a technician can be sent to the site with a camera ready to drop in place assuming the necessary information is available .
At the office , the report for the failed camera can be retrieved and used as a template for the replacement . The report contains the camera brand and model allowing the correct replacement to be pulled from inventory . While at the office , the new camera can be programmed with the network settings , location , description and video settings that were captured on the original report .
A technician can then take the pre-configured camera to the customer site , swap it out and use the field tester to create a new report . The updated report can be compared to the original to verify that the field of view and video settings are the same as the original . Time on site and labour costs for service calls can be significantly reduced when technicians and service personnel are armed with the information and tools to maximise efficiency .
More than documentation Documentation is just one function of multi-function CCTV testers . They also provide field technicians with tools to troubleshoot cable and network problems , test POE ( Power over Ethernet ), test video monitors and much more . And while IP is here to stay , the installed base of analogue cameras , as well as new HD coax systems , must also be supported . CCTV testers that support IP , analogue and HD coax cameras , plus cable & network troubleshooting minimise the equipment technicians need to carry in the field . They can also replace laptops , POE injectors and other cumbersome devices that are difficult or even dangerous to use while on a ladder or lift . n
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