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**CCTV Questions? We are here to Help. (Tips and Sharing of Insights. Trading NOT allowed)

  • Kahit ano cabling type depende sa choice mo.
    Malapit lang yan basta maganda materials mo ;]
  • Ano po masuggest mo sir? Anong cable at paano ko po mabigyan ng power yung camera?
  • New installation po ba or additional itong gawin mo?
  • Mr. sherwincctvspecialist


    paki alis lang po ng pose niyo masyado ma init sa mata yan baka mablock ang room na ito

    pa usap na lang po

    salamat
  • sir isa pa marami taga DTI d2 make sure ligal yan mmmmmh ikaw din baka habulin ka nila
  • Good am Sir Toolkit1031

    Is this somewhat true regarding SDI and HDCVI Systems?

    TIA




    Can someone verify or have actual experience on HDCVI cctv, i found this link that says that I need to use only "good" coaxial cable since readymade amd utp+balun won't give a satisfiying result:

    Link: <click here for link>


    Plug-and-Play/Premade Siamese Cable
    25 Feet

    •Shadowing apparent around right side of head and left hand
    •Noticeably brighter contrast; likely lighting differential
    •No lines


    60 Feet

    •Shadowing significantly more obvious
    •No further effect on contrast
    •Lines begin to form; likely caused by the shadowing effect


    100 Feet

    •Shadowing continues to worsen
    •No further effect on contrast
    •Lines worsen


    150 Feet

    •Shadowing continues to worsen
    •No further effect on contrast
    •Lines worsen


    This cable type seems to work acceptably at 25 feet, but we would not recommend using anything longer in length than that. This is probably only possible for someone setting up a single camera system.

    RG59/U Siamese Cable - Copper Clad Aluminum
    50 Feet

    •Very small amount of shadowing apparent
    •Noticeably brighter contrast; likely lighting differential
    •Lines beginning to form around sign; likely caused by shadowing


    100 Feet

    •No increase in shadowing effect
    •No further effect on contrast
    •Lines slightly worsen


    150 Feet

    •No increase in shadowing effect
    •No further effect on contrast
    •No increased negativity on forming lines


    240 Feet

    •No increase in shadowing effect
    •No further effect on contrast
    •Lines worsen


    The copper clad RG59 cable appeared to cause some difficulty with the camera's ability to interpret the sign containing the lettering. As a result, that seems to be the only negative effects we encountered up to 240 feet. At approximately 260 feet, the shadowing and line effect quickly spread to other areas and by 300 feet, the image appeared almost identical as the image for premade cable at 150 feet. We would not recommend exceeding 240 feet as the image quality went downhill very rapidly beyond that distance.

    Cat5e Network Cable - Full Copper
    25 Feet

    •Shadowing already obvious around entire body
    •Noticeably brighter contrast; likely lighting differential
    •No lines


    50 Feet

    •Very slight increase in shadowing
    •No further effect on contrast
    •No lines


    75 Feet

    •Shadowing becomes much more obvious but still faint
    •No further effect on contrast
    •No Lines


    100 Feet

    •No further effect on shadowing
    •No further effect on contrast
    •No Lines


    Because the shadowing is very apparent right at 25 feet, we can not recommend using Cat5e cable with HDCVI cameras. As distance increases, the effect will completely distort finer details (i.e. - facial clarity).

    Cat6 Network Cable - Full Copper
    50 Feet

    •Shadowing becomes noticeable
    •Noticeably brighter contrast; likely lighting differential
    •No lines


    100 Feet

    •Shadowing effect increases
    •No further effect on contrast
    •No lines


    At short distances, Cat6 appeared as though it might be a solution, but when we hit 50 feet, it became obvious that it was not. Like Cat5e, because it can not maintain a clear image at short distances, we would not advocate it's use.



    -- edited by ChinaGroupBuy on Nov 21 2014, 09:07 AM

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