by Tim Troxel IP and offers very few benefits over analog and in most cases is more expensive and offer lower performance compared to analog cameras and DVR's. 5 myths regarding IP VS Analog Reduce wiring *IP does not reduce wiring compared to analog even when using POE as analog with the use of baluns can transmit both video and power over cat 5 making them just as affective as POE . Some baluns even achieve distance up to 2km for transmission and unlike IP do not require specific equipment such as POE routers and cameras. Network Transmission * A good DVR like Ascendents H.264 X4S standalone DVR converts analog cameras into IP addressable cameras and can record at one resolution, stream at another to and from multiple sites simultaneously. It has integrated VBR and CBR to totally manage the amount of data and bandwidth that is used by each camera individually giving analog cameras the same features as IP cameras. Simply put a good DVR acts as an IP server since only it has the ability to work autonomous of a network and be part of a larger homogeneous solution. High Definition * Yes High definition mega pixel cameras do offer some advantages but are extremely limited in their applications. Mega pixels cameras are limited because of their poor price to performance ratio, large file size, low signal to noise ratio, motion blur, and most are based on CMOS. CMOS cameras have inferior ability then CCD to cope with ambient lighting such as back light, bright, deep shadows contrasts, low light and IR this is also known as the real world. HDD CCTV (SDI) can now send HD video over coax Technology s * Analog has come a long way and now offers almost the exact same set of features as IP in that when paired with a good DVR to allow video to be transmitted over networks and record to and from multiple sites over LAN and WAN simultaneously with virtually endless expandability in modules of 4,8,16,32 and 64.The most recent advantage in IP cameras is using CCD imagers instead of CMOS because of there performance but since 3CCD are often needed to replace one CMOS it is very expensive and rarely used which is why most IP cameras are CMOS and offer poorer performance then there analog counterparts except for large wireless projects and those that have fiber optic cabling. (you can now send up to 64 analog camera over fiber optic) Standard ONIVF PSIA * Analog is more standard then IP and any analog camera can work on any DVR. There are NO STANDARDS FOR IP, at the moment. PSIA (Physical Security Interoperability Alliance) and ONIVF (Open Network Video Interface Forum) are not standards just because you have a NVR and a IP camera that sue ONIVF or PSIA does not mean they will work with each other any more then any H,264 camera can work with any H.264 IP camera. Every IP manufacturer and sometimes every IP model has to be added individually before it will work with a NVR platform, so ONIVF and PSIA are nothing more then marketing ploys and since there is no standard for IP it's a messy maze of corporate alliances, licensing fees and a mix of match of software writers and hardware manufactures. (much like getting programs to work with windows vista) Big companies love IP as once you buy their system you are trapped into using there platform or risk losing your initial investment. Now in a few years I do expect there to be some open standards but they simply don't exist right now, making analog or hybrid system all the more appealing. Security One thing that is often not mentioned when comparing analog and IP even though often cameras main purpose is security.The major flaws with IP is that it is completely dependent on a network for it to operate, if the network goes down so does your security. SD cards do not provide sufficient backup and networks have a number of failures points such as hubs, switches. A good system should be able to take full advantage of networks but never depend upon them.by Tim Troxel |
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