Remotely accessing video recorders and cameras on the internet (WAN) is an important feature to most clients and it should be considered when installing and implementing a video surveillance system. Discussed on this page are three critical aspects of networking a video recorder or camera system:
Page 1 - Port forwarding video recorder(s) and camera(s)
Page 2 - Multiple Router Port Forwarding
Page 3 - Managing an network IP camera system
Page 4 - Bandwidth and throughput limitations
Download the Networking guide in .PDF form here.
When setting up a security camera system, the most frequent bottleneck to viewing performance is low bandwidth both on the LAN and WAN. This is especially true when working with network IP cameras. Low bandwidth can cause live video streams to appear staggered or laggy, jumping between frames and missing seconds of footage. Here are some steps you can take to improve or troubleshoot bandwidth related issues:
Lowering main stream encode settings over all cameras can improve recordings if lag is experienced, however this can adversely affect image quality in both live streams and recorded footage. It is also suggested to change the bitrate to CBR (constant bitrate) if there is lag on recorded footage.
All DH Vision video recorder units have 10/100/1000M (gigabit) uplink ports, however our network IP cameras do not. This means that when using multiple (8+) network cameras, it is suggested to use gigabit networking devices (switches and routers) when viewing them through a network video recorder. Using quality networking devices can drastically improve LAN performance.
Many times it is preferred to use a separate dedicated router for the camera system which can improve network load balancing and throughput management.
Using Cat6 cabling may improve throughput, albeit minimally. Also gigabit network devices (switches and routers) will be necessary to see any improvement from using higher quality network cabling.
When viewing remotely either through the Web Service, PSS or DMSS it is advised to use the extra stream. Extra stream is set to a low encode settings (resolution and bitrate) specifically for viewing remotely. Be aware, that extra stream does not have as good video quality as main stream, so if higher quality is required for remote live viewing then lowering main stream encode settings may be required.
Generally, bandwidth and throughput is highly dependent on the internet service package the client is receives from their ISP. An improvement to remote viewing is made by increasing upload speeds, which means upgrading the whole package. DH Vision suggests at least 2MB upload speed per network camera, or around 25MB for a large camera system.
Here is a quick list of other factors that need to considered when networking a security camera system:
Specifications may require not recording at the location of the cameras. Remote recording can be accomplished with DH Vision video recorders. DH Vision suggests placing a video recorder at both the recording and the camera location to ensure network stability. To add the cameras remotely from the camera location's video recorder, it is as simple as using the external IP address and TCP port of the remote locations recorder and add it to the recording network video recorder as a remote device using the correct remote channel. For more information refer to this article.
Certain DH Vision cameras are wireless (Wi-Fi) capable. Wi-Fi capability can be enabled by logging into the camera via the Web Service and setting up connectivity with the appropriate Wi-Fi routing device. For more information on Wi-Fi setup, refer to this article.
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