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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: High Density Multimode Runs BCP?
Just in case some folks are wondering what we are talking about, here's a decent URL covering it: http://images.google.com/imgres?imgurl=http://www.tpub.com/neets/tm/30NVM053 .GIF&imgrefurl=http://www.tpub.com/neets/tm/107-8.htm&h=387&w=397&sz=13&tbni d=gGUI7fKu6OwJ:&tbnh=116&tbnw=119&start=16&prev=/images%3Fq%3Dfiber%2Bribbon %2Bcable%26hl%3Den%26lr%3D%26c2coff%3D1 -- Martin Hannigan (c) 617-388-2663 VeriSign, Inc. (w) 703-948-7018 Network Engineer IV Operations & Infrastructure [email protected] > -----Original Message----- > From: Scott McGrath [mailto:[email protected]] > Sent: Wednesday, January 26, 2005 10:44 PM > To: Hannigan, Martin > Cc: [email protected] > Subject: RE: High Density Multimode Runs BCP? > > > > Hi, Martin > > Yes indeed the ribbon cable. Tho' due to the damage factor I probably > would not specify it again unless I could use innerduct to > protect it as > we had some machine room renovations done and the construction workers > managed to kink the underfloor runs as well as setting off the Halon > system several times... > > > The ribbon cables work well if they are adequately protected. If the > people in the machine room environment are skilled at handling fiber > there should be no problems. If however J. Random Laborer > has access I > would go with conventional armored runs. > > > Scott C. McGrath > > On Wed, 26 Jan 2005, Hannigan, Martin wrote: > > > > > The ribbon cable? > > > > > > > > > > -- > > Martin Hannigan (c) 617-388-2663 > > VeriSign, Inc. (w) 703-948-7018 > > Network Engineer IV Operations & > Infrastructure > > [email protected] > > > > > > > > > -----Original Message----- > > > From: Scott McGrath [mailto:[email protected]] > > > Sent: Wednesday, January 26, 2005 6:44 PM > > > To: Hannigan, Martin > > > Cc: Thor Lancelot Simon; [email protected] > > > Subject: RE: High Density Multimode Runs BCP? > > > > > > > > > > > > Hi, Thor > > > > > > We used it to create zone distribution points throughout our > > > datacenter's > > > which ran back to a central distribution point. This > > > solution has been > > > in place for almost 4 years. We have 10Gb SM ethernet links > > > traversing > > > the datacenter which link to the campus distribution center. > > > > > > The only downsides we have experienced are > > > > > > 1 - Lead time in getting the component parts > > > > > > 2 - easiliy damaged by careless contractors > > > > > > 3 - somewhat higher than normal back reflection > > > on poor terminations > > > > > > Scott C. McGrath > > > > > > On Wed, 26 Jan 2005, Hannigan, Martin wrote: > > > > > > > > > > > > > > > > -----Original Message----- > > > > > From: Thor Lancelot Simon [mailto:[email protected]] > > > > > Sent: Wednesday, January 26, 2005 3:17 PM > > > > > To: Hannigan, Martin; [email protected] > > > > > Subject: Re: High Density Multimode Runs BCP? > > > > > > > > > > > > > > > On Wed, Jan 26, 2005 at 02:49:29PM -0500, Hannigan, > Martin wrote: > > > > > > > > > > > > > > > > When running say 24-pairs of multi-mode across a > > > > > datacenter, I have > > > > > > > > considered a few solutions, but am not sure what is > > > > > > > common/best practice. > > > > > > > > > > > > > > I assume multiplexing up to 10Gb (possibly two links > > > > > thereof) and then > > > > > > > back down is cost-prohibitive? That's probably the > > > > > "best" practice. > > > > > > > > > > > > I think he's talking physical plant. 200m should be > > > fine. Consult > > > > > > your equipment for power levels and support distance. > > > > > > > > > > Sure -- but given the cost of the new physical plant > > > installation he's > > > > > talking about, the fact that he seems to know the present > > > maximum data > > > > > rate for each physical link, and so forth, I think it does > > > > > make sense to > > > > > ask the question "is the right solution to simply be more > > > economical > > > > > with physical plant by multiplexing to a higher data rate"? > > > > > > > > > > I've never used fibre ribbon, as advocated by someone else in > > > > > this thread, > > > > > and that does sound like a very clever space- and > > > possibly cost-saving > > > > > solution to the puzzle. But even so, spending tens of > > > thousands of > > > > > dollars to carry 24 discrete physical links hundreds of > > > > > meters across a > > > > > > > > Tens of thousands? 24 strand x 100' @ $5 = $500. Fusion splice > > > > is $25 per splice per strand including termination. The 100m > > > > patch chords are $100.00. It's cheaper to bundle and splice. > > > > > > > > How much does the mux cost? > > > > > > > > > > > > > datacenter, each at what is, these days, not a > > > particularly high data > > > > > rate, may not be the best choice. There may well be some > > > > > question about > > > > > at which layer it makes sense to aggregate the links -- > > > but to me, the > > > > > question "is it really the best choice of design > > > constraints to take > > > > > aggregation/multiplexing off the table" is a very > > > substantial one here > > > > > and not profitably avoided. > > > > > > > > Fiber ribbon doesn't "fit" in any long distance (+7') > distribution > > > > system, rich or poor, that I'm aware of. Racks, > cabinets, et. al. > > > > are not very conducive to it. The only application I've seen was > > > > IBM fiber channel. > > > > > > > > Datacenters are sometimes permanent facilities and it's better, > > > > IMHO, to make things more permanent with cross connect than > > > > aggregation. It enables you to make your cabinet cabling and > > > > your termination area cabling almost permanent and maintenance > > > > free - as well as giving you test,add, move, and drop. It's more > > > > cable, but less equipment to maintain, support, and reduces > > > > failure points. It enhances security as well. You can't open > > > > the cabinet and just jack something in. You have to provision > > > > behind the locked term area. > > > > > > > > I'd love to hear about a positive experience using ribbon cable > > > > inside a datacenter. > > > > > > > > > > > > > > > > > > Thor > > > > > > > > > > > > > > >
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