Optical Cables is there a differance?

Discussion in 'Cables & Switches' started by tankrs, May 31, 2008.

  1. tankrs

    tankrs
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    Hi everybody,:hiya:
    Is there a differance between cheap and expensive Optical cables. I dont want to pay a Monster price ( I`m sure you know what I mean) for a cable if a cheap one will do do the same job. I`m after 2x1m and 1x2m. Any suggestions on best place to buy?
    Thanks
    Tankers
     
  2. spl23

    spl23
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    No, there is no difference between cheap and expensive optical cables. Maplin or similar will sell cheap ones that work fine.
     
  3. Alan Mac

    Alan Mac
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    Cheap optical-fiber cables will indeed work fine for SPDIF connections.

    But even the cheapest optical-fiber cable is considerably more expensive than a cheap RCA-phono plug lead of similar length.

    So if you have the option to choose SPDIF transmitted over co-axial cable then it should be cheaper to take it.


    Alan
     
  4. pjclark1

    pjclark1
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  5. danmc_82

    danmc_82
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    I'd spend my money on descent bulid quality as you dont want it to fall apart in your hands.
     
  6. Alan Mac

    Alan Mac
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    I agree these are very cheap. But RCA-phono cables are much cheaper still!

    99 pence for 1 m of optical cable with connectors

    29.5 pence for 1.2 m of RCA-phono cable and connectors.
    (You get 2 cables for 59 pence !).

    The RCA-phono connector is also probably more reliable mechanically.

    http://www.cableuniverse.co.uk/catalog/cables/2-rca-plug-to-2-rca-plug-budget-12-metres.html


    Alan
     
  7. Welwynnick

    Welwynnick
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    I'm not going to take issue with all the regulars around here, but I thought it might be worth metioning that many people have said that glass toslink cables perform better than the usual plastic cables. I am absolutely not going to justify that, so make of it what you will, I'm just conveying what is quite a considerable body of opinion. I now have a plastic and a glass cable, and will do a comparison between them in due course. I don't care which is better, I'll just sell the other one.

    regards, Nick
     
  8. Alan Mac

    Alan Mac
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    In an optical-fiber cable, the bandwidth for a given distance is limited by dispersion.

    The bandwidth-distance product for a typical plastic fiber is about 2 MHz . km.

    The bandwidth-distance product for a quartz fiber is typically about 500 MHz . km.

    Which means that for a 3 m long plastic fiber cable the bandwidth is about:

    (2000 MHz . m) / 3 m = 667 MHz


    For a quartz fiber, 3 m long the bandwidth will be about:

    (500 000 MHz . m) / 3 m = 167 GHz


    Both bandwidths would seem “adequate” for SPDIF (!)


    Alan
     
  9. tankrs

    tankrs
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    Thanks for you replies,:smashin:
    the reason for asking question was i want to output tv sound(46x sony) to amp (sony es3300). So I`ll try both conns to see what works best.

    Tankrs
     

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