Inside plant 10G fiber specs?

Wed Mar 17 04:16:28 UTC 2010

   re: "The grief caused over the long run by having more installed MMF
   plant, especially as you try to move to 10G speeds and beyond, is IMHO
   not worth the relatively small short term cost optimization."
   A good point, which becomes particularly germane moving forward.
   According to a TIA presentation I attended today, a 40G link will
   require eight (8) strands of 8MMF. And the way things look now, a
   100Gbps link will require twenty (20) strands of MMF. Neither is likely
   to reach beyond 100 to 150 meters max.  A single pair of SMF will
   suffice for both and cover eminently greater distances. Until now the
   tradeoffs have been a no-brainer, favoring MMF. But as the number of
   strands begin to add bulk and handling issues and the price points
   continue to fall for SMF at 10G and above, it will become more trying
   to decide.

   Incidentally, there's a couple of good pieces in the March 2010  issue
   of Lightwave Mag on the subject of falling prices of Photonic
   Integrated Circuits (PICs) at 10G and above, and one on advancements
   being made in Planar chips as well on pp 6 and 24, respectively,' here:

   [1]http://online.qmags.com/LW0310/Default.aspx?sessionID=43F4572DBED1C1
   526DB2E9CBB&cid=218039&eid=14800#pg1

   Frank

   --- ras at e-gerbil.net wrote:
   From: Richard A Steenbergen <ras at e-gerbil.net>
   To: Jeff Kell <Jeff-Kell at utc.edu>
   Cc: nanog at nanog.org
   Subject: Re: RE: Inside plant 10G fiber specs?
   Date: Tue, 16 Mar 2010 00:39:39 -0500
   On Mon, Mar 15, 2010 at 10:15:51PM -0400, Jeff Kell wrote:
   > And a follow-up to my original question...
   >
   > I'm reading the Cisco SFP GBIC-SH spec for 50u OM3 and it shows a
   > rating of 1000m?  Really?  That's better than the LH rating over the
   > same fiber (550m)?
   Hi Jeff,
   I don't know of any optics with a 1km reach over MMF at either 1G or
   10G
   rates. Over OM3 fiber you can get ~260-300 meters of 10G, over older
   MMF
   you can potentially get much less, it depends on the exact signal
   you're
   trying to pass. Yes you can get 550 meters with 1G LX over MMF, but the
   MMF itself is ultimately what is limiting you. I recently did a NANOG
   presentation on some of this, you may want to take a look at:
   http://www.nanog.org/meetings/nanog48/presentations/Sunday/RAS_opticaln
   et_N48.pdf
   Personally my take on this particular problem is to stop doing MMF runs
   and standardize on SMF where possible. If you do any amount of shopping
   at all you can find optics for SMF which are barely any more expensive
   than optics for MMF, especially if you're only talking about 1GE or 10G
   SFP+. The grief caused over the long run by having more installed MMF
   plant, especially as you try to move to 10G speeds and beyond, is IMHO
   not worth the relatively small short term cost optimization.
   --
   Richard A Steenbergen <ras at e-gerbil.net>
   http://www.e-gerbil.net/ras
   GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1
   2CBC)

References

   1. http://online.qmags.com/LW0310/Default.aspx?sessionID=43F4572DBED1C1526DB2E9CBB&cid=218039&eid=14800#pg1