From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from MAIL1.WPI.EDU (MAIL1.WPI.EDU [130.215.36.91]) by huchra.bufferbloat.net (Postfix) with ESMTP id 04DE721F282 for ; Thu, 25 Sep 2014 07:53:46 -0700 (PDT) Received: from MAIL1.WPI.EDU (MAIL1.WPI.EDU [130.215.36.91]) by MAIL1.WPI.EDU (8.14.9/8.14.9) with ESMTP id s8PEriEA018977; Thu, 25 Sep 2014 10:53:44 -0400 X-DKIM: Sendmail DKIM Filter v2.8.3 MAIL1.WPI.EDU s8PEriEA018977 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=wpi.edu; s=_dkim; t=1411656824; bh=vxw+y6+yAGR7IbRaiyByUnp6HA2J1WJBPvDeZsqAKSM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Transfer-Encoding:In-Reply-To; b=lTzTmX1E9XChudDvDv7nTCGLGFQ4zJGnn4mq5Atht7D5nYs57uZ8zj/P2mCc4/0/r XnUFwmKnFV/hYGUdUU3IWStJfiYWx08VMXYfphGgRs3Nb4R+LMAdsy4TRt6SM5xqs9 X9nnfUbyjYJFbfI1p194cpSYnBfEr+yq1uwQ47lQ= Received: from MX3.WPI.EDU (mx3.wpi.edu [130.215.36.147]) by MAIL1.WPI.EDU (8.14.9/8.14.9) with ESMTP id s8PEri9f018974; Thu, 25 Sep 2014 10:53:44 -0400 Received: from angus.ind.WPI.EDU (ANGUS.IND.WPI.EDU [130.215.130.21]) by MX3.WPI.EDU (8.14.4/8.14.4) with ESMTP id s8PErhZ1017003; Thu, 25 Sep 2014 10:53:44 -0400 (envelope-from cra@WPI.EDU) Received: from angus.ind.WPI.EDU (localhost [127.0.0.1]) by angus.ind.WPI.EDU (8.14.4/8.14.4) with ESMTP id s8PErhuL004341; Thu, 25 Sep 2014 10:53:43 -0400 Received: (from cra@localhost) by angus.ind.WPI.EDU (8.14.4/8.14.4/Submit) id s8PErgtQ004340; Thu, 25 Sep 2014 10:53:42 -0400 X-Authentication-Warning: angus.ind.WPI.EDU: cra set sender to cra@WPI.EDU using -f Date: Thu, 25 Sep 2014 10:53:42 -0400 From: Chuck Anderson To: Dave Taht Message-ID: <20140925145342.GV15839@angus.ind.WPI.EDU> Mail-Followup-To: Dave Taht , "cerowrt-devel@lists.bufferbloat.net" References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.20 (2009-12-10) Cc: "cerowrt-devel@lists.bufferbloat.net" Subject: Re: [Cerowrt-devel] Fiber to the yurt approved X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 25 Sep 2014 14:54:15 -0000 On Thu, Sep 25, 2014 at 07:06:30AM -0700, Dave Taht wrote: > searching alibaba for new gear is truly an eye-opening experience... > > examples: > > http://www.alibaba.com/product-detail/Atheros-based-router-with-sfp-port_1979360314.html > > http://www.alibaba.com/product-detail/Factory-OEM-Ralink-3052-300M-OpenWrt_1923358888.html > > I am under the impression however, that SFP+ is needed for gig > uplinks. Not that 100Mbit > is bad... No. SFP was originally 1 gigabit (1000 mbit) over fiber only. Now it can be 100/1000 megabit dual-mode copper or fiber or 10/100/1000 megabit tri-mode copper or fiber. SFP+ is 10 gigabit. There are other speeds as well, but those are used for things like Fibre Channel, SONET, ATM, etc. rather than Ethernet. > On Wed, Sep 24, 2014 at 11:12 PM, Joel Wirāmu Pauling wrote: > > Put as many pairs as you can fit into the conduit to leave quite a lot of > > slack (2-5metres) > > The specific question was what form of conduit (earth burial) would be sane? > This would be a ground burial thing where I would be comfortable with > ground buriable ethernet, no conduit (it's a forest), but fiber looks more > fragile. > > > We bury our splitters with ofdm break outs in waterproof boxes every 500m - > > 2km or so for the GPON roll out and blow the Fibre to the premise from the > > split. > > Residences and yurts are spaced about every 3 meters in distinct subsections. > > > Burying splinter boxes prevents vandalism/flooding issues and > > accidents. > > This is a campground in california. Amusingly, a few hours after we started > eagerly discussing digging up the ground, it started pouring rain. I'm going > to put "discuss fiber deployment" into my bag of drought-ending tricks... > > >Con's you have to dig it up every time you want to connect > > another pair into the ofdm. Fibre blower kit is expensive. > > I saw that a fiber blower box was 6k. There seem to be daily rentals > available... > > > Choose your connectors on the ofdm carefully. LC style connectors are the > > norm on SFP(+) optics and isn't angled. This is my personal favorite but > > some dislike it. Is rarely the norm for In premise kit especially for pon. > > > > Angled and unangled SC connectors are norm for PON and CPE Home kit. Angled > > is better for loss and used primarily on the splitter OFDM but easy to munge > > if you connect angled to unangled. Angled (APC - Angled Polish Connector) usually has a green colored connector, while non-angled (PC or UPC - Ultra Polished Connector) usually has a blue connector for singlemode. You can't mate two unlike kinds (well you can try, but the loss will be high). Angled improves the Return Loss figure (larger negative dB value, usually -65 dB vs. -45 dB on regular UPC) due to it preventing reflections at the connector mating point from entering back into the trasmit fiber causing attenuation. Instead it causes the reflections to divert to the side. IME, it is used for PON and HFC networks, or any network that sends a RF modulated signal down the fiber. For straight data-only deployments, usually un-angled is used. Definitely all SFP or SFP+ modules you find will require the regular PC or UPC kind, not angled. > > You might even consider just not using a splinter or OFDM patch at all and > > just having slack and unterminated fibers. Cheap Chinese Fujikura equivalent > > spilcers can be had for around 3000$ now. And splicing is always better than > > patching IME. > > > > Have fun! > > You just hit me with more condensed jargon than I've had to deal with in many > a month, but I think I grokked most of it. It has been really > interesting to absorb > an entirely new technology with your help, that of the list, and google. > > First up is just to trial something between two desparately needed points... Outside Plant (OSP) cable is designed for outdoor use (but not necessarily direct-burial, may still need conduit). There are regulations on how far into a building you can bring OSP cable (50 ft or 50 meters?) due to fire codes. There is also Indoor/Outdoor cable to get around that limitation. Given you are using regular routers or switches, you don't want PON (star arrangement of fiber that passively splits to multiple destinations in the downstream direction, and uses timeslots for the upstream direction, requires special OLT and ONC gear at each end and isn't really regular Ethernet). So you will generally need two strands for each point-to-point link (although there are special bi-directional SFPs you can get that will run TX and RX over a single strand using WDM, not recommended due to higher cost). Do you have a central aggregation point planned? If so, I would home-run all the strands from each peripheral building to that point (or rather, splice separate cables together where necessary so that logically each building has a home run of at LEAST 2 strands, although I would plan on at least 6 or 12 for expansion/redundancy/spares/experimentation). The labor is the expensive part, so pulling as many strands as possible in one go is the best way. You don't have to or splice all of them or terminate all of them onto LC/UPC connectors yet. I can ask what our contractors recommend as far as type of conduit.