The worst part of direct burial is gopher damage. And they will eat it up on 100 places but they may not fail until there is some nearby vibration. They seem to have the ability to eat up the cable but leave the strands intact or just break one or two of them.
Yes, you first have to find the damage and in long rural stretches that can be difficult, more so with direct because you have to dig, cut, test, dig cut test. With duct you just pull on it and see if it moves. OTDRs are not precision measuring devices. Even if they are +-1% accurate, that is 52 feet of uncertainty in a mile. So you shoot both ends and then extrapolate the center of overlap or gap. Pray, dig, cut, test, splice, pray, dig, cuts, test, splice. Repeat until you get there. After some time you will have it bracketed and many times you just replace 1000’ instead of actually finding and fixing the problem. All the while customers are very unhappy. I have had it take a week to fix very long remote troubles like this. From: Colin Stanners Sent: Saturday, December 22, 2018 9:56 AM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] 10 mile fiber We also usually install a second duct on all major routes. Chuck, with your long career, I assume that you've had a few cases where direct burial took a long time/difficulties to fix? Now working in the long-distance/underground industry, doing all the planning and permitting, I've seen our guys pull up things - including a boulder the size of a car - from the ground so that they could get that conduit through. On Sat, Dec 22, 2018 at 10:48 AM Chuck McCown <[email protected]> wrote: I never do direct burial any more. Not even on drops. Generally I install an extra duct, I like duralines future path products if I can justify the expense. I need to learn how to install microduct into regular duct. I am sure I can pull it but I would like to figure out how to blow it. From: Colin Stanners Sent: Saturday, December 22, 2018 9:42 AM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] 10 mile fiber I try hard to steer clear of direct-burying cable, which is much easier to damage and extremely time-consuming to repair, unless it's a non-crucial line (e.g. standard residential customer, although those we currently put in conduit as well, to keep future risk and repair costs low). If this customer is paying 1/4 million to get a line installed, it's probably crucial. One day when that line gets hit, if it's in conduit it's likely possible to get it repaired within hours to a day. I've even heard of cases of the fiber surviving a conduit-line hit since it's "loose" inside the conduit and has slack at the ends. If a direct-buried line gets hit, especially next to a road etc, it may be needed to get locates, arrange a drill, electrical/gas line safety watch, etc, possibly even arrange more permitting for a new vault, which will often move time to repair to days or a week+. On Sat, Dec 22, 2018 at 9:28 AM Chris Fabien <[email protected]> wrote: Steve in our area we could do that "on the cheap" with 12 or 24 count cable direct buried for around 100k. There are so many variables though. You really need someone who has done work in that area and is familiar with permitting costs and requirements. I'd it's so rural that you can plow the bulk of it and you are OK with direct bury you can save a ton of money vs putting it all in duct. Personally I run at least 24 strands on any run that's going "somewhere". Dead end runs can be 12F. On Sat, Dec 22, 2018, 1:46 AM Steve Jones <[email protected] wrote: If a guy wanted to get fiber in the ground, non aerial between two buildings to replace an existing licensed 1.3 gb link. Crosses 3 creek/ditches, 10 rural intersections, 10 rural town blocks. What would be needed? I would guess that duct is the best thing to put it in, innerduct being better. I'd guess 96+ count isn't going to cost any more per strand to put in the duct than 2 (not the cost of the fiber itself) Lots of dark strands and duct space is probably lucrative to have just in case. Slack, handholes, vaults, etc, what would you put in there? 10 or so customers on the path so not a ftth type thing. -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com ------------------------------------------------------------------------------ -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com -------------------------------------------------------------------------------- -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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