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06-09-2020, 10:51 PM
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#1
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Mortal
Join Date: Jan 2006
Location: Wickenburg, Arizona
Posts: 14,051
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Longest adat cables
Alesis specc'd ADAT cables for a maximum 5 meter run. I see people running 15-20 meter ADAT cables! I figure they are on the lucky end. But what about 20-25 feet? Should I be worried?
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06-09-2020, 11:58 PM
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#2
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Human being with feelings
Join Date: Oct 2007
Location: Lincoln, UK
Posts: 7,942
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Always wondered what would happen if you glued proper glass fibre in some TOSLINK ends. Probably too broad a beam for squirting down single mode fibre...
Edit: Wikipedia suggests you can use higher quality plastic fibre or even glass to extend the range, Pipe. Might be worth investigating...? I looked up TOSLINK.
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Last edited by planetnine; 06-10-2020 at 12:07 AM.
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06-10-2020, 12:05 AM
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#3
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Human being with feelings
Join Date: Jun 2011
Location: Belgium
Posts: 5,246
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I'm running 10 and 15 m ADAT cables on a daily basis with gear from different manufacturers without a problem. Some of the gear is really old, some is new...
The longer cables have a thicker core and a thicker sleeve. Cheap cables, from China, of course.
__________________
In a time of deceit telling the truth is a revolutionary act.
George Orwell
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06-10-2020, 02:32 PM
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#4
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Human being with feelings
Join Date: Jan 2020
Posts: 680
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You should only be 'worried' about mixing your metaphors, pipe! :-)
Ahem, 25 feet is a lot less than 15m !!
Cyrano's response would suggest you will be ok.
If you already have some equipment still and cables try something twice as long as you need...and if that is ok...? Long cables are readily available and cheaply.
5m is tbe advised max distance to be used. That presumably takes into account (I assume) less than perfectly clean fibre ends, maybe the odd kink, and minimum tolerence for jitter at max throughput. ADAT spec is for max of 10m cable according to technical limitations but wonder if that is for plastic rather than glass.
There are reports of equipment working up to 30m but that will no doubt rely on suitable tx/rx interface ICs at the fibre to copper interfaces - that might be better than the original Alesis designs.
Not a very certain tech response I admit but should indicate there is a
probably a lot of tolerence to play with.
Although there are different modes of op and cable types fibre links are generally quite forgiving so give it a try. ....and yet there are those with magic ears who can tell the difference between plastic and glass on even short lengths. I'm just waiting for oxygen free fibre.....or will it be 1" thick fibres. ...
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06-10-2020, 03:33 PM
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#5
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Human being with feelings
Join Date: Jun 2011
Location: Belgium
Posts: 5,246
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Most consumer optical cables are made from waste. Short pieces are easy, as the telecoms and network guys don't need those. It's very long cables that are very expensive.
There are some people on the RME forum doing MADI over several kilometers. That's an expensive cable...
Optical is easy, though. No magnetic or inductive interference whatsoever. Keeping light out is so simple, compared to electrical shielding.
__________________
In a time of deceit telling the truth is a revolutionary act.
George Orwell
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06-10-2020, 07:29 PM
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#6
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Human being with feelings
Join Date: Jan 2020
Posts: 1,927
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Quote:
Originally Posted by cyrano
Optical is easy, though. No magnetic or inductive interference whatsoever. Keeping light out is so simple, compared to electrical shielding.
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Simple, but a lot easier to accidentally break.
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06-11-2020, 12:38 AM
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#7
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Human being with feelings
Join Date: Jun 2011
Location: Belgium
Posts: 5,246
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Yes, these cables need to be treated differently from copper. But hey, they are dirt cheap, compared to copper.
__________________
In a time of deceit telling the truth is a revolutionary act.
George Orwell
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06-11-2020, 06:25 AM
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#8
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Human being with feelings
Join Date: Jan 2020
Posts: 680
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....and beware long cables......rabbits like to chew them! One nibble and snip....
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06-12-2020, 10:54 AM
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#9
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Mortal
Join Date: Jan 2006
Location: Wickenburg, Arizona
Posts: 14,051
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If I could do 40 foot cables, I could actually put the mic pres out in the drum room the way my DL32 is now
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06-12-2020, 02:14 PM
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#10
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Human being with feelings
Join Date: Jun 2011
Location: Belgium
Posts: 5,246
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15 m (45 ft) is readily available and cheap...
Everything longer tends to be a bit harder to find and a lot more expensive. Still doesn't break the bank, compared to analog snakes.
And you could us appsys.ch converters to RJ45 with UTP (ethernet) cable.
https://appsys.ch/en/products/extenders/adx-16
Of course, preamp gain control would be on stage...
__________________
In a time of deceit telling the truth is a revolutionary act.
George Orwell
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06-12-2020, 02:48 PM
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#11
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Human being with feelings
Join Date: Oct 2007
Location: Lincoln, UK
Posts: 7,942
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You need Dante, Pipe... 
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06-13-2020, 10:04 AM
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#12
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Mortal
Join Date: Jan 2006
Location: Wickenburg, Arizona
Posts: 14,051
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Quote:
Originally Posted by planetnine
You need Dante, Pipe...
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I threw that shit in the trash
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06-13-2020, 10:06 AM
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#13
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Mortal
Join Date: Jan 2006
Location: Wickenburg, Arizona
Posts: 14,051
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Quote:
Originally Posted by cyrano
15 m (45 ft) is readily available and cheap...
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It aint the price Im worried about, its the claim that you can't run them more than 15 feet that worries me
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06-14-2020, 03:28 AM
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#14
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Human being with feelings
Join Date: Jan 2020
Posts: 680
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As it's cheap why not just give if a try?
If I may say, you do seem to be going round in circles 🙂
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06-14-2020, 10:05 AM
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#15
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Mortal
Join Date: Jan 2006
Location: Wickenburg, Arizona
Posts: 14,051
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Quote:
Originally Posted by Allybye
As it's cheap why not just give if a try?
If I may say, you do seem to be going round in circles 🙂
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"cheap" and "cheap to get to hawaii" are two different things
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06-19-2020, 11:52 AM
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#16
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Human being with feelings
Join Date: Oct 2007
Location: Lincoln, UK
Posts: 7,942
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Quote:
Originally Posted by pipelineaudio
I threw that shit in the trash
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You not get on with it?
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06-26-2020, 11:13 AM
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#17
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Mortal
Join Date: Jan 2006
Location: Wickenburg, Arizona
Posts: 14,051
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No, it was actually really really cool. But performance wise and options wise it was pretty bad. I can see situations where it would absolutely kick serious ass, just not mine
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