What's caused the damage in your experiences? Random failures or big yellow cats?
On Wed, Aug 28, 2024 at 3:58 PM <ch...@go-mtc.com> wrote: > When you are out in the desert tracking direct bury fiber, only handholes > are splice points.... good luck. > If the closest hand hole is 2 miles away from the area of the fault, good > luck. You will wheel it off, read the sequential, then wheel it off again, > dig again. Not find the damage. Then you have the choice to cut and shoot > it again or just start exposing cable. Flip a coin to choose which way to > start digging and start digging. Have dug for hundreds of feed looking for > damage and sometimes it is very hard to see. Sometimes a gopher will just > eat into the side of a cable a little bit. > > You can strip it and have someone put a visible light on it if you are > not too far away for that to work. That can tell you if you are on the CO > side of the fault. There are also those bendy fiber detectors that can > help with that too. Hopefully you find it close enough that you can put a > handhole near where you stripped it. Always takes two handholes or peds > to fix. And LOTS of digging. > > > *From:* castarritt > *Sent:* Wednesday, August 28, 2024 1:49 PM > *To:* AnimalFarm Microwave Users Group > *Subject:* Re: [AFMUG] fiber patch cables > > Shouldn't you be able to look at the distance to fault from the last > splice, look up the cable footage marker going into that splice closure (go > check it if you didn't document that when it was built), check footage > marker at closest handhole, and then wheel it off from there? > > On Wed, Aug 28, 2024 at 2:42 PM <ch...@go-mtc.com> wrote: > >> So on a 15 mile shot with a problem somewhere in the middle, you think >> you can wheel it off and dig it up and find it? >> One shot, from the end. Walk right to the problem? >> >> >> >> *From:* Josh Luthman >> *Sent:* Wednesday, August 28, 2024 1:07 PM >> *To:* AnimalFarm Microwave Users Group >> *Subject:* Re: [AFMUG] fiber patch cables >> >> That hasn't been my experience, but at the same time we're not 25 mile >> shots - it's maybe 15 max. >> >> On Wed, Aug 28, 2024 at 11:43 AM <ch...@go-mtc.com> wrote: >> >>> I also use EXFOs and they will read to the meter, but if you have a >>> fiber cut out 25 miles, I will bet good money that when you dig up the spot >>> where your OTDR says the fault is, you will be off by 100 feet or more if >>> you did not do a test from the nearest splice point. In reality it will be >>> off by thousands of feet. >>> >>> Best Regards, >>> Chuck McCown >>> >>> McCown Technology Corporation >>> 8401 N Commerce Dr >>> Lake Point, Utah 84074 >>> 801-250-9503 Office >>> 435-830-4306 Cell >>> www.mccowntech.com >>> www.microtrench.pro >>> www.terabitnetworks.com >>> >>> *From:* Ryan Ray >>> *Sent:* Tuesday, August 27, 2024 9:58 PM >>> *To:* AnimalFarm Microwave Users Group >>> *Subject:* Re: [AFMUG] fiber patch cables >>> >>> 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 >>> >> ------------------------------ >> -- >> 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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