Hi
The difference in Cabling,
LX-LC
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* Either single mode or multimode
* 62.5/125 µm or 50/125 µm (core/cladding) diameter, graded-index, low metal content, multimode fiber optic, complying with ITU-T G.651 and ISO/IEC 793-2 Type A1b or A1a, respectively
* Low metal content, single-mode fiber-optic, complying with ITU-T G.652 and ISO/IEC 793-2 Type B1
Maximum distance: 10 km (single mode) or 550 m (multimode).
LX-LC
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* Low metal content, single-mode fiber-optic, complying with ITU-T G.652 and ISO/IEC 793-2 Type B1
Maximum distance: 70 km
For more information:
http://www.hp.com/rnd/products/switches/switch4100glseries/accessories.htmIf you want to know what do you have in your switch, it depends on the Modules that you have, BUT :
I prefer to use the HP ProCurve Configurator, so you can simulate what do you have and know better about the Option you have:
http://www.hp.com/rnd/configurator.htmDownload this software and you can know easily what exactly do you have.
Don;t forget to assign points.
Good Luck !!!