nanog mailing list archives
Re: Cost of fiber run between neighbouring office buildings
From: William Herrin <bill () herrin us>
Date: Tue, 2 Oct 2012 13:49:15 -0400
On Tue, Oct 2, 2012 at 9:01 AM, Nick Hilliard <nick () foobar org> wrote:
On 02/10/2012 13:35, Hank Disuko wrote:- 2 x 6-Strand 50/125u multimode, Tight Buffered, Armoured, Laser Ultra-Fox Fiber cables - Distance of run is approx 520 metersFor that length, go with single-mode. 10G-LR will happily run on 10km of SMF, but 10G-SR flakes out at ~300m even on OM3. Laying outdoor MMF plant like this is totally pointless. Using MMF for anything outside your cabinet / small cage is creating a legacy deployment on day 1 which will bite you in future years.
I second what Nick said. Single mode for anything longer than a few meters. *IF* you have existing conduit, consider just buying an AMP Lightcrimp Plus kit, picking up some single mode from ebay and doing it yourself. Each Lightcrimp Plus termination is expensive so you wouldn't want to use it for a large job or a large set of jobs, but they've reduced the difficulty level to about what you're used to for RJ45. You could end up in a break-even situation that leaves you with a tool set for next time. You can also buy pre-terminated fiber assembly with a pulling eye and cable netting at one end for pulling it through the conduit. But you'll probably have to go with new fiber; not much in the way of long preterminated cables show up in the used market. If you don't have conduit already, consider: Conduit requires trenching and repair of surfaces afterwards. Big dollars and God help you if you get an amateur because Home Depot doesn't stock the right pipe. Direct burial is cheaper for single installations but you have to keep paying the whole price if you add to it later. Worse really, because each new installation has to carefully avoid cutting the ones before. Conduit, once installed, can support lots of additional cable. Microduct is a happy medium between the two. It's about as easy to install as direct burial cable and once installed you can both blow new fiber through unused ducts and remove obsolete fiber from existing ducts. Microduct even installs well across roadways with a machine that looks like a four-foot circular saw. They can seal the road overtop with tar instead of having to patch or repave which is a major cost savings. Unlike conduit, microduct really only works for fiber. If you also want to run some copper lines, you can't do it. Regards, Bill Herrin -- William D. Herrin ................ herrin () dirtside com bill () herrin us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004
Current thread:
- Cost of fiber run between neighbouring office buildings Hank Disuko (Oct 02)
- Re: Cost of fiber run between neighbouring office buildings Nick Hilliard (Oct 02)
- Re: Cost of fiber run between neighbouring office buildings Robert E. Seastrom (Oct 02)
- Re: Cost of fiber run between neighbouring office buildings Walter Keen (Oct 02)
- Re: Cost of fiber run between neighbouring office buildings William Herrin (Oct 02)
- Re: Cost of fiber run between neighbouring office buildings Robert E. Seastrom (Oct 02)
- Re: Cost of fiber run between neighbouring office buildings Jay Ashworth (Oct 02)
- <Possible follow-ups>
- Cost of fiber run between neighbouring office buildings Summers, William (Oct 02)
- Re: Cost of fiber run between neighbouring office buildings Nick Hilliard (Oct 02)