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actefft
I would prefer the cameras to be wireless and to have a DVR. It would be nice if there was an app I could access the system from my phone. I would probably need at least 12 cameras.
Answer
I like Swann and Lorex systems for these (or smaller) systems.
There may be valu in getting two systems so if one fails, all the cameras are not down - but that is up to you.
Since we do not know the office layout, we do not know how the "wireless" part will work going through walls made of various materials.
Quick review:
Wired security cameras have a single "bundled" cable that contains the video feed and power. There are two plugs at the camera - one for power and one for video. At the DVR there is a connection for the video and the power plug connects to a power source - usually a "wall wart" or some sort. You can locate a battery back-up system at the DVR to power the DVR and the camera in the event of a power outage.
Wireless security cameras send only the video wirelessly. The camera still needs power (wire #1). If battery backup is needed, then some sort of local UPS is needed. The video is transmitted wirelessly to its base station mate. The base station needs power (wire #2). The base station connects with wire (#3) to the DVR.
You will also want to invest in a couple of monitors that connect to the DVR. 16 channels is a lot to watch. For the monitor at the DVR, a low priced, VGA-connected computer monitor is fine. There may be a need to have auxilliary monitors around the rest of the property. Use of the composite video out makes that easy.
Connecting the DVR to the computer network is easy enough - be sure the network is segmented using a network switch (not just a hub) so the video traffic and be isolated from the rest of the network. Use of PnP is easy, but a network admin with half a clue will know how to set the IP address and security properly. Also, for the remote access you want, setting up the router to allow your access while maintaining network security is needed. Again, any half skilled network admin who understands IP networks and router configuration can do this. This works best if your internet provider gives you a static IP address, but can still work if a dynamic address is used - there are some work-arounds and compromises you'll make is you go this route.
I would suggest sizing the system with more ports for cameras than you think you need - in case you decide to add cameras. In this case, two 8-channel systems gives you decent coverage. And a composite security camera will work on any manufacturer's system. I have installed Swann DVRs with Swann, Lorex and other manufacturer's analog, composite video, security cameras...
You did not tell us if the cameras will all be indoors or if there will be any out door (parking lot, alley, etc) in which case you may want outdoor-rated night-vision cameras in addition to the indoor versions.
I like Swann and Lorex systems for these (or smaller) systems.
There may be valu in getting two systems so if one fails, all the cameras are not down - but that is up to you.
Since we do not know the office layout, we do not know how the "wireless" part will work going through walls made of various materials.
Quick review:
Wired security cameras have a single "bundled" cable that contains the video feed and power. There are two plugs at the camera - one for power and one for video. At the DVR there is a connection for the video and the power plug connects to a power source - usually a "wall wart" or some sort. You can locate a battery back-up system at the DVR to power the DVR and the camera in the event of a power outage.
Wireless security cameras send only the video wirelessly. The camera still needs power (wire #1). If battery backup is needed, then some sort of local UPS is needed. The video is transmitted wirelessly to its base station mate. The base station needs power (wire #2). The base station connects with wire (#3) to the DVR.
You will also want to invest in a couple of monitors that connect to the DVR. 16 channels is a lot to watch. For the monitor at the DVR, a low priced, VGA-connected computer monitor is fine. There may be a need to have auxilliary monitors around the rest of the property. Use of the composite video out makes that easy.
Connecting the DVR to the computer network is easy enough - be sure the network is segmented using a network switch (not just a hub) so the video traffic and be isolated from the rest of the network. Use of PnP is easy, but a network admin with half a clue will know how to set the IP address and security properly. Also, for the remote access you want, setting up the router to allow your access while maintaining network security is needed. Again, any half skilled network admin who understands IP networks and router configuration can do this. This works best if your internet provider gives you a static IP address, but can still work if a dynamic address is used - there are some work-arounds and compromises you'll make is you go this route.
I would suggest sizing the system with more ports for cameras than you think you need - in case you decide to add cameras. In this case, two 8-channel systems gives you decent coverage. And a composite security camera will work on any manufacturer's system. I have installed Swann DVRs with Swann, Lorex and other manufacturer's analog, composite video, security cameras...
You did not tell us if the cameras will all be indoors or if there will be any out door (parking lot, alley, etc) in which case you may want outdoor-rated night-vision cameras in addition to the indoor versions.
security camera tampering?
destun.200
I work at our local school district which is equipped with security cameras. Recently, a theft occurred which may have involved a supervisor/night time security. When the employee asked for cameras to be checked, the supervisor claimed she "did not see anyone" going into a locked closet where the employees keys were taken out of. Also, when asked to view the footage along with the supervisor, the supervisor said, "No.You don't need to see." My question is, can frames of footage be edited out or deleted out. The security system is loaded into the supervisors computer that is equipped for real-time viewing and archive viewing.
Answer
Hi "Destun":
If it's an "inside job", someone besides the supervisor in question needs to see and review the original video files. Most CCTV systems have to be installed & maintained by licensed professionals, and have data security measures (time stamping, log files, file encryption & backup measures) to prevent tampering or to show when tampering has been attempted.
But on simple DVR-based (digital hard-drive video recorders), a skilled person could attempt to modify or delete certain scenes. As I said, attempts like that by anyone but the most-skilled data hacker would leave a "trail" on some data log or file-change log, in a well-designed system.
Someone at the School District level (District Superintendant or School Board rank) should intervene in the matter, since civil employee theft and fraud has become commonplace in many School Districts (especially at the maintenance & purchasing department levels).
If you need to, do an anonymous "whistleblower" report to the District higher-ups and/or whatever County Commissioners or overseeing tax body handles the budget money. They'll tend to get beneath the suspicious veneer of "You don't need to see...".
hope this helps,
--Dennis C.
Â
Hi "Destun":
If it's an "inside job", someone besides the supervisor in question needs to see and review the original video files. Most CCTV systems have to be installed & maintained by licensed professionals, and have data security measures (time stamping, log files, file encryption & backup measures) to prevent tampering or to show when tampering has been attempted.
But on simple DVR-based (digital hard-drive video recorders), a skilled person could attempt to modify or delete certain scenes. As I said, attempts like that by anyone but the most-skilled data hacker would leave a "trail" on some data log or file-change log, in a well-designed system.
Someone at the School District level (District Superintendant or School Board rank) should intervene in the matter, since civil employee theft and fraud has become commonplace in many School Districts (especially at the maintenance & purchasing department levels).
If you need to, do an anonymous "whistleblower" report to the District higher-ups and/or whatever County Commissioners or overseeing tax body handles the budget money. They'll tend to get beneath the suspicious veneer of "You don't need to see...".
hope this helps,
--Dennis C.
Â
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