Hal Merritt pisze:
Two Issues.
First, I've been tasked to procure the correct cables for a OSA-Express3
(feature code 3370 on a 2098).
The only specification I can find is '9 micron single mode fiber'. I'm having
trouble relating that specification to any verbiage on the cables or their
packaging. Can any one point me to a Rosetta Stone to translate the various
markings?
This sounds an awful lot like a standard long wave FICON cable.
Are these, in fact, one and the same? If so, can someone point me a definitive
IBM source? (This will be a mission critical application and management wants
'works for sure' rather than 'should work').
Second, the specific mission is to interconnect two 2098's. We could use a
switch (but that's a complicated solution) or we could use a 'cross over'
cable. I am thinking that all I have to do is swap the polarity of one end of
the fiber cable and I'm there. Anyone that has actually done this and have it
in high volume production? (Please, no speculation).
In simple words, 9um cable is single-mode fiber, the same as for FICON
LX. You can read about it in sg245444 IBM System z Connectivity
Handbook, especially App. B.
BTW: Things get more complicated when talking about multimode and
(contemporary) big speeds - there *IS* difference between 50um and 62,5
um, and cable "class" (OM1, OM2, OM3, OM4 - see ISO/IEC 11801) is
important. Fortunately, it is NOT your case. You need OS2 SM 9/125 um.
Caution: cable (fiber) is one issue, another one is connector. It can be
SC or LC (or many many more) - all new cards require LC ...but it's not
everything you need to know! It can be LC/AC or LC/PC or subviariants.
Honestly I simply don't remeber those details - the "typical" variant is
the proper one.
Eth connection.
I don't know for sure. I never connected two Eth cards directly (I mean
fiber optic media). However it can work (my divagation, I would try it).
It won't work FOR SURE in case of 1000BaseT (copper media) at 1000Mbps
speed.
BTW: OSA Express3 is ambigous. FC 3370 is unambigous. It is OSA Ex3
10GbE LR. It requires LC cnnectors and 9um single mode fibers.
HTH
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Radoslaw Skorupka
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BRE Bank SA
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Wedug stanu na dzie 16.07.2010 r. kapita zakadowy BRE Banku SA (w caoci wpacony) wynosi 168.248.328 zotych.
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