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Difference between revisions of "Troubleshoot/Cable Distance Limitations and Solutions"
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====Midspans==== | ====Midspans==== | ||
[[file:PFT1200.jpg|right|thumb|PFT1200 Midspan]] | [[file:PFT1200.jpg|right|thumb|PFT1200 Midspan]] | ||
− | + | The way a midspan works is that whenever a device is connected to it, a small amount of power is transferred along the cable; not enough to power the device, but enough to power the port. The midspan will then send a short signal over the network to ask the device if it needs power. A Power over Ethernet enabled device will return a message saying that it does require power which the midspan will then supply. A device which does not support Power over Ethernet will not reply and thus will not receive any additional power. This means that you can never damage a device that does not support Power over Ethernet by plugging it into a midspan. -[http://www.networkwebcams.com/ http://www.networkwebcams.com/ip-camera-learning-center/2008/09/30/glossary-term-power-over-ethernet-midspan/] | |
====Switch==== | ====Switch==== | ||
[[file:PFS3110-8T.jpg|right|thumb|PFS3110-8T Switch]] | [[file:PFS3110-8T.jpg|right|thumb|PFS3110-8T Switch]] | ||
+ | A network switch (also called switching hub, bridging hub, officially MAC bridge[1]) is a computer networking device that connects devices together on a computer network, by using packet switching to receive, process and forward data to the destination device. Unlike less advanced network hubs, a network switch forwards data only to one or multiple devices that need to receive it, rather than broadcasting the same data out of each of its ports. -Wikipedia | ||
====Wireless-Short Range==== | ====Wireless-Short Range==== | ||
====Wireless-Long Range==== | ====Wireless-Long Range==== |
Revision as of 16:37, 19 July 2016
Contents
Cable Distance Limitations and Solutions
Description
When scoping out a potential location to install a security system, there are often challenges with cable distances. Longer cable runs can be especially challenging if you don't know how to work around these issues. Below are several solutions for HD-CVI and IP bases systems that need cable runs longer than the standard cable distance limitation.
HD-CVI Cable Limitations
- HD-CVI RG59 1650ft
- HD-CVI 75-5 2145ft
1280H(1280×720): 500m via Φ75-3, 650m via Φ75-5
1920H(1920×1080): 300m via Φ75-3, 400m via Φ75-5
HD-CVI Solutions
Baluns
A balun /ˈbælʌn/ is an electrical device that converts between a balanced signal (two signals working against each other where ground is irrelevant) and an unbalanced signal (a single signal working against ground or pseudo-ground). A balun can take many forms and may include devices that also transform impedances but need not do so. Transformer baluns can also be used to connect lines of differing impedance. Sometimes, in the case of transformer baluns, they use magnetic coupling but need not do so. Common-mode chokes are also used as baluns and work by eliminating, rather than ignoring, common mode signals. -Wikipedia
IP Cable Limitations
- CAT5e/CAT6 = 300ft
IP Solutions
Midspans
The way a midspan works is that whenever a device is connected to it, a small amount of power is transferred along the cable; not enough to power the device, but enough to power the port. The midspan will then send a short signal over the network to ask the device if it needs power. A Power over Ethernet enabled device will return a message saying that it does require power which the midspan will then supply. A device which does not support Power over Ethernet will not reply and thus will not receive any additional power. This means that you can never damage a device that does not support Power over Ethernet by plugging it into a midspan. -http://www.networkwebcams.com/ip-camera-learning-center/2008/09/30/glossary-term-power-over-ethernet-midspan/
Switch
A network switch (also called switching hub, bridging hub, officially MAC bridge[1]) is a computer networking device that connects devices together on a computer network, by using packet switching to receive, process and forward data to the destination device. Unlike less advanced network hubs, a network switch forwards data only to one or multiple devices that need to receive it, rather than broadcasting the same data out of each of its ports. -Wikipedia