|Re: Datacomm infrastructure RESPONSES||<– Date –> <– Thread –>|
|From: Michael McIntyre (aragonumich.edu)|
|Date: Thu, 29 May 1997 21:53:37 -0500|
Here is a much belated summary of response to my post of 20 Feb. More to follow on AACoho's status. Cheers, Michael ________________________________________________________________ Michael McIntyre Ann Arbor Cohousing Community 313-998-7140 www.ic.org/aacoho/ aacoho-info [at] umich.edu Original: > Ann Arbor cohousing is gearing up for construction and I'm > interested in what others experiences have been and are regarding > installing data communication infrastructure around the community > buildings and homes. > > Dedicated conduit? What size? How many lines per unit and what > class cable? Do you have your own LAN with hardwired Internet > access? If you are retrofitting some of this, what would you have > done differently from the start of construction? What should we > absolutely do now? Responses and a few other bit: Date: Thu, 20 Feb 1997 17:04:16 +0500 From: Jerry Callen <jcallen [at] torrent.com> To: aacoho-cis [at] umich.edu Subject: Re: Datacomm infrastructure My background: I'm a computer geek who recently renovated a house and installed network and phone wiring to every room. Absolutely do now: put plenty of wire into the walls of the individually units. You only have the walls open once (unless you are REALLY unlucky...), so get everything you MIGHT ever want into them NOW. You want "Category 5 Twisted Pair" (universally referred to as "cat 5") in a star configuration (known to electricians as "home runs") between every room that might ever contain a computer and a central wiring closet. Cat 5 cable contains 4 distinct pairs. Typical network usage requires only 2 pairs; the remainder are for expansion and backups (typically 5% of the installed pairs are bad). DO NOT use those "unused" pairs for anything else (you'll be tempted to use them for telephone lines); you will have bad pairs at some point and you'll be reallyreally sorry if you don't have spares. Telephone wiring is a bit more discretionary; personally, since wire is cheap and ripping into walls is not, I'd simply install an additional cat 5 cable to every room, again in a star configuration. This gives you complete flexibility regarding what phone lines go to which rooms. Don't get talked into daisy chaining ANYTHING. The electrician may try to tell you that you're crazy to do all those home runs. Do it anyway. Cat 5 wire is cheap, less than $.20/foot. Unless you have huge units, you'll probably use less than 1000' per unit (one small spool), so the cost of the wire is maybe $200. You don't have to install jacks everywhere initially; good jacks are pricey (do NOT get cheap jacks...), and installing them is time consuming. Given the proper tools (meaning, primarily, a "punch down tool", a screwdriver and a good wire set of wire stripper/clippers), installation is easy, just time consuming, so this is a good place to put in some sweat equity. LABEL EVERYTHING! The electrician you use should be familiar with installing data cable. It's not all that critical, but you should try to cross AC lines at a 45 degree angle, keep parallel AC lines at least a foot from data cables, be CAREFUL with staples and other fasteners, and, if possible, have the data and phone cables go in last, AFTER all the plumbing and other electrical work is done (less chance the wires will get dinged). Of course, everything else wants to be last, too, for the same reason. :-) You maybe given a choice between using "66 blocks" or "110 blocks" in the wiring closet; 110 is more modern and easier to work with (given a punch down tool), but electricians and phone installers tend to be more familiar with 66 blocks. Go with the 110s. You don't have to actually connect all the wires to the punch down blocks right away (you can do it as you actually need the jacks), but make SURE that everything is well labeled or you'll have a helluva time later trying to sort out what goes where. Have an AC outlet in the wiring closet, on its own circuit breaker. 10 amps is plenty. DON'T put anything else on that circuit; it's for your network hub, your intercom system, and (if you're a fanatic) the file server. Make sure there's room in the wiring closet for a small hub, the punch down blocks, and YOU ('cuz at some point you'll have to rewire things, and you don't want to have to stand on your head to do it). Did I mention that you should label everything? I don't really know what to use between the units and common house, but being a belt & suspenders kind of guy, I'd be inclined to put in a separate conduit for datacom. Local code will likely require this anyway. By using conduit, you don't have to put all the wire in place now, you can pull it later. Have fun, and don't forget to label things. ++++ http://www.newview.org/network.htm Network Wiring by Jim Salem I specified a number of combined telephone and network connections on my house plans. About half of the telephone connections had matching network connections included. I decided to use category 5 UTP for both telephone and network wiring. A single category 5 wire allows up to 4 telephone connections, two 10 Base T connections or a single 100 base T connection. It addition it could always be used for intercom wiring, etc. All cables should be run from the junction box to the utility panel in the basement. This is known as a "home run". This gives the most flexibility and is appropriate for the star layout of 10-base-T networks. I will be supplying and wiring the wall plates myself. Here are the instructions I wrote for the wiring contractor. Wiring Notes Telephone and Network Wiring All phone and network wiring should be Category 5 unshielded twisted pair (UTP) cables. Each of these cables consists of 4 twisted pairs (8 wires total). Two such cables should be run from the basement to each junction box marked telephone "+ Net". Each telephone-only junction box should have a single such cable installed. All telephone and telephone + Net junction boxes should have blank wall plates installed. The cable ends should be left unattached inside the junction box with approximately 4-6" available for later wiring. The following guidelines should be followed when installing the cables: All cable runs are "home runs" Avoid kinks and tight turns with the cable. Do not run cables through the same holes or parallel to power wiring (within 6"). If you must cross over power wiring, cross at a perpendicular angle. Cable Television Wiring All cable television wiring should be RG-6. All runs should be home runs to the utility panel in the basement. General Information on Home Wiring I used the following sources to develop my house wiring specifications. http://www.hometeam.com (home of Electronic House magazine and lots of useful information) http://www.cogentdata.com/white/fastw.html (In-depth discussion of UTP wiring) http://www.mcdata.com/~meh0045/homewire/wire_guide.html news:comp.home.automation You may find the following distributors helpful: Allwire, Inc. in Denver (303-295-0106) Home Automation Systems, Inc. (http://www.techmall.com/smarthome) ++++ Date: Wed, 16 Apr 1997 23:35:51 -0500 From: Dave McComb <mkumba [at] greyrock.org> Subject: Re: Cohousing and the information age (fwd) I don't remember the exact run lengths, but it is fairly restrictive. We have a fairly small campus and were able to just make it work within the restrictions. The two main restrictions are that no node can have more than 3 ( I think) hubs between itself and the server, and then there is the specific hub to hub distance restrictions. We have a guy in the community who does this stuff for a living and worked out the details. One of the cooler aspects of our network topology was that we have 11 buildings (duplexes, triplexes and quadplexes) plus a common house. We have a hub in each building and when the buildings were built people had the option of prewiring for the LAN. It was an extra $25 per wall jack, so we put one whereever we had a phone jack. What this means is that you are on a subnet with the people in your building and then the buildings are hierachically connected to form the community net (still a LAN) >> 4) Besides ISDN or T1 coming in / going out, is there anything else that >> can be considered? There are a couple of others that will come up, and I'd recommend your avoiding them: The first is cable modems, there has been a lot of talk, and a few trials attempting to get a network to run off the TV cables that are already in the ground. The cables have plenty of capacity, that isn't the problem. The problem is the cable companies have used up all the available channels on that cable with simultaneous broadcast of 100 channels of video. Furthermore their switches are not really switches, they are broadcasters that broadcast over cable instead of the airwaves and that is a lot of capital equipment to get swapped out before any of this will work. I've spoken to the head of the local cabel franchise and to some people in the know about some of these cabel modem trials, and they are a long way from imminent rollout. So I'm not holding my breath waiting for cable modems to save us. The other one that will come up is the satellite down link with telephone uplink. This configuration is borne of the beleif that Internet use is mostly downloading with little upload, so the upload and download channels need not be symetrical. (This is a variation on the model that sees the internet as an entertainment medium where we'll get our videos on the download and be doing channel changing on the upload). Firstly, I haven't heard any credible success stories on this, and even if I had it runs counter to some of my expectations of the use of the internet. I think that as the internet matures a bit more, and as we start to get more work at home types here is our community, I think its very conceivable that we will be uploading (to other people) as much traffic as we are downloading. We ended up going with ISDN, mostly because the community wasn't ready to bite off that next chunk. As it turns out there isn't nearly as much cost difference between the two, maybe there will be an upgrade in our future. Right now our main objective is to get enough people on the ISDN system to recoup the costs we have already incurred and are incurring on an ongoing rate, before we can look at an upgrade. When the time comes the decision will be pretty obvious. Two other things to consider: in this part of Colorado getting an ISDN line takes a long time. They will promise you 30 days from the day you order, and it will take on average 6 months, so get your order in early and expedite it regularly. The other thing is ask around to see if there is a co-op in your broader community, we have one here, where a number of business got together to share a T1 connection, Greyrock is tied into the that coop, and one of the nice things is there is much less competition for the bandwidth during the evening when we use it the most. --------------------- Dave McComb Community Member At Large Greyrock Commons, Fort Collins, CO ++++ Date: Thu, 17 Apr 1997 11:38:15 -0500 From: Scott Cowley <scowley [at] alexandria.lib.utah.edu> Subject: Re: COHOUSING-L digest 130 Paul, Here is what I (think I) know about a datacom system for a cohousing community: - Put in ducts during construction to avoid dirt disruption later. Also, thread a 1/4" polypropylene twine through it as the sections of PVC duct are being glued together. - Use a LAN "star" layout emanating from the common house mechanical room. - You can start with "category 5" twisted pair copper wire which promises to support fairly high data rates for a while, with lower-priced transceivers at the ends. Or you could put in fiber optic mains and go to copper at the homes, or you could go fiber optic all the way to the P.C.s at the desk! - In the case of fiber optic, The more fibers the better. - a 64-fiber optic cable is about 1.25 inches in diameter. A 36-fiber cable is about .75 inch in diamter. Two wires (for a home) total about .25 inch in diameter. - Optical fiber cable requires a bending radius, on turns, of 15 times the diameter. - "Multi-mode" optical fiber is o.k. for 300 yard runs. It is cheap (84 cents/ft) and can also be directly buried (not advisable). "Single Mode" is better, but more expensive. - A new "Gigabit" Ethernet standard is out which will require optical fiber. Only one hub (switch) can be put in such a run. Also pretty intriguing is the ATM protocol. See "Telecommunications", March 1997, pg. 31, for a discussion of both. - Optical fiber signals can be changed to "10BaseT" (twisted pair), category 5 wire signals with transceivers (modems). These cost about $275 per end, but are falling in price. - Optical fiber is not hard to install. It can be pulled with a piece of 1/4" polypropylene twine, or actually blown in with compressed air. Testing it is also pretty easy. To splice it, however, requires special equipment, but is easily do-able. - THE local TV Cable company is claiming to be able to provide digital internet service by the end of this year. - Also on the horizon (2000) is digital communication via satellites. Gates and a cable guy have ganged up to monopolize this, too (-opinion). - Optical fiber has the capacity to support video links, as well as an audio link, and a data link using existing special modems. However, all this requires more money at the ends. - I don't know much about multi-platform o.s.s, but I know that even the older (used) versions of Novell (2.15, 3.1) supported apples. Also check out Novell Lite and Lantastic. - Here's a couple of good URLs, one for cable, one for a modem company: http://www.occfiber.com/bselect.html http://www.pacificnet.net/fiberoptics/ -the newsgroup, "science.optics.fiber" seems to be a pretty good resource. - A server doesn't require a lot of cpu speed. You could probably put together one for under $800. Then just add disk space and better ethernet cards or modems. ++++ Date: Thu, 17 Apr 1997 11:38:15 -0500 From: Scott Cowley <scowley [at] alexandria.lib.utah.edu> Subject: Re: COHOUSING-L digest 130 Paul, Here is what I (think I) know about a datacom system for a cohousing community: - Put in ducts during construction to avoid dirt disruption later. Also, thread a 1/4" polypropylene twine through it as the sections of PVC duct are being glued together. - Use a LAN "star" layout emanating from the common house mechanical room. - You can start with "category 5" twisted pair copper wire which promises to support fairly high data rates for a while, with lower-priced transceivers at the ends. Or you could put in fiber optic mains and go to copper at the homes, or you could go fiber optic all the way to the P.C.s at the desk! - In the case of fiber optic, The more fibers the better. - a 64-fiber optic cable is about 1.25 inches in diameter. A 36-fiber cable is about .75 inch in diamter. Two wires (for a home) total about .25 inch in diameter. - Optical fiber cable requires a bending radius, on turns, of 15 times the diameter. - "Multi-mode" optical fiber is o.k. for 300 yard runs. It is cheap (84 cents/ft) and can also be directly buried (not advisable). "Single Mode" is better, but more expensive. - A new "Gigabit" Ethernet standard is out which will require optical fiber. Only one hub (switch) can be put in such a run. Also pretty intriguing is the ATM protocol. See "Telecommunications", March 1997, pg. 31, for a discussion of both. - Optical fiber signals can be changed to "10BaseT" (twisted pair), category 5 wire signals with transceivers (modems). These cost about $275 per end, but are falling in price. - Optical fiber is not hard to install. It can be pulled with a piece of 1/4" polypropylene twine, or actually blown in with compressed air. Testing it is also pretty easy. To splice it, however, requires special equipment, but is easily do-able. - THE local TV Cable company is claiming to be able to provide digital internet service by the end of this year. - Also on the horizon (2000) is digital communication via satellites. Gates and a cable guy have ganged up to monopolize this, too (-opinion). - Optical fiber has the capacity to support video links, as well as an audio link, and a data link using existing special modems. However, all this requires more money at the ends. - I don't know much about multi-platform o.s.s, but I know that even the older (used) versions of Novell (2.15, 3.1) supported apples. Also check out Novell Lite and Lantastic. - Here's a couple of good URLs, one for cable, one for a modem company: http://www.occfiber.com/bselect.html http://www.pacificnet.net/fiberoptics/ -the newsgroup, "science.optics.fiber" seems to be a pretty good resource. - A server doesn't require a lot of cpu speed. You could probably put together one for under $800. Then just add disk space and better ethernet cards or modems. ++++ Date: Thu, 20 Feb 1997 14:29:38 -0800 From: Dave Buchanan <dbuchanan [at] extremenetworks.com> To: "'aragon [at] umich.edu'" <aragon [at] umich.edu> Subject: RE: Datacomm infrastructure As one in midst of computer networking, I urge you to install "Cat Five" UTP (that's Category 5 Unshielded Twisted Pair) line to each residence, no more than 90 meters or so per run. These could be "home run" to the Common House, where you could presumeably put a hub or switch with a hig-bandwidth connection to the internet. The Cat 5 allows each family to install a 10/100 NIC (Network Interface Card) in their PC. Such NICs are now $99 for name brand (3Com or Intel). Once this is done, your wiring and systems are set up to go either 10 Mbits/sec (traditional 10BaseT Ethernet) or 100 Mbits/sec (Fast Ethernet). You can initially buy an inexpensive 10BaseT hub for the Common House and upgrade later for ten times the speed within the community (and not have to touch the wiring or everyone's systems in their homes). When you plug in the faster switch or hub someday, the home systems will all autosense the higher speed and automagically switch to the 100 Mbits/sec speed. If possible, I would run the wire in conduit with a pull-string alongside it. ++++ From: INTERNET:BlairDrums [at] aol.com, INTERNET:BlairDrums [at] aol.com DATE: 1/11/97 11:42 AM RE: Re: Need help on phone/LAN cable spec To "futureproof" your community (from a tech perspective) I recommend that each telephone wall plate, TV jack and doorbell should receive a separate feed of Cat 5 cable, run (in hub and spoke fashion) from a central distribution point. Depending on the TV habit/policy of the group, you may also benefit from upgrading your video wiring. TV/cable jacks in most homes use a single RG-59 coaxial cable. RG-6 coaxial cable, however, is better at delivering digitally compressed video (for example, from DSS -- small sattellite dishes). If you do two runs to each room you'll also open up the possiblity of distributing video around the house -- baby monitors, child play areas, watching the video feed in more than one room. The classic question, of course: "Does being wired help build community?" If the community answers yes, you might consider a Macintosh server instead of Windows NT -- much faster to set-up, easier to maintain, compatible with Windows machines, and plenty powerful. I'm sending more details on the NT/Mac server comparison directly to Rich. Good luck, Blair Hornbuckle Cohousing of the Genesee Valley Rochester, NY ++++ Date: Mon, 24 Feb 1997 16:49:22 -0700 From: Dave McComb <mkumba [at] fpi.com> To: aragon [at] umich.edu, aacoho-cis [at] umich.edu Subject: [Fwd: Datacomm infrastructure] Michael, First, planning this kind of network is pretty tricky, due to limitations on length of cable, and number of hops through routers that you can make, The geometry of our complex was such that we have a subnet in each building (they are all duplex, triplex and fourplexes) and a hierarchical interconnection between the 12 buildings. (We have yet to go live with this but they tell me it will all work) While we were under construction, we buried PVC conduit with CAT 5 cable in it, with long lengths hanging out the ends. The idea being that when the buildings were complete we could wire the 30 or 40 ft without splicing. We even managed to get the phone company to leave their trench open for a few extra hours for us to get our stuff in the ground. So we had essentially no trenching cost. We were pretty proud of ourselves and let a local paper do a story on us. Within 2 days some vandals had clipped all the exposed wire. We left the PVC in the ground and when construction was nearly done pulled new cable through. We have just (within the last couple of days) gotten our ISDN connection, after six months wait!! so sometime this week we should finally be end to end. It is a dedicated full time 128K connection through a local internet co-op, so we'll be up all the time. Dave McComb Feel free to ask any other questions, I may or may not know the answers, but I can usually get back pretty quickly. ++++ Date: Thu, 20 Feb 1997 21:33:46 -0700 From: Wilhelmus Schreurs <willie [at] webaccess.net> To: aacoho-cis [at] umich.edu Subject: Re: Datacomm infrastructure I've forwarded your message to someone who was closer to the technical details of our LAN at Greyrock, but I'll have a shot at the few things I know. We put conduit and cable in the ground early, using the same trench (I believe) as the phone wiring. If you can negotiate this, I think it's a good idea -- cheap to do and can save a lot of retrofit hassle later. Each building (duplex thru fourplex, and the common house) has a hub. Each family or individual made their own decision about how many outlets to have and where to locate them. We will very soon have our own LAN; it's been slowly coming together -- the server's been bought, we have our own domain name reserved (greyrock.org), and we even have an ISDN line now (*that* took a while!). No T1 line (cost was too high for now). -- /\ Willie Schreurs /\ //\\ <willie [at] WebAccess.net> or //\\ ///\\\ <willie [at] FortNet.org> or <WSchreurs [at] compuserve.com> ///\\\ ////\\\\ Greyrock Commons, Fort Collins, CO ////\\\\ ++++ Date: Fri, 21 Feb 1997 08:45:32 -0400 From: Jim_Snyder-Grant/CAM/Lotus [at] lotus.com To: aragon [at] umich.edu Subject: Wiring At New View (Acton MA), we learned relatively late in the game that none of the utilities would allow us to piggyback our cables into their conduits. So, the key thing for us was to spend a few thousand getting conduit from each house to the common house site, sharing conduit where reasonable. We haven't put the wiring in yet, and the distances involved present some challenge. A few of the households put in category 5 wiring in place of the internal phone wiring, so that they could do internal networking, but it is unclear if it would be OK to stretch Cat-5 wiring all the way for the most distant house to the common house without expensive repeaters. SO maybe we will end up with fibre, which is cheap per linear foot, but expensive to terminate.. We will need to finish the common house, and catch our financial breath before we take more steps. But the conduits (parts & l;abor) were only about 4000, so we did get to do that. Jim_Snyder-Grant [at] NewView.org ++++ Date: Fri, 21 Feb 1997 10:34:24 -0600 (CST) From: Tom Nelson Scott <veda [at] csd.uwm.edu> To: aacoho-cis [at] umich.edu Subject: Re: Datacomm infrastructure The issue of telecom infrastructure in coho/ecovillage developments is dear to me. Check out my web page, point number four. I established a telecom company in Iowa that is carrying high-cap T1/DS1 lines to commercial customers on fiber. That's the medium I'd suggest. But you also have to deal the present: Because of the high expense of electronics to get the signals in/out of the fiber, you will have to do some of your current infrastructure in metallic media (coax, twisted pairs of copper, etc.). ------------------------------------------------------------------------- Tom Nelson Scott Phone/Fax: 1-414-966-2902 [company name] Business email: tom.scott [at] veda-home.com W330 N8357 West Shore Drive Academic email: veda [at] csd.uwm.edu Hartland WI 53029-9732 Academic web: http://www.uwm.edu/~veda "Do less, accomplish more." ------------------------------------------------------------------------- ++++ Date: Mon, 24 Mar 1997 09:48:26 -0700 From: Hans Ehrbar <ehrbar [at] keynes.econ.utah.edu> To: aacoho-cis [at] umich.edu Subject: Datacomm infrastructure Hello Ann Arbor cohousers: after your initial inquiry regarding datacomm infrastructure on cohousing-list we haven't heard from you again on that list. We at Wasatch Cohousing in Salt Lake City are also planning the same thing. How far along are you with your plans? Here is something from one of our members which may be of interest to you too: From: "Scott Cowley" <scowley [at] alexandria.lib.utah.edu> Date: Mon, 24 Mar 1997 09:15:32 MDT Subject: High Speeds We seem to be on the right track for the future with optical fiber. Here is an abstract from an article in "Telecommuncations" mag. for 3/97: Gigabit Ethernet: 1000 Mb/s !!! ------------------------------------------------------------------------------------ - Now has an 80-member committee, with equipment to come out in 1997. - PCI is the bus of choice. It is 32-bit PCI runs at 1.057 Mbp, 64-bit PCI at double that. (PCI is an internal arrangement in your computer.) - Optical Fiber is the only "long" wire which supports gigabit speeds. - 4-pair Cat 5 copper wire is expected to be supported when running at 1.25 Mb/s for under 100 meters. -"Multimode" optical fiber cable can go 300 meters, max. It is the cheapest. - Coaxial cable will be useful over 25 meters. - Gigabit repeaters will be limited to one repeater per segment, unlike the present two. - One Gigabit hub could supply ten 100-Mb/s drops. Gigabit Ethernet vs. ATM: "ATM" is another technology which is rated to 2.5 Gb/s as of this year. It started in the banking industry. It has the advantage of having a protocol which can guarantee timing of data. As a result, it can transfer video and audio signals digitally, as well as non-timing-critical data such as computer stuff. The problem with ATM is that it is expensive right now: $700/port, $8995 for an 8-port hub. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> The internet speed market is going to be very aggressive. We can look for prices to fall radically in the near future. Therefore we can probably do just fine with the layout Chris has suggested, well into the future. We might also think of just putting in regular cable hookups until the cost of something like ATM drops enough, and then using it to get video and audio links. That might be around 3-5 years. -- Hans G. Ehrbar ehrbar [at] econ.utah.edu Wasatch Cohousing, Salt Lake City ++++ Date: Fri, 11 Apr 1997 14:21:14 -0500 From: Erich Boleyn <erich [at] uruk.org> Subject: Cohousing and the information age... In the Trillium Hollow Cohousing Group some of us are seriously looking into networking up all our units (the building with all our units will soon start construction). We're curious if others have done/are doing similar things, and both how they've gone about it and how the communities as a whole responded to it. [Geek mode on, for those interested in the technical part] Our current plan is as follows: -- Place twisted-pair ethernet hub(s) in telephone wiring room. -- For twisted-pair ethernet connection between the hub in the telephone room and the units, depending on which is available, use either of: (a) 2 of the available phone pairs in the wall (which is sufficient for ethernet), or (b) cabling pulled through conduit. -- Each unit which is to be connected must get a twisted-pair ethernet connector/adapter for their computer. -- Get a centralized 24-hour (continuous) Internet connection and connect it to the network. This would be either 56K or possibly 128K/256K fractional T1. I.e. the same kind of connection as used by a small- to mid-sized company. [Geek mode off] So, this is a shared full-time Internet connection for the whole community, plus having everybody's computers be networked together. Benefits include: -- Connectivity without using a phone line. This is both simpler, as it's always "just there" with no dialing necessary, and less intrusive, as it doesn't tie up a phone line. -- 24-hour availability (for those of us who care ;-). -- Easy to share information around the community (we have ideas for things like an electronic bulletin board, internal use of e-mail eases leaving messages for people). -- Similar or cheaper pricing compared to most Internet access deals from online services, and much faster service (on average). -- Much simpler setup for end-users who aren't into computers (electronic community info is web pages, and Internet browsing is just starting up the browser at any time). Our pricing strategy is based on the notion that there are a few units (currently 2-3 at Trillium Hollow) who will both use more of the available resources and use it to support job-related activities like telecommuting. These people will pay a large percentage of the operating costs, and then others will pay fees similar to current online providers (probably between $10 and $20 a month). Comments? -- Erich Stefan Boleyn \_ E-mail (preferred): <erich [at] uruk.org> Mad Genius wanna-be, CyberMuffin \__ (finger me for other stats) Web: http://www.uruk.org/~erich/ Motto: "I'll live forever or die trying" ++++ Date: Thu, 20 Feb 1997 14:16:01 -0800 From: Rich Lobdill <richardl [at] silcom.com> To: aragon [at] umich.edu Subject: Re: Datacomm infrastructure Michael: I put forth a similar question a month or two ago. Below I will paste my first e-mail and then some of the most helpful responses: Greetings from Oceano, CA > >I'm working up a proposal to the group which proposes that we wire the >houses such that each house can connect their computer (if they own one) to >an NT server in the common house which will then have a hardwire (non-modem) >connection to the internet. I would envison that we might also have one or >more community computers available for those who would like to use a >computer but don't have (or want) one in their home. > >Bypassing for now the philosophical arguements about society and technology, >I am looking for help locating some info I thought was in the Coho-L >archives but I can't now find. > >Specifically, I belive there is a type of standard home phone cabling which >is built to carry both phone lines and LAN lines (I think it would be >twisted pair for 10BaseT connections). It would make it very simple to spec >this cable for the homes instead of standard three line phone cable. > >Does this jog anyone's memory? Responses: _______________________________________________________________ Probably Category 5 UTP (unshielded twisted pair) is what you are looking for. Category 5 wiring will carry 10baseT and 100BaseT signals. Note that the actually order of the wires is different between phone and 10BaseT so you'll have to specify this to the installer (phone uses 1 pair of wires, 10BaseT uses 2 pairs). Hope this helps! Let me know if I can help. Sunia ---------------------------------------------------------------- Sunia Yang Networking Systems Network Specialist Stanford University sunia [at] networking.stanford.edu 115 Pine Hall MS4122 (415)723-3543 Stanford CA 94305 _____________________________________________________________ You want Category 5 twisted pair. This has 4 pairs in a sheath. The official spec sez you can't intermingle telephone use and data in the same Cat 5 cable, but (at least at 10Mbps) it works. By all means USE THIS CABLE instead of the standard "Cat 3" cable. The cost difference for the cable itself is minimal; what's expensive is the labor of running ANY cable at all. But use a Linux server. It's the same cheap hardware, but you'll have more flexibility and spend a lot less on software. It will work with anything (other Linux boxes, NT or W95, or Macs). The NT server is much less friendly to other protocols (though it's getting better). Linux also lets you use "IP masquerading" to enable a single TCP/IP address to be multiplexed. Depending on the nature of your connection to the internet, this could be a crucial feature. -- Jerry Callen jcallen [at] world.std.com _______________________________________________________________ As someone working in Silicon Valley and on the edge of networking technology, I would suggest pulling Cat 5 UTP to each house. Make sure that all runs stay under 100 meters. This will allow you to easily move to 100 Mbit networking, which people will want within the next several years. Each computer should be equipped with a NIC (Network Interface Card) that does 10/100 autosensing Ethernet. These are less than $50 more expensive than the simple 10 Mbit cards, and they work with 10 Mbit stuff today -- you just upgrade your central hub or switch later to 100 Mbit connections and you don't have to touch any of the systems. They all will just auto-sense that 100 Mbit is there now and shift gears. Sounds good? That's why most large corporations have standardized on this. Put your cabling into conduit and put a pull-string in with the wire for pulling whatever else through in the future ... D.B. I have yet to move on spec'ing the design with our electrical engineering people, but some of our newest members really liked the idea. The catch phrase I came up with for use by the marketing comittee is "Telecomuter Ready" housing. Good Luck Rich Lobdill
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