4

We have got some old 62.5um single-mode fiber links in our building. Network people told me, that Cisco 10GBASE-LRM with Cisco mode conditioning patch cables works fine on those cables and provides a stable 10GBit link.

Now we need to add a new direct link between servers over the same cable, and were considering Intel cards with Intel transceivers. Apparently 10GBASE-SR should not work over this cable (total link length is over 200m). Do I understand correctly that 10GBASE-LR transceivers should work just fine with these cable infrastructure? Which kind of patch cables should we use, single-mode patch cables, multi-mode patch cables, or mode conditioning patch cables?

abbot
  • 213
  • 1
  • 2
  • 9

1 Answers1

0

LR connections are single mode. You'll need mode conditioning patch cables on both sides but likely a different type than was in use for your LRM (which wants multimode, but with a smaller core).

rnxrx
  • 8,103
  • 3
  • 20
  • 30
  • LR likely won't work at all over this fiber. Needs to be single mode end to end. – Dan Pritts Aug 18 '12 at 21:56
  • http://www.fiberoptics4sale.com/wordpress/mode-conditioning-cable-mode-conditioning-patch-cord-how-to-use-it/ - the application in question can use the cited conditioning cables... this is what they're for. – rnxrx Aug 19 '12 at 01:38
  • Learn something new every day. Mode conditioning cables have other uses, FYI - in particular they are useful with 10GBASE-LRM. It's spec'd to work over 62.5 micron (old style) multimode; but it can go much longer distances over that fiber with the mode conditioning cable. – Dan Pritts Aug 23 '12 at 17:54