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Geir Holmavatn · Guest

Hi,

We have a school with several builings and dorms. Our server room is
situated somehow in the middle and there are buldings lined up in two
directions, the farthest away is around 400m from the servers.

We need to connect LANs in each of these buildings to the servers. I
assume that multimode fiber is the way to go as the distance is within
limits, but I need some hints on the available options.

Also we want to distrubute *two* different nets. Can the fiber be 'tapped'
at each builidng or do we need separate fibers for each house?

I would appreciate tips on 'budget' solutions and links to pages with
relevant informations

thanks in advance

geir

Dale Farmer · Guest

Geir Holmavatn wrote:

Geir Holmavatn · Guest

"Dale Farmer" <dale@cybercom.net> skrev i melding
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SysEng · Guest

"Geir Holmavatn" <geirh3@hotmail.com> wrote in message
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Perkowski · Guest

Geir Holmavatn wrote:

Justin · Guest

Understanding the difficulties with money at a school (I work at a state
college) but I would highly recommend doing this on the cheap. When you
get in to this realm of cabling, you've really got to do it all right or
not at all. Because if you just sort of band-aid it in now, you'll be
doing it again in 4-5 years, whereas if you do it right, you won't have
to do anything with in in 25 years. And that's just considering
technological advancement, not to mention maintenance which could be
something you end up dealing with once a year if not more.

Having said that, how to do it right?

Yes, a fiber cable could be "tapped" (run a 24 strand, drop of 4 strands
at each building), but you really wouldn't be saving much. Fiber isn't
really all that expensive, it's the labor and the termination that kills
ya'.
Anyway, first off, I would suggest singlemode cable, unless the hardware
you already have is multimode. Reason being, the only multimode I would
put in is 50 micon laser optimized for 10gig @ 300m, (don't flip about
the 10gig, it's really only a unit of measure here) and doing so would
limit you're future usability as you're over 400m in some places. Also,
singlemode fiber is cheaper than this particular multimode.
Next, for cable counts, there are a couple options. First, I'd homerun
a cable from your server room to each building with 12 strands. This is
the most flexible, and the method that will last you the longest without
having to do anything with it.
Another option is to loop through each building, but to do that would
require more strands.
Example: if you have 7 buildings, 3 each direction from your central
server room. Run one 48 count to the first building in each direction,
then from those 24 strands to the next building, then from those 12
strands to the last building. You would have to patch through at each
point, so for the furthest buildings, this gives you 2 additional points
of failure as well as several dbs of additional loss, which may be too
much for you signal loss budget.

The other option is to put extra fiber connection (GBICS) in your
switches in each building and hang the next building out on the
previous, but this could cause serious bandwidth/through-put issues.
The would allow you to put in equal numbers of fiber counts (12 minimum).

For termination, the most cost effective is to do use a wall mounted LIU
from any of the major manufactures. But that depends on what you have
in the way of telecom space in each of the out buildings. If you have a
full room with a rack, I would do rack mounted, again for the
flexibility. I prefer Panduit's rack mount fiber trays/drawers.

And that's about as far as I can really speculate. You really should
have a professional telecom designer put something together for you. A
badly designed and installed system will cost you twice as much as a
properly designed one from the beginning.

justin

Geir Holmavatn wrote:

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