aurmol

http://lmgtfy.com/?q=computer+networking+101 http://lmgtfy.com/?q=what+is+network+router http://lmgtfy.com/?q=what+is+network+switch Done it for 2 days. But it doesn't answer what is the difference if you connect the NVR to a switch together with other ip cams or if you connect the NVR to a router and switch with ip cams connected to that router.. what is the subtle difference in the packeting? Do all NVR search for ip cams by the MAC address or ip address? and if ip address.. but a switch doesn't have any ip address capability.. just MAC.. so herein lies the big mystery

Isn't it that in the first nvr and external switch.. you plug the nvr to the switch together with the 4 ip cams direct to external switch.. this means switch is sufficient... so why can't a second nvr be connected to the switch too? why a router required assuming no internet would be established.. just want some understanding before I pull out many wires to test the possibility of 2nd Nvr.. thanks

I will get the exterior poe switch next week and experiment with 2 nvr on 1 ip cam... and I've been researching about network switch vs router vs hub, access points the past few hours.. I need to verify something... So after I bought the 8 port switch with 4 poe ports.. should I plug the nvr to the switch without using a router or should I plug the nvr to a router and the ip cams to the switch... what would be the difference if I connect the nvr to the router port or to the switch port (in this latter imagine the router and nvr and all 4 ip cams connect to the switch). Without a router, I know I know manually set the ip address of each ip cam and the nvr. If I do this. Then a switch is sufficient and a router not needed (supposing no internet wil be connected)? Hence the purpose of the router is just for internet and auto dhcp (that you can manually do in a pure switch setup)?

First time for me to hear about using 2 NVRs on 1 ip cam. Call all ip cam do that? How do you know which can and can't. I have a second extra nvr and one concern of mine is what if the main nvr is stolen. So I may just add that second extra to the network. But all my 4 ip cams are connected to the built-in POE switch of the NVR4204. I can't even access the web server of each 4 ip cam to adjust WDR for example. Do you know of the smallest 4channel poe switch dat can do that? My main nvr is hidden in a very small box and big switch may not fit anymore. Also when you mentioned "must homerun cables to the dvr".. isn't this what we do also when we connect all ip cams to the built-in poe switch of the nvr? You will need a switch..they are under 50 dollars (4 ports poe)http://www.amazon.com/TP-LINK-TL-SF1008P-100Mbps-8-Port-802-3af/dp/B003CFATT2/ref=sr_1_1?ie=UTF8&qid=1418521807&sr=8-1&keywords=poe+switch&pebp=1418521607393 I never tested two NVR's, but you can easily do this with 1NVR and say a pc NVR running any vms...with two NVR's they may both be sending settings to the camera (so im not 100 percent certain it will work)...you can also have the cams write to nas..many ip cameras also have SD cards slots in them as well if you want backup... And yes, you have to home run if you want to use an NVR with built in..but why? Its much simpler to use a switch.. This way, say you have 4 cams on one side of your house and the nvr is on the other, you just need to run a single cable... I have 2 NVRs.. one is a dahua.. another is jovision.. the jovision can't do motion detect, video detect and can't seem to access the inside of the dahua ip cam... does this mean the jovision can act as second NVR.. the rule being that you can't use 2 NVRs of the same brand as the ip cam because they both send setting while using another brand NVR would only record and can't send any setting? Anyone got a theory? It's difficult to access my hidden main NVR and do the testing and I don't have a separate POE switch yet, the 4 existing ip cams are homerun to the NVR poe using 4 separate 20 meters lan cable.

First time for me to hear about using 2 NVRs on 1 ip cam. Call all ip cam do that? How do you know which can and can't. I have a second extra nvr and one concern of mine is what if the main nvr is stolen. So I may just add that second extra to the network. But all my 4 ip cams are connected to the built-in POE switch of the NVR4204. I can't even access the web server of each 4 ip cam to adjust WDR for example. Do you know of the smallest 4channel poe switch dat can do that? My main nvr is hidden in a very small box and big switch may not fit anymore. Also when you mentioned "must homerun cables to the dvr".. isn't this what we do also when we connect all ip cams to the built-in poe switch of the nvr?

I live in another country. They don't have the 4200S. Only the 4200E where I bought 3 pcs.. then realized the cvi costs 2.45 times less. The 4200S and 4200E both have the same 1/2.8" sony sensor and everything the same except I think the housing and the IR leds.. don't you agree? I should have gotten the 3mp aptina sensor as buelllkingle reports has better dynamic range than the sony exmor. I used them at business. Now I need another set of cctv for my home and wondering whether to get cvi or the 5mp ip cam to monitor the doorway. Do you have any idea how exactly they modify the analog output of the cvi to travel in the coaxial? Like can you put a monitor direct to the cvi? what conversion logarithm say an adaptor must need to convert the signal to that of standard video? CVI signal cannot be view using a normal monitor. The CVI chip is actually a transport for the HD signal. In simple terms, Camera side encode & the DVR side decode. Currently only encounter CVI fiber converter & yet to have seen CVI to Analog. And if you compare the distributor pricing for HAC-HFW2200S & PC-HFW4200S it is about double. End user pricing may varies due to company markup. You are one of the few users of hdcvi here.. so you believe there is very poor dynamic range in the images in all models? Do you think it's because the encoding remove the data or they just should cheap lens to begin with. Do all pictures you take are faded like grey mists over the image? I want to know what exactly caused it. Most people elsewhere including my local distributor believes sdcvi even beats ip cam in image quality without testing (bec they just see no latency) so they would soon be selling them as basic.. the d1 analog and the more ip cams would be faced out.. only items left are the hbcvi.. because they told me and try to convince me the hdcvi totally beat ip cam because of "superior image quality bought up by zero latency).

My main application is just occasional viewing of an empty warehouse. I log in cms, view a picture, take snapshop.. that is.. I can't view long because my country isp are slow and they have limits on that you download. For example. if you remote view the cctv for more than 5 minutes. They would cut your internet connection for the whole day. 2nd offense they would ban you permanently. So I'm thinking is there a say 12M cam that you can take critical snapshot remotely and viewable at home. Imagine the comet lander. They use low res video but very high res still picture. Likewse this would be useful in cctv, to have the normal resolution for recording and a much higher megapixel 12, for takin snapshops with say 1 frame per 2 seconds and uploading to the user.. during such emergency snapshop. You can resolve 3x more then maximum basic resolution of your cctv. Budget is maybe $150 top for this product that one can make by just adjust basic parameters and adding some interfaces.

By the way. For a $1,600 5mp cctv.. what is your estimate of the real manufacturing cost of the camea. I think it's just $200. So they are making a $1,400 profit. And customers even support them buying them.. so isn't the overpricing somewhat abusive thing already? Or do you honestly believe it takes say $1,400 to manufacturer a 5mp.. who knows.. these sensors may even be overstock from the days when 5mp digital camera reign.. early 2000s. So these manufacturers like Bosch, Axis are making a killing or excessive overpricing. Dahua costs 5 times less and they are already making incredible money. What more those Bosch.

For cctv camera with varifocal motorized lens (but without ptz).. is it possible to use some kind of adapter to convert this to make possible ptz remote access of the varifocal motorized lens? (like zoom in ptz)?

But 1080p cvi seemed to have bad contrast that its dynamic range reduction can greatly reduce the resolving power and resolution maybe even lower than 720p. Are you familiar with those black and white bar chart and resolution test with decreasing contrast. Contrast can lower resolution and resolving power. I have scout the net for any reviews of hdcvi, hdtvi, ahd versus ip.. there is none. Why is there not even one reviews of them. If anyone has even encountered, please share it with us. Thanks.

What I meant was 12mp still camera.. not video.. I don't think there is a phone that can record 12mp video. Note the dahua 5mp is the same price as 5 pcs of 1080 hdcvi. So unless the 5mp is of superior dynamic range.. won't it make sense to put 5 pcs of 1080 hdcvi spread over the doorways and sides. My use is just outside the house and if I put 5 pcs of hdcvi (same price as 1 5mp cam), the robbers have to come together in 5 to disable them at same time, instead of just one. Also any evidence 5mp cam has higher latency than 1080p ip cam. If the delay is even 2-3 seconds worse than 1080p ip cam, then 5 pcs of hdcvi is a clear answer.. you want real time view outside the house when you are holding the submachine gun trigger.. lol.. just kidding.. but 5 pcs real time analog 1080p may just blow any 5mp cam.. won't it.. unless you want to monitor the neighbors outside across the street. If your network is of decent quality you should not be getting any noticeable latency (a few hundred milliseconds at most)...it could be your network or NVR that is causing your issues... Are you saying each ip cam has to adjust its cpu to make sure the encoding won't take a certain hundred milliseconds (any standard limit they folloo).. for example if you put slow cpu in the 5mp, it would take 2 seconds to encode into H.264.. are there no manufacturer that do this? or do some do this and would tell you at least it's 5MP and cheap price even if the encoding takes 1.5 to 2 secs...

I live in another country. They don't have the 4200S. Only the 4200E where I bought 3 pcs.. then realized the cvi costs 2.45 times less. The 4200S and 4200E both have the same 1/2.8" sony sensor and everything the same except I think the housing and the IR leds.. don't you agree? I should have gotten the 3mp aptina sensor as buelllkingle reports has better dynamic range than the sony exmor. I used them at business. Now I need another set of cctv for my home and wondering whether to get cvi or the 5mp ip cam to monitor the doorway. Do you have any idea how exactly they modify the analog output of the cvi to travel in the coaxial? Like can you put a monitor direct to the cvi? what conversion logarithm say an adaptor must need to convert the signal to that of standard video?

What I meant was 12mp still camera.. not video.. I don't think there is a phone that can record 12mp video. Note the dahua 5mp is the same price as 5 pcs of 1080 hdcvi. So unless the 5mp is of superior dynamic range.. won't it make sense to put 5 pcs of 1080 hdcvi spread over the doorways and sides. My use is just outside the house and if I put 5 pcs of hdcvi (same price as 1 5mp cam), the robbers have to come together in 5 to disable them at same time, instead of just one. Also any evidence 5mp cam has higher latency than 1080p ip cam. If the delay is even 2-3 seconds worse than 1080p ip cam, then 5 pcs of hdcvi is a clear answer.. you want real time view outside the house when you are holding the submachine gun trigger.. lol.. just kidding.. but 5 pcs real time analog 1080p may just blow any 5mp cam.. won't it.. unless you want to monitor the neighbors outside across the street.

Thanks for your information. Before I avoided the 4MM because of narrow angles.. but checking out dahua only 5mm bullet cam at 4MM. I realized it has 82 degrees angle of view.. even wider than the 3.6mm 1080 at only 72mm.. but I don't know how it would behave when 16:9 versus 4:3. It seems Hkvision can make you use all resolution below it with no loss of area while the dahua may seem just cut the view left and right. This is what happened to their 2.8mm 1.3M aptina. When switching to 720p, the vertical get cut. When switching to D1. The horizontal get cut so you only have 60% of the area of 1.3Mp. I wonder what would happen to the 5mp dahua if you want only 1080p temporarity. If anyone has idea. Please let me know. Thanks.

Just checking the price. It's exactly 2.45 times. You can get 2.45 times of this http://www.dahuasecurity.com/products/hac-hfw2200s-517.html with 1 pc of this http://www.dahuasecurity.com/products/ipc-hfw4200e-509.html 2 months ago I got 3 pcs of this. If I got the Hdcvi.. I could have gotten 3x2.45 = 7.35 pcs of the hdcvi's at same price.

Many people dislike Hdcvi and other analogs because they have poorer contrast. But Hdcvi are 3 times cheaper than ip cam. Now if you get 3 pcs of 1080p Hdcvi and put it in your target area versus just 1 pc of 1080 ip cam. Would the ip cam still resolve more than 3 pcs of hdcvi (same price)?? If yes. Then I'd get an ip cam. If no. Then i'd get 3 pcs of hdcvi for the same price as 1 ip cam. Pls. advice. Thanks.

Your assumptions are correct here. This could be a classic example of Sony (IP) vs. CMOS (CVI), but I can only show you what Dahua has to offer so far. The standard 2MP fixed bullet from the first image was an Aptina but the contrast is still a noticeable improvement over the CVI bullet. What sensor does the CVI bullet use? sony or aptina or other brand? It's not written in their website.. can you please take a look inside the actual CVI unit.. tnx

In other words, hdcvi has less dynamic range than ip cam? is that what you meant? What if a good sensor with very wide dynamic range is used.. then the hdcvi would excel in contrast?

but 1/2.8" vs 1/3" with mere difference of 1/0.2" is almost insignificant. I think dahua sensors are all 16:9. In their 1.3Mp and 3Mp models 4:3 sensors. It's like dahua just cut the sides. This occurs to both 1.3Mp and 3.0Mp in all models at 3.6mm at mere 72 degrees field of view. Only the 1080p 2Mp dahua ip cams are wider at 88 degrees... the 16 degrees of difference can't be caused by the mere difference between 1/2.8" vs 1/3" sensor.. would it? A 1/2.8" sensor is 18% bigger than a 1/3" sensor. So 72º * 1.18 = 85%. I am not saying that is the explanation, but it would make sense. Well... The domain http://www.NetworkCameraCritic.com should give you an idea on what he reviews, network cameras. I will guess that's why he hasn't reviewed any HDCVI cameras, because they are not network cameras. Just my guess. Why did you get the 18% figure? Let's compute 1/3"=0.3333333333333^2=0.11111 1/2.8"=0.357^2=0.12755 0.12755 is just (0.12755-0.11111)/0.11111 or 0.147 larger than 0.11111.. may I know how you compute the 18%? Thanks!

Here is a clip with WDR and what is it you want to find online? 7jSasyX_9BQ I wonder why there are zero review of the image qualities of the hdcvi, ahv, hdtvi compared to ip cam in the net. What key did you press to bring up the cam setup menu in the hdcvi dvr? In the ip cam, you need to get inside each cam to adjust the wdr.. the nvr menu and even smart pss can't make you adjust them the same you did..

I can't find this in the net. Can you turn WDR (Wide Dynamic Range) on and off in the Hd-cvi? If not.. is their default on or off?

I think a more interesting comparison would be knowing if the Hd-cvi or the sony exmor ip cam are better in the contrast.. we know the aptina sensors would be better than the hd-cvi... Buellwinkle.. why haven't you tested/reviewed any of the hd-cvi? and how come the field of view for all dahua hd-cvi are totally unknown or not written in the spec such as: http://www.dahuasecurity.com/products/hac-hfw2200e-608.html Any idea of the field of view angle?

No one. Just their website. 2 months ago I was deciding whether to get the 1080p or 3Mp. But the former is just much wider so 3 of them. Now I need another one and thinking whether to try the 3Mp. I thought Sony Exmor is always better than Aptina. Do you have other reference why the Aptina has wider dynamic range? Yes. Sony Exmor gives very nice picture. If I got the following model. Would it have high dynamic range too (but it says S/N: 50 db)? I can't return it once ordered. But the much lower 72 degree angle keeps me thinking otherwise. http://www.dahuasecurity.com/products/ipc-hfw4300e-510.html The one you reviewed was 4300s.. the above is 4300e.. any idea what is "s" versus "e"? If it has wider dynamic range.. then I'd get it and sacrifice the wider view. And why can't dahua produce an 88 degree version of its aptina 3Mp?

2 months ago I was deciding between their 1080p or 3Mp. But I got the 1080p because they are all 88 degree field of view versus the 3Mp 72 degrees. Now if you will notice, the older 1080p, the one you reviewed, the Dahua ipc-hdbw2200e was already discontinued. It was the only one using 3Mp sensor to give 1080p at 72 degrees by probably cropping the vertical to make it 16:9. The latest 1080p now all use the same new 1/2.8" raw 1080p sony exmor sensor with 88 degree angle while all 3Mp that uses the 1/3" aptina now are 72 degree. Dahua doesn't have any 1080p now using 3Mp aptina sensor. If you have any review of the latest sony exmor used in 1080p, please. share it to compare it to the older model sony exmor used for example in 3300S.. unless you are saying the 3300S (older) and 4200S (below) uses the same sony exmor sensor?? but the new one is 1/2.8" while the old one you reviewed is 1/3".. the one where you mentioned has poorer details than the 3Mp aptinas. I wonder how the new 1/2.8" sony exmor used in 1080p compared to the 3Mp aptinas now. I'm deciding whether to get another sony exmor or the 3Mp aptina with narrower field of view but taking advantage of possible deeper dynamic range. http://www.dahuasecurity.com/products/ipc-hfw4200e-509.html http://www.dahuasecurity.com/products/ipc-hfw4300e-510.html

note 1/2.8" = 0.357" and 1/3" = 0.333" now 0.357" - 0.333" = 0.0236"! So it's much less than 0.2" difference.. its 0.0236 inches and pretty small and insignificance... are you still saying the 16 degree field of view difference between the 1080p and 3mp is due to the 0.0236 inch (0.6mm) sensor size difference? or dahua all use 16:9 sensors and jus cut the sides in the 1.3mp, 3mp models.