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
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