6944 compared to 6940

[Ken J Seefried]

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Kevin:

You almost definately don't want a 100BaseT4 card.  T4 is the standard for
running 100Mbps ethernet over old Cat 3 UTP cable using all 4 wire pairs.  The
standard evolved to allow upgrades to places with antiquated wiring facilities
and an unwillingness to pull new cable.  A T4 setup requires both hubs,
switches, routers and/or nics to be T4 compliant.

The "normal" Fast Ethernet for you is likely 100BaseTX (100Mbps over 2 pairs in
a Cat 5 cable).

- Ken








Kevin Williams <williams@emss.co.za> on 04/07/99 12:12:54 PM

Please respond to williams@emss.co.za
                                                                                
                                                                                
                                                                                


                                                              
                                                              
                                                              
 To:      linux-tulip@beowulf.gsfc.nasa.gov                   
                                                              
 cc:      (bcc: Ken J Seefried/XRCG)                          
                                                              
                                                              
                                                              
 Subject: 6944 compared to 6940                               
                                                              








Hello All,

Is there any difference between the use of an ANA-6944 and an ANA-6940
in a Linux Beowulf cluster of four Pentium II's? There is a bit of
networking terminology I am not familiar with - 100BASE-T4 and
100BASE-TX: is one of these standards preferred for single port "normal"
fast ethernet cards?

Currently, I want to use only one four-port card, and later, if the
networking is a bottleneck, buy additional four-ports.

Many thanks for any information,

Kevin Williams

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Dr Kevin Williams, MIEEE
Electromagnetic Software and Systems (EMSS)
Stellenbosch, South Africa  [http://emss.co.za]
Tel/Fax: +27 21 880-1880/+27 21 880-1880/1727
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