Hello Henrique, thanks for sharing your knowledge. Am 2009-04-01 21:44:45, schrieb Henrique de Moraes Holschuh: > I have to agree: for large capilarity, GPON (or better yet, GEPON) is > a very good idea. It allows you to deliver reasonable bandwidth at > much smaller costs if you have hundreds of sites to connect (let alone > for thousands). After searching the Internet, it seems it is exactly what I was searchin for. > I do _not_ know if GPON and GEPON are going to cut it for the German > law requirements. The topology is highly assimetric re. upstream > versus downstream bandwidth, and the network design can have very > different levels of oversubscription, so check that first. Yes, it is waht we need here... Downstream 100 MBit and upstream 2 MBit. Since HDTV is transfered over UDP, the upstream can be very low > Whatever you do, you should have a real backbone of single-mode fiber > cable to connect the various POPs. And you should make sure you have > at least two paths to each POP, because you _will_ have fiber cuts, > often more than one at the same time. Since <http://www.gasline.de/> has an existing Infrasucture of ringlines two connectiopns per POP/village is no problem otherwise we could run into legall issues if our users starting to use VoIP and disabling there old POTS... > Typically, one uses a mix of stars and rings for the backbone (if a > dual ring is not enough to cover all interesting POPs), where each > spoke or ring segment is done using two cables going through diverse > paths that never cross. This is already checked by me and GasLINE and fit our needs. > Also, laying the fiber cable is almost always a lot more expensive > than the cable itself inside a city (short hauls, lots of annoying 20-40 Euro/meter over land 50-90 Euro/meter in the city > issues to lay the cable), so it pays off to not go cheap on the > backbone and get very good self-healing (if possible, armored) cables > with a decent number of fiber cores per cable. In the cities we have already empy Double-Tubes in the sidewalks. These are owned bx the villages/cities and can be used for free. > You can do with a lot less fiber when using DWDM, but DWDM that you > can count on to keep your backbone working with a decent number of > nines is _very_ expensive. It is good for long hauls (like inter-city > ones), though. I have already read a bunch of this technology, but it is very new and currently I do not know... > The G*PON last-mile links are built the cheapest you can do and still > keep it running without too much downtime, though. Thanks, Greetings and nice Day/Evening Michelle Konzack Systemadministrator 24V Electronic Engineer Tamay Dogan Network Debian GNU/Linux Consultant -- Linux-User #280138 with the Linux Counter, http://counter.li.org/ ##################### Debian GNU/Linux Consultant ##################### <http://www.tamay-dogan.net/> Michelle Konzack <http://www.can4linux.org/> Apt. 917 <http://www.flexray4linux.org/> 50, rue de Soultz Jabber linux4michelle@jabber.ccc.de 67100 Strasbourg/France IRC #Debian (irc.icq.com) Tel. DE: +49 177 9351947 ICQ #328449886 Tel. FR: +33 6 61925193
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