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Conference smurf::ase

Title:	ase

Moderator:	SMURF::GROSSO

Created:	Thu Jul 29 1993
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	2114
Total number of notes:	7347

2007.0. "BC12N cables for Memory Channel Hubs" by SANITY::PCUMMINGS (The perfect democracy) Fri Apr 18 1997 13:07

    I'm looking for some information on the BC12N-10 Memory Channel Hub
    cables that are used on 2100, 4100, 8400 configurations between
    the system box and the Memory Channel Hubs.
    
    I was told in a TruCluster Configuration and System Management class
    that the cylinders on each BC12N-10 cables were magnets and that these
    need be pushed up so that they are touching the connectors on each of
    the BC12N cable and if they are not, you can wind up with intermittent
    memory channel errors.
    
    Any truth to this? Can someone elaborate on this?
    
    thanx
    /paul

T.R	Title	User	Personal Name	Date	Lines
2007.1	Sounds mythical...	NNTPD::"[email protected]"	Dave Cherkus	`Fri Apr 18 1997 13:58`	19
	It isn't a magnet, it's just a ferrite bead. The first batch of MC cables (prototypes) had no beads. The second had them right up against the connector. The third had them an inch or two away from the connector. This was requested by me and many others because it became impossible to put the cables on due to bulkhead spacing. I remember talking to our favorite MC engineer about this. I think your instructor probably saw the second generation cables and presumed they all had to look that way. The ferrite bead doesn't slide at all on the new cables. I wonder how the instructor is repositioning it. Dave [Posted by WWW Notes gateway]
2007.2	what's its purpose?	SANITY::PCUMMINGS	The perfect democracy	`Fri Apr 18 1997 16:24`	7
	Interesting - guess the instructor was all wet on that one. So what's the purpose of the ferrite bead ? thanx /pc
2007.3	He was partially right...	NNTPD::"[email protected]"	Dave Cherkus	`Mon Apr 21 1997 13:21`	8
	Ferrite beads are used to remove high frequency noise from cabling. In this case I presume it is to remove the noise generated inside the system cabinet (due to several hundred megahertz alphas, among other things) from leaving via the cables. Dave [Posted by WWW Notes gateway]