CISCO Fibre cables OM1 or OM3

Hello

I have 2x CISCO C2960 that need to be connected via a Fibre cable. Which cable should I buy, OM1 or OM3?
Distance is under 100 meters. Fibre GBics are already fitted.

thanks in advance.
hairylotsAsked:
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Zephyr ICTCloud ArchitectCommented:
I'd go for OM3, OM1 is mostly for legacy systems, OM3 is newer and is in that aspect more future-proof... It can also travel longer distances, not that this is an issue in your case.
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hairylotsAuthor Commented:
Is there an issue / signal loss if the core size OM1 62.5um OM3 50um?
I have read that there is loss when going from a OM1 GBic to an OM3 cable.
Note, The GBix interfaces are already fitted.
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hairylotsAuthor Commented:
Also how can I tell what the GBix's are OM1 or OM3, or is this not important?
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Zephyr ICTCloud ArchitectCommented:
There's always a possibility you will loose light when you don't match the connectors with the fibers... As for the connector or GBIC, you should check the model to check its capabilities or properties.
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giltjrCommented:
What is the part number on your GBIC?
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hairylotsAuthor Commented:
Hello giltjr

is the a command I can use on the cli to see gbic part number?
I am not on site to see part.

thanks.
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giltjrCommented:
show interfaces transceiver should work.
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Zephyr ICTCloud ArchitectCommented:
show interfaces transceiver should work.

Yes...

Or:
#show interface ethernet 1/1 transceiver

If you want the detail of a physical interface.
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hairylotsAuthor Commented:
I managed to make it on site and check details on SFP's.

Unit 1:
GLC-SX-MM
30-1301-02
Calss 1
S/N opa12146347
com
LN# 50 7/2001
21CRF1040.10
CNUIAFJAAA

Unit 2:
GLC-SX-MM
30-1301-04
S/N: AGM1615L85R
Class 1
21cfr1040.10
LN#50 7/2001
SFBR-5766PZ-CS2
PAE15079E
CNUIAFJAAA


CLI commands suggested above did not reveal any info on SFP's.
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giltjrCommented:
Actually it does, they are GLC-SX-MM modules.  They are 850nm multimode and support both 62.5 and 50.0 mm core fiber cables.

http://www.cisco.com/en/US/docs/routers/7200/install_and_upgrade/gbic_sfp_modules_install/5067g.html

The info is in table 6.

One of them is newer than the other one.  Unit 1 is revision level 02 (30-1301-02) the other is revision level 04 (30-1301-04).
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hairylotsAuthor Commented:
Hello giltjr

Thanks, appreciated.
So the only real consideration, which cable OM1 or OM3 is now the distance?
OM1 max 220 meters
OM3 max 1500 meters
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giltjrCommented:
And possible future speed increases.  OM1 can do 10 Gbps, but only 33 meters.  OM3 can do 10 Gbps up to 300 meters.
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Zephyr ICTCloud ArchitectCommented:
Besides giltjr's correct info, OM3 is also more future proof, as I mentioned earlier... Maybe you don't need the distance now, but might in the future?
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