Totally missed that last part XD There are two kinds of countries: those that use the metric system and those that have been the moon.
On Wed, Aug 28, 2024 at 8:52 AM Ken Hohhof <khoh...@kwom.com> wrote: > Because he used metric, or because he spelled it metre? > > ---- Original Message ---- > From: "Josh Luthman" > Sent: 8/28/2024 7:40:18 AM > To: "AnimalFarm Microwave Users Group" > Subject: Re: [AFMUG] fiber patch cables > > OK Euro guy...let the American's get the job done. > > On Tue, Aug 27, 2024 at 11:59?PM Ryan Ray <ryan...@gmail.com> wrote: > >> We use EXFO otdr's on some spans that are 160km and we can get it down to >> the metre. >> >> On Tue, Aug 27, 2024 at 7:07?PM Josh Luthman <j...@imaginenetworksllc.com> >> wrote: >> >>> Don't you document where your splices are? If you see your splices >>> every 33k and see it's broken 1 mile from the last splice it should be >>> pretty obvious, no? >>> >>> On Tue, Aug 27, 2024 at 6:26?PM <ch...@go-mtc.com> wrote: >>> >>>> Magical device called a fusion splicer. Our reels were typically >>>> 33,000’ >>>> >>>> >>>> *From:* Josh Luthman >>>> *Sent:* Tuesday, August 27, 2024 3:51 PM >>>> *To:* AnimalFarm Microwave Users Group >>>> *Subject:* Re: [AFMUG] fiber patch cables >>>> >>>> I don't see how you have a 50 mile span. Even if you get 80k reels >>>> that's 15 miles. >>>> >>>> On Tue, Aug 27, 2024 at 5:19?PM <ch...@go-mtc.com> wrote: >>>> >>>>> When you have spans up to 50-75 miles at times, you have to use longer >>>>> high power pulses. There is a lot of variability in velocity of >>>>> propagation, earth temperature, splice slack loops, fiber twist. 1 mile >>>>> error over 50 miles is only 2%. You can easily be off by several thousand >>>>> feet. You can’t just go dig. You have to go to the closest splice point >>>>> and test again, even then if you it show the fault 2000 feet away and you >>>>> dig at 2000 feet you may be off by 20 feet or more. I have been doing >>>>> this >>>>> for decades. Takes lots of digging to actually find it. >>>>> >>>>> *From:* Josh Luthman >>>>> *Sent:* Tuesday, August 27, 2024 3:01 PM >>>>> *To:* AnimalFarm Microwave Users Group >>>>> *Subject:* Re: [AFMUG] fiber patch cables >>>>> >>>>> A mile?! IDK how that's possible. Every time we turn a new splitter >>>>> on the sequentials and OTDR are within a few feet - we lose a couple of >>>>> feet in butt splices and our sequentials end up wrong. Every new reel >>>>> gets >>>>> tested on delivery and it's right on. >>>>> >>>>> When we had a broken fiber (ants) it was right on the case. When we >>>>> had a broken fiber (ribbon got knicked with installation) it was between >>>>> two cases. >>>>> >>>>> On Tue, Aug 27, 2024 at 3:48?PM <ch...@go-mtc.com> wrote: >>>>> >>>>>> Wow, sometimes looking for gopher damager over 20 miles I have been >>>>>> off a mile. >>>>>> >>>>>> >>>>>> >>>>>> *From:* Josh Luthman >>>>>> *Sent:* Tuesday, August 27, 2024 1:30 PM >>>>>> *To:* AnimalFarm Microwave Users Group >>>>>> *Subject:* Re: [AFMUG] fiber patch cables >>>>>> >>>>>> So far every time we've used the OTDR it's been accurate within 1 >>>>>> foot. >>>>>> >>>>>> On Tue, Aug 27, 2024 at 12:55?PM Trey Scarborough <t...@3dsc.co> >>>>>> wrote: >>>>>> >>>>>>> The only thing you have to worry about with shorter cables is the >>>>>>> reflection. In some instances with dirty connector at just the right >>>>>>> connector you can get reflection back in to the transmitter that can >>>>>>> cause >>>>>>> errors, the tx to shut down or premature failure. This is very uncommon >>>>>>> with LR 10G and less optics and can be prevented from making sure you >>>>>>> have >>>>>>> clean connectors. Check the RX and TX levels and make sure you don't >>>>>>> have >>>>>>> excessive loss. With 100G its a little different story due to the >>>>>>> combined >>>>>>> power of multiple channels, but still can be prevented by cleaning >>>>>>> connectors, but in some instances Ive had to use attenuation when mixing >>>>>>> different vendor optics. >>>>>>> >>>>>>> The using no launch on an OTDR most automatically calibrating OTDRs >>>>>>> will work without one. Your results can be off though. Most of the lower >>>>>>> cost ones are also lower powered and have less of an RX sensitivity so >>>>>>> they >>>>>>> don't suffer as much from the reflections interfering when testing. I >>>>>>> can >>>>>>> test all day long with my little otdrs without one, but my long range >>>>>>> 200k+ >>>>>>> units I have to have a minimum of a 1k spool on it or you see ghosts. >>>>>>> They >>>>>>> will show up as repeating events at even intervals. Not something you >>>>>>> will >>>>>>> see on shorter runs either. >>>>>>> >>>>>>> >>>>>>> On 8/26/24 4:31 PM, Ken Hohhof wrote: >>>>>>> >>>>>>> I should note that apparently I used to do this with direct attach >>>>>>> cables (DAC) but I think that was a pain, one more thing to stock and to >>>>>>> bring with for projects. Whereas I’d always have boxes full of SFPs and >>>>>>> fiber patch cords. >>>>>>> >>>>>>> >>>>>>> >>>>>>> *From:* AF mailto:af-boun...@af.afmug.com *On Behalf Of *Josh >>>>>>> Luthman >>>>>>> *Sent:* Monday, August 26, 2024 4:20 PM >>>>>>> *To:* AnimalFarm Microwave Users Group mailto:af@af.afmug.com >>>>>>> *Subject:* Re: [AFMUG] fiber patch cables >>>>>>> >>>>>>> >>>>>>> >>>>>>> People say you need a launch cable but our cheap china OTDRs have no >>>>>>> issues seeing the connector at the end of the patch cable and stuff >>>>>>> beyond. I bought a big launch cable back in the day and never use it >>>>>>> anymore. >>>>>>> >>>>>>> >>>>>>> >>>>>>> Might be different with AE? >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Mon, Aug 26, 2024 at 5:16?PM <ch...@go-mtc.com> wrote: >>>>>>> >>>>>>> Only minimum length I know of is the OTDR dead zone. If that is a >>>>>>> problem you purposely lengthen the cable with a launch cable. >>>>>>> >>>>>>> >>>>>>> >>>>>>> *From:* Josh Luthman >>>>>>> >>>>>>> *Sent:* Monday, August 26, 2024 1:59 PM >>>>>>> >>>>>>> *To:* AnimalFarm Microwave Users Group >>>>>>> >>>>>>> *Subject:* Re: [AFMUG] fiber patch cables >>>>>>> >>>>>>> >>>>>>> >>>>>>> Reddit is wrong. Gasp. >>>>>>> >>>>>>> >>>>>>> >>>>>>> Connectors are loss, there is more loss in either one of the >>>>>>> connectors than there is the single mode glass. >>>>>>> >>>>>>> >>>>>>> >>>>>>> Between a switch/router in a rack what I see all the time is long >>>>>>> (like 5/10/15 feet) cables and then put the slack in a loop along the >>>>>>> posts. >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Mon, Aug 26, 2024 at 1:19?PM TJ Trout <t...@voltbb.com> wrote: >>>>>>> >>>>>>> Patchbox makes some great products, their fiber system is pretty >>>>>>> slick but expensive. >>>>>>> >>>>>>> >>>>>>> >>>>>>> Cable length is irrelevant it's optical budget / Rx signal strength. >>>>>>> Normally on 2-20k LR optics you are ok with any length cable, 40km+ >>>>>>> needs a >>>>>>> pad on short spans. (Attenuator) >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Mon, Aug 26, 2024, 8:29?AM Ken Hohhof <khoh...@kwom.com> wrote: >>>>>>> >>>>>>> Is there a minimum length for a single mode fiber patch cable? >>>>>>> >>>>>>> >>>>>>> >>>>>>> I have been using 1 meter cables and they are almost always too >>>>>>> long, I’m talking about going between routers and switches in a rack, >>>>>>> stuff >>>>>>> like that. I see that FS sells 0.5 meter cables, but I saw somewhere >>>>>>> like >>>>>>> maybe on Reddit someone claiming there was a minimum length. Given SM >>>>>>> fiber and LR optics, I don’t see how 0.5 or 1.0 meter would be different >>>>>>> they are both essentially zero length. >>>>>>> >>>>>>> >>>>>>> >>>>>>> Probably there’s some kind of cable tray or cable management >>>>>>> solution I could be using but I’ve never liked such things. >>>>>>> >>>>>>> -- >>>>>>> AF mailing list >>>>>>> AF@af.afmug.com >>>>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>>>> >>>>>>> -- >>>>>>> AF mailing list >>>>>>> AF@af.afmug.com >>>>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>>>> >>>>>>> ------------------------------ >>>>>>> >>>>>>> -- >>>>>>> AF mailing list >>>>>>> AF@af.afmug.com >>>>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>>>> >>>>>>> -- >>>>>>> AF mailing list >>>>>>> AF@af.afmug.com >>>>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> AF mailing list >>>>>>> AF@af.afmug.com >>>>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>>>> >>>>>> ------------------------------ >>>>>> -- >>>>>> AF mailing list >>>>>> AF@af.afmug.com >>>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>>> -- >>>>>> AF mailing list >>>>>> AF@af.afmug.com >>>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>>> >>>>> ------------------------------ >>>>> -- >>>>> AF mailing list >>>>> AF@af.afmug.com >>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>> -- >>>>> AF mailing list >>>>> AF@af.afmug.com >>>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>>> >>>> ------------------------------ >>>> -- >>>> AF mailing list >>>> AF@af.afmug.com >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> >>>> -- >>>> AF mailing list >>>> AF@af.afmug.com >>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>>> >>> -- >>> AF mailing list >>> AF@af.afmug.com >>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >>> >> -- >> AF mailing list >> AF@af.afmug.com >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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