Sunday, June 2, 2019

Why network monitoring appear delay?

Why network monitoring appear delay?

Speaking in the security industry network monitoring delay, I am afraid we have become a well-known disadvantages of. However, the delay in the end it is because of what reason?
Find out your camera’s IP address by checking the camera’s directory. Once you find your address you will be able to ‘ping’ it using your laptop or smartphone to test the strength of the connection.

Type ‘cmd’ into windows search engine and this should open a DOS command prompt. When this pops up, you will be asked to type in ‘ping’ and your IP address. You may see either ‘Request Time Out’ or ‘Destination Host Unreachable’ appear on the screen. If it does, check to see if the device you are using is on the same network as your camera. If you do see the camera on the network, attempt to connect using your browser.

If you have more than one camera you need to make sure that they have different IP addresses as this can stop you from accessing one or all cameras.


1- For network monitoring, the network bandwidth limitations make ip surveillance has been part of a headache. Because of this restriction, so forcing the network to monitor the transmission had to give up some very important things. In general network transmission systems, the router is the most important and most complete system indispensable equipment. But may not so friendly router for network video transmission. Since the transmission, routing forwarding takes some time, so the more transmission through the router, the greater the delay data. This also allows long-distance transmission, the delay has become an inevitable thing.

In addition to the router, quality, high-pressure line network traffic are also causing delays culprit.

2- Check the Cabling: If the camera's link and/or activity lights aren't blinking, it's likely a cable. A high frequency of connection issues centeraround cabling problems. Basic IT troubleshooting places a huge emphasis on checking transmission cables. Since the final assembly is only as robust as it's weakest link, checking data cables for kinks, frays, shorts, and bad terminations is a very basic troubleshooting step. Cable and patch panel connections made in a hurry by hand can get crossed wires or connectors come loose.

Sometimes the power wires to a PoE camera in the cable may be powering the camera up, but the data wires may be crossed or not connected preventing network connection. To troubleshoot, use a cable tester to test the cabling or use a known good cable to connect to the camera and see if it connects. If a patch panel is used, check the patch cable, that often gets overlooked.

3- Consuming signal processing network hosts 

In the transmission network, the codec is the main factor universally recognized time-consuming. As the network video surveillance system decoding devices are often used for client host. Therefore, host configuration also directly affect the quality of the transmission rate of the entire signal. If you catch a comparison of old and sick host device, then the delay phenomenon is certainly indispensable. 


4- If possible, look at the camera to make sure it is powered up. Most cameras have LED's that indicate the camera's power status, and if it is connected to and transmitting data to the network. Many times these LED's may be concealed inside the camera's housing. If the camera is externally powered (non-PoE) check the power supply if no LED's are lit.

If it is a PoE camera and not powered, check to see if it is plugged into a PoE switch or midspan. Verify that the camera is receiving the proper wattage of PoE power, outdoor cameras with heater/blowers and PTZ cameras often require High-PoE or PoE+ 30W or 60W of PoE power that is higher than most standard 15W PoE switches provide, often requiring different wattage midspans. Some cameras that require >15W of power will boot up and connect with 15W, but not transmit images or respond to PTZ commands.

Another pitfall may be the PoE network switch itself. Some PoE switches do not have enough power to supply 15W to every port and will not supply power to another camera if it is already overloaded. To troubleshoot, connect the camera into a suitable PoE injector or midspan to see if that is the problem.

5- Network transmission, the encoding process itself takes 

Due to the daily video transmission, analog and digital conversion is also a consumer point of time can not be omitted. Currently, in order to obtain a better picture quality, many manufacturers are adopting nowadays the most advanced H.264 compression algorithm as its own. But, when the image scene more complex, more moving objects, the greater the time frame rate and bit rate, H.264 category using the higher level, the greater the difficulty of codecs, time-consuming naturally the more and more. 


6- Don't be a hero, call for help: If you have tried the above steps and still cannot connect to the camera, visit the manufacturer's website for specific model troubleshooting guides and if those do not help, call the camera manufacturer's tech support line. Many times they know "tricks" specific to their hardware and can remotely connect to your PC via the internet to diagnose. Don't be afraid to ask for help, many times technicians waste hours tracking down a problem that the manufacturer's help desk representative can fix in a few minutes. The manufacturer's technician can also start an RMA process to return the camera if it is faulty and needs to be repaired or replaced under warranty.


11 comments:

Anonymous said...

Many enterprises segregate their networks using VLANS with managed switches. Sometimes network teams move vlans around or move cables to different ports on switches. They can inadvertently rmove a camera from a working VLAN for the VMS system to a different network thus rendering it uncontactable. Ensure that proper cabling is in place. And keep up to date documents of network design.

Chris Dearing said...

most mfrs provide a discovery utility that only finds their cameras, like axis ip utility, or dahua config tool.

They work by broadcasting at the Ethernet layer directly and will find anything with their company's MAC prefix. they require u be on the same switch segment tho.

After that they will let u change the IP address. It's really the quickest way to go if u have the utility.

If the finder can't find it its a probably a physical cable problem. not sure if it works with wireless products since layer 2 broadcasts are usually not repeated by access points...

Ray Bernard said...

Hi Arindam, I would also put somewhere in the list: "check the logs".

For example, a System Report on an Axis camera will tell you all kinds of information, and in the preventive maintenance programs we set up, we include a periodic review of those reports. Other brands of cameras also have logs and reports.

As a general practice we also establish network monitoring of the cameras and switches, and syslog monitoring for the cameras where supported, and check those logs periodically - and also check them as an early step in troubleshooting.

One of the advantages of logging is that you can often find when a problem started, and match that up to some event or change such as a power outage or network reconfiguration.

Of course the particular starting point depends upon what kind of trouble it is. If the camera won't power up, obviously you can't get a report out of it.

Sundarajan said...

Hye... Nice...

I really, really like comprehensive troubleshooting-step lists... back in the day, I used lists like this that I made up for every new tech I hired - for each type of issue - whether they were new at support, or already perceived themselves as 'veterans'.

Two important things to add (imo) are:

1. The importance of the 'isolate & eliminate' principle when troubleshooting. i.e. you must isolate one item at a time when troubleshooting in order to eliminate this as the source of the problem. Seems simple and obvious, but I've seen and heard techs many times who change two things at the same time while trying to find root causes. Makes my head explode when I hear it. You prove nothing if more than one variable is changed before validating anything.

2. The order in which you perform these troubleshooting steps. I've seen plenty of 'veterans' spend an inordinate amount of time troubleshooting stuff because they don't understand the percentages: the 'likelihood' of each step helping to determine the problem. IMO, you should troubleshoot based on what is 'most likely' to be the root cause (based on experience). When you have a big support crew with hundreds of calls daily, this becomes huge...

For the list above, I would put them in this order:

# Verify Camera Power/Connection
# Ping Camera
# Know UserName/PassWord
# Check ARP Tables
# Confirm No IP Conflict
# Disable Antivirus/FW
# Reboot Camera
# Check Cabling
# Factory Reset Camera
# Call Support

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