[Beowulf] experiences with MRJ-21 'telco' connectors and patch panels

Andrew Latham lathama at gmail.com
Wed Dec 28 10:56:44 PST 2005


These typically work well.  I have not used them on a cluster,
although using them on a campus wide network was easy. If you are in
one single structure then everything should work great.  Look for good
patch panels and or prefab panels with your connector of choice on the
back as they all exist.


On 12/28/05, Bruce Allen <ballen at gravity.phys.uwm.edu> wrote:
> For our upcoming NEMO cluster, I would like to buy a Foundry Networks
> switch (RX-16) with 48-port copper GigE cards that use 'mini RJ-21'
> (telco) connectors rather than the more standard RJ-45 ones.
> These MRJ-21 connectors carry the equivalent of six standard CAT5E
> ethernet lines.  So a 48-port card has eight MRJ-21 connectors plugged
> into it.  The 48-port cards are not available with RJ-45 connectors
> because the RJ-45 connectors are physically too large: one can't get 48 of
> them onto the front of the card.
> Since the remainder of our cluster (hosts, edge switches, etc) will use
> standard RJ-45 connectors, we need to use 'patch panels' to convert the
> MRJ-21 to RJ-45.  Does anyone on the list have good or bad experiences
> with such patch panels and with MRJ-21?
> Cheers,
>         Bruce
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Andrew Latham - AKA: LATHAMA (lay-th-ham-eh)
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