Re: Large Network, need advice please!!!

["Alex Iruc" <alexiruc rdslink ro>]

----- Original Message -----
From: "Bret Hughes" <bhughes elevating com>
To: <redhat-list redhat com>
Sent: Saturday, March 08, 2003 6:00 PM
Subject: Re: Large Network, need advice please!!!


> I am confused.  Perhaps an overview of what you are trying to do would
> be in order.  You speak of Internet connectivity through a sat link, I
> can get my head around that, but then you ask for a dvb card, Isn't DVB
> digital video broadcast?  I don't see the connection.
www.scsbroadband.com This company offers internet via sattelite 1 WAY -
downlink only, at high speeds, and the DBV card is used for this. The
request for the data you receive via sat is made via a normal isp coonection
(dial-up, isdn, anything). This type of connection if good if you don't need
video conferencing or if you don't want to play games on the net. These
applications require a fast connection both ways (up+down).

The tricky part with the dvb card is that it has a number on simultanious
connections (PID) around 30-50 on a regular card. How will this affect the
network?
That's why I want t know where can I get something better from what theisp
offers.
> >From a shear networking stand point the satellite terminal will define
> what you need to use to connect to it.  Never having done this, I am
> assuming that there is a service provider and specific equipment used by
> them.
> The campus network, and the fiber type, connectors, switches NICs etc
> are all dependent on the specific physical topology of the proposed
> network.  For instance your 15km campus (15sq km?).  you can get 1500M
> out of multimode fiber @ 100Mbs pretty inexpensively. Beyond that
> distance and your are looking at single mode fiber designed for long
> haul and it is more expensive.  Each building (how many? )will need a
> dedicated run to the link unless the campus network can provide that.
> Assuming CAt 5 copper in each building is preexisting you will need
> router with a fiber nic to direct traffic onto the fiber link.

The distance between buildings never exceeds 500-650m. The number of
buildings is 27. I don't have any wires inside or outside the buildings
(network wires) and I must use a media convertor with 1 iniput for fiber and
2 outputs: 1 for continuing the fiber to the next building and another
output for an UTP connection to a 100mb switch that will connect the
computers in that building. The fiber optci cable does not have to be single
mode, I need a cheap sollution and if multimode is cheaper, then...

> These are just a couple of questions that need to be addressed.  nce
> they are, valid questions to fill in the holes will come easier.  Like
> what is a good 100Mb fiber nic (we have had good luck with allied
> telesin )or can a linux box be the router between the cat 5 network and
> the fiber backbone (yes).
>
> If I am misunderstanding the situation please provide enough detail to
> clarify your needs.  I would suggest getting some real help from someone
> who understands these issues.  Most large equipment vendors would be
> glad to help you with network design as part of the bidding process.
> You can then start eliminating proprietary equimpmet where it makes
> sense with linux boxes :)
>
>  HTH
>
> Bret