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Cortian

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Cortian last won the day on March 30

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  1. Cortian

    Cat and Cat5e?

    Often it's not the cost of the cable, but the cost or difficulty of running it. That was why, when I did new cable installations for my employer, I always ran 25-50% more runs than the projected need. (And, when they recently switched from a legacy phone system to IP phones, it still wasn't enough. But they only had to add a dozen or so new runs, so not bad for a 20-year-old install with close to 500 runs ;).) Terminating existing cable is inexpensive and trivial. I'd terminate it, try it, and see if it worked. If not: Then replace it with Cat5E or Cat6.
  2. Cortian

    IP Camera

    Can't go 900 ft. with twisted pair Ethernet without powered repeaters. Max is 100 meters (328 ft.). And even that may be pushing your luck with PoE, depending upon the load.
  3. Cortian

    Hello all

    Welcome, Daniel
  4. Cortian

    Need a really good hd nightvision cctv cam

    Define what you mean by "HD," please? Technically speaking: "High definition" is 1280x720 or better. That would be a 2MP camera. Secondly: As resolution (megapixels) goes up, light sensitivity drops and noise increases. Thus, in low-light conditions a lower resolution camera can out-perform higher-resolution one for image detail. Search on it. There are plenty of real-world examples. As an example of sensor megapixel count vs. light sensitivity, consider the specs of two otherwise identical cameras: The Dahua IPC-HDW5231R-ZE (2MP): Minimum Illumination: 0.006Lux/F1.4 ( Color,1/3s,30IRE), 0.05Lux/F1.4 ( Color,1/30s,30IRE) and IPC-HDW5431R-ZE (4MP): Minimum Illumination: 0.03Lux/F1.4 (Color,1/3s,30IRE), 0.3Lux/F1.4 (Color,1/30s,30IRE) The 2MP camera has five times the light sensitivity at a 1/3 sec. frame rate and six times the light sensitivity at a 1/30th sec. frame rate. OTOH: If you're relying on IR illumination it's not such a big deal and more megapixels may be advantageous for you. The other thing you may wish to take into account is your display capability. It boots nothing to have a 4K camera and a non-4K display. The camera may see the detail, and the NVR record it, but the display won't render it, so you won't see it.
  5. Cortian

    Chinese Surveillance System Manufacturers

    They're to be banned for use by government agencies and, I would expect, private businesses performing sensitive work for government agencies. They're not banned outright. However: This is a black eye for those manufacturers. Many companies will look at this and think "If it's not good enough for the government, it's certainly not good enough for me." I wonder if any non-Chinese tech firms will see this, realize they're being presented with a tremendous gift, and jump to take advantage of it? Btw: As far as we know, Dahua was simply guilty of poor security practices, as opposed to actual intentional nefarious activity. This is why I'm willing to give them a pass--with safeguards.
  6. Cortian

    Which security camera to purchase?

    Just adding a 3rd vote to Tom's and SL's. (With the exception of SL's comment, re: WiFi. Yes: Wired is way, way better. Particularly with video streams and when we're talking security systems. But a good WiFi system [most are crap] can work just fine, IME.)
  7. Cortian

    Indoor: Turret vs Dome?

    That's a bit inaccurate. Hikvision (and Dahua I believe?) are banned for use by the U.S. government. (And, likely, by US Gov't contractors and others with sensitive US Gov't contracts.) They are not "banned in the USA." Nobody's suggesting a firewall should be one's first line of defence. Egress filtering on a firewall's there in case other measures fail. E.g.: I would not buy and use Dahua cameras were I not relatively satisfied with Dahua's explanation of what happened and their assurances they've addressed it. My LAN and Internet border security measures are just in case they're misleading me, after all, or for potential future issues. That being said, and I meant to address this in my earlier comments, but forgot: The measures I've taken are well beyond the capabilities of the average (read: consumer) Internet user. What should really happen is Internet border routers should be configured for security stances similar to what I've described out-of-the-box. Problem with that is: Then a lot of plug-and-play IoT things would be difficult to get to play. It's the same reason MS-Windows was was so easy to compromise for so very long. If Microsoft had made it half as bullet-resistant as they should have: It in all probability would not have achieved the wide acceptance from non-techie end-users it did. So: Manufacturers are damned if they do and damned if they don't. On the gripping hand: Shunning Hikvision because the U.S. Government (or whomever) suggests they're a threat doesn't solve individuals' network security problems. Anything consumers (and, by "consumers," I mean all consumers--residential, business and government) install on their networks, particularly IoT devices, can be a threat.
  8. Cortian

    Indoor: Turret vs Dome?

    Sir Lenscelot has the right of it. Proper firewalling consists of both ingress and egress controls. The default policy on the most effective firewall is "That which is not explicitly allowed is denied." That is somewhat impractical, taken to its absolute, wrt egress filtering, but you can take measures to limit your exposure. E.g.: The only device on my LAN that's allowed to make outgoing connections on port 25 (SMTP) is the home LAN server. That way, even if a desktop, laptop or IoT thing does become compromised with a spam-generating Trojan, it isn't getting anywhere. For my cameras: I've put them all into a particular subnet and blocked that subnet for all outbound traffic. (Inbound connections are always default denied.) Soon I'll acquire a managed switch for our LAN's "backbone." I'll implement VLANs and one of those will be a VLAN for only IP cameras. The border router will prohibit connections from that VLAN. That way: Even if some camera comes with malware pre-loaded, malware that's smart enough to come up with its own legitimate IP address that's not blocked by the border router, it isn't getting anywhere. In fact: All IoT stuff is going on isolated VLANs like that. Not only will that stuff not be able to get to the Internet, but it won't be able to get to Other Stuff on the LAN to which is does not need access. The only reason I didn't already have a managed switch is, until recently, it hasn't been particularly necessary. Now, with all the IoT stuff, it is. Indeed. Even I can't get directly to my IP cams from outside the LAN.
  9. Probably when you plugged the camera directly into the NVR if was given an address on a completely different network, which is why nothing on your network can see it. I don't know if Dahua IP cams have an external factory reset switch, but, if so, that's might be what you need to do. It might be the NVR gave it a dynamic IP address with a long lease, in which case your camera will eventually ask for a new address on your LAN. No way to know how long that will be. Could be quite some while.
  10. What I did for a living once-upon-a-time was design software for machine vision inspection systems, so I know just a little >< about how photo imaging sensors work. And, yes, digital camera photography is one of my lesser side-hobbies, so I know something of how that technology works, too. You can insist that photographic cameras not be brought up, but that doesn't change the fact they use essentially the same technology and are guided by the same laws of physics (as we currently understand them). "your [sic] adding more pixels to the same area...": Bingo! And more pixels in the same area means the pixels must be smaller. QED. Tom, the pixel size directly relates to its light sensitivity. That's the whole point of this discussion. Provably false. (I've already explained why. I'm not going to repeat myself.) It is? Please show us the ™ or ® mark on Dahua's use of the term "starlight." Please show us where Dahua's technology licensees are acknowledging the use of Dahua's patented startlight technology. You cannot, because "starlight" is a generic term for imaging sensors and surveillance cameras that perform better than others in low-light conditions. This is evidenced, for example, in this Bosch press release: Bosch introduces latest starlight technology - The ultimate 24/7 IP video surveillance cameras just got even better, where "starlight" is mentioned with no attribution. And Dahua is using Sony STARVIS sensors, as demonstrated, for example, by Dahua DH-IPC-HDW5231R-ZE - 2MP WDR IR Eyeball Network Camera and other Dahua Starlight products which also prominently mention using Sony STARVIS technology. I'm not going to argue this with you any longer. I have design background, technology experience, facts and documentation on my side. You have beliefs based on what is apparently an incomplete understanding of the technology, which is now leading you to contradict yourself.
  11. A "DIYer" with backgrounds in both hardware and software design and who was once a Senior Software Designer in the vision inspection systems industry. Oops? As to your "there is no such thing as big or small pixels" assertion: If that were true, then for every doubling of pixel count they'd have to double the image sensor size. That would, in turn, require increasing the size of lenses to make up for the light loss otherwise incurred in spreading the same light over double the sensor space. The sheer cost increase in fabricating them (the bigger the lens the harder to fabricate w/o various distortion artefacts) would make high-megapixel cameras prohibitively expensive. Obviously the lens on an 8MP camera isn't four times the size of that on a 2MP camera. (In fact I expect they're using the exact same glass on both.) In any event, your assertion is provably false, as evidenced by Sony's STARVIS CMOS sensor specs: CMOS Image Sensor for Security & Surveillance. The Dahua Starlight camera I recommended uses a Sony STARVIS CMOS sensor, which I'm led to understand is regarded as the best low-light sensor in the industry. So, unless Dahua's degrading the performance of those fine sensors in their software or with inferior glass, Dahua cameras should perform as well as anybody else's using the same sensor.
  12. The manufactures aren't all wrong, it's just that "pixels sell" and bigger isn't always better. E.g.: When my wife and I were getting set to take a vacation in Europe last year I spent more than a few hours qualifying a good camera that would be the best compromise between being easy to haul around and having acceptable image quality under varying conditions. No matter how many times I found myself trying to go for more pixels: In test-after-test and comparison-after-comparison the Panasonic Lumix DMC-FZ300, which had a comparatively "low" pixel count, kept winning. Why? In part because of its low-light performance. Compared to cameras with twice the pixels or more: It captured higher-quality images, with much lower noise, in challenging lighting conditions. All the pixels in the world don't matter if the image is buried in noise. Wasn't the most expensive camera in its class, either. Heck, the macro lens for my Canon body cost twice what that glorified P&S camera did. So, while "2MP is old": "Old" does not necessarily equate to "worse." It's been proven, time-and-again, in real world tests and installations, that nothing beats a 2MP Startlight camera in low-light. That being said: I, personally, have no experience at all in this field. Something to which I've admitted several times. My opinions are based upon the reviews, opinions and tests of others. Some of those others, btw, are experts in their field. Some of them are relatives of mine that operate a highly-successful surveillance systems company. They concurred with my findings: That, short of cameras costing 3-5x more, nothing beats the Dahua Starlight cam I chose for outside use in low light. "Better day and night" was not my assertion. We're talking solely about low light performance. (It's in the thread topic. As is his desired price point.)
  13. Tom, you usually supply good advice, but you're provably wrong on this count, for the reasons I've already detailed.
  14. You're welcome. I'm new, very new, to this, myself. So I cannot in good conscious recommend anything, per se. All I can do is share the decisions I've made, so far, based on my own research. To that end: If you're looking for an outdoor, low-light PoE IP cam: The one camera is my only suggestion. I'm sure they have other 2MP Starlight cameras in other form-factors. I would only suggest you probably want to avoid domes for outside use, as they get dirty and the plastic gets degraded by UV, both of which lead to fogging the image.
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