MJP@vaxb.roe.ac.uk (11/16/88)
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
orr@helios.toronto.edu (Bob Orr) (11/22/88)
>> 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