TROUBLESHOOTING THE NETWORK GRAPHIC COURTESY OF THE AUTHOR
cols. If the installing technician doesn’t understand this and doesn’t set all three ports, the authorized remote viewer might be able to connect to the NVR over the Internet, but not be able to see any video.
The NUUO 2040, for example, requires three ports to be opened in the firewall; in this case, ports numbered 8010, 5150 and 5160. Each port must be opened for both UDP and TCP protocols.
Internet. Such firewalls are typically included in the cable modem or DSL adapter.
One typical problem that occurs is that often a
device will require more than one port to provide full remote access and functionality. For example the NUUO 2040 four-channel NVR requires three ports; one for management, one for viewing live video, and one for viewing recorded video. These ports must be opened for both UDP and TCP proto-
MANAGED NETWORK PROBLEMS & SOLUTIONS When dealing with an enterprise-level LAN net- work, in most cases there is one or more IT per- sonnel who are responsible for programming and running the network. When IT people are available, the smart technician will discuss the connection of the IP-enabled security devices with them and together plan for the static IP, subnet mask, default gateway, and port(s) to be used for each device. If the IT personnel do the firewall settings properly, all should go well provided the security technician accurately programs each device. Don’t forget to test each cable being used.
Once the system is up and running, an all-too-
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familiar problem occurs when IT personnel make hardware and/or software changes to the network without considering how these changes will affect the electronic security systems. Changes in man- aged switches can disconnect devices or choke down the available bandwidth to an IP camera or encoder, reducing the quality of the live and recorded image viewing. When a problem appears in a device
that was previously working well, the steps for the technician are relatively sim- ple: First, confirm that the device is still connected to the network by viewing the “happy” LED, which is usually present on most security devices. If it’s lit or blink- ing, the device is connected. If the LED is dead, check the cabling to the switch; perhaps the device has been unplugged within the telecom closet. A simple recon- nection may be all that’s needed to bring the device back into service. If the device is connected and prop-
erly powered, but still isn’t performing properly, check with the IT personnel to see what changes they’ve made recently in their network that might have affect- ed the throughput or functionality of a security component. The upgrading of a switch or router, or a change in cabling may instantly disable a security device’s communications. In most cases the new network devices can be reprogrammed to allow the IP-enabled security compo- nents to regain their functionality. ■
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