Long link cables

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2 total messages Started by MJP Wed, 16 Nov 1988 01:43

#2306

Author: MJP
Date: Wed, 16 Nov 1988 01:43

13 lines
1017 bytes

Does anyone have figures on the performance of links implemented over long 
twisted pair link cables (>15m) or fibre-optic links?  There is presumably
a point at which the propagation delay down the cable delays the 
despatching of the acknowledge bits sufficiently that the data transfer 
rate starts to drop.  I've had a look in Rygol & Watson "Connecting Inmos 
Links", but while there are design notes and guidelines, there's nothing 
about hard, bitter experience!  

All and any info gratefully appreciated,

Cheers,
Magnus Paterson,
Royal Observatory, Edinburgh

Re: Long link cables

#2313

Author: Bob Orr
Date: Mon, 21 Nov 1988 22:55

19 lines
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>> concerning long link cables.

My colleague, Wolfgang Voegel ( of Uni Hamburg ), has done some tests
on long link cables. Config is T800 and Parsytec Drivers:

	Cable Length		Transfer Rate
	 (metres)		 ( Mbytes/sec)
	--------		-------------
	0 - 5			> 1.53
	5 - 10			  1.42
	10 - 15			1.32
	15 - 20			1.25
	20 - 25			1.17
	25 - 30			1.11
	30 - 35			1.04
	35 - 40 		1.00	
	40 - 45			0.95
	45 - 50			0.90

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