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cctvikidis

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Posts posted by cctvikidis

  2. Posted

    Almost every 2megapixel h264 camera produces a max of 6mbit stream, so if you will have a constant max stream of 144mbits from the cameras.

    Now you can not give power to 24 cameras and to poe switches through one utp cable. Its impossible because cameras consume much more power than ip phones and other small poe devices. Now if you use one utp for network and one power cable for powering the cameras and the switches you will have to buy less expensive switches and you will get 1gb link between the nvr and the cameras.

  9. Posted

    HD-SDI is pure digital. HDCVI/HDTVI/AHD are modified analog signals. So the latency in all this systems is always close to 0.

    HD-SDI has BY FAR the clearest picture in all this protocols and also the same happens if it is compared with IP Cameras, because of it's uncompressed digital stream.

    But it has also some severe drawbacks like that problems with interferences which are caused by gsm phones and cell transmitting equipment and the inability to connect them through CAT 5/6 network cables without using super expensive baluns.

  10. Posted

    https://www.linkedin.com/today/post/article/20140912094320-252393278-let-s-talk-about-cvi-tvi-ahd

    This article speaks the truth about all this protocols.

    The most problematic of these 3 standards is AHD by far.

     

    It seems to me that the article is 50% correct. That means 50% wrong. The AHD could be the best one, simply because it is most recent.

    But you may take 100% of comments from survtech.

     

    All of them are working hard to improve its video quality and long distance performance. We may expect good results sooner or later.

     

    In the AHD part it's absolutely correct as i have found myself working with an AHD dvr.

    The article is failing mostly on the HDCVI.

  20. Posted

    Never used Dahua cards so I can not help. But I have installed and sold quite a few Hik cards, and I have never had a single one fail or give me problems, so I do wonder why anyone would think that they are "very badly crafted cards"...

     

    I have installed over 1000 of hik's cards and about 100 dahua cards VEC80XX series myself. The other dvr components (m/b psu case etc) are about the same. Until now i never had a single vec card returned as bad. When i was using hik's 40xx cards i have had over 100 of them returned as bad.

  21. Posted

    Hikvision are very badly crafted cards, they break down like hell (with the common dsp error to haunt most of our machines). For such small deference in picture quality i still prefer dahua cards by far. Compare the pcb

     

    The biggest advantage of hikvision card products are the clients. Hikvison made a fantastic mac client that works only with their software and not with the one that you used here.

  24. Posted

    Hi

    Did you do figure out if this dvr has mirroring capabilities ? I read from the manual that you must specify a hard disk as redundant, You say that you grouped all 4 hard drives in 1 group so by the manual you can not enable the redundant capability. In order to do that you have to break one of your hard drives from the group and set it from disk management as redundant. After that the manual says you have to go to the schedule menu and enable the redundancy in the cameras that you want.

     

    If you manage to do that, please tell me if this works ok and with out glitches

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