9 ft. Optical Patch Cable Length for Pioneer DVD?

Posted by Nicholas Rexing on September 17, 1998 at 20:50:58:

In Reply to: 9 ft. Optical Patch Cable Length for Pioneer DVD? posted by SMR [WizOp] on September 16, 1998 at 21:19:59:

I understand your response. However, why would Pioneer call this out specifically? As an example, we know that light travels various paths through a fiber depending on the characteristics of the media, cladding, etc. and the quality if the laser. Now I'm way out of my league here, but I'm lead to believe that (depending on these characteristics) it may take several feet before there is the equivalent of an electrical leading edge that accurately represents the timing of the light pulse. If this is true and the link is short then the receiving optical-to-electrical device may have a difficult time resolving when to switch between a logic low and logic high. This would have the effect of changing the electrical pulse widths or the timing between pulses. I speculate that a long link cable has a filtering effect on the light and allows the light to, if you will, converge into a coincident wave to assure accurate conversion at the other end.
>> Please, anyone who reads this, let me know if I'm totally out to lunch on this issue! <<
I have never seen this kind of recommendation with other equipment. Its certainly isn't anywhere in my amplifier manual (although its a receiving device). I don't have experience with other digital output devices and therefore, have no idea if this kind of recommendation is common or if recommendations exists at all. I'd love to have a Pioneer engineer respond.

: Nicholas,

: There is absolutely no need for the Tos-link optical cable to be nine feet in length, all that is required is that the cable reaches from your transport to the Yamaha. Yes, optical cables can carry signals for many metres before the data has to be amplified and re-transmitted, so the length isn't a problem, it's just excessive.

:
: Stuart.

Follow Ups:

• 9 ft. Optical Patch Cable Length for Pioneer DVD? SMR [WizOp] 20:03:27 10/01/98 (0)

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