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Network wirering to central location

We recently bought a two story building to be moved into first quarter of next year. The building use to be RiteAid pharmacy building for hundreds of employees and there's only 50 of us.   The building network cable is wired to one central patch panel in the server Room.  We want to rent out part of the building as we wont use the first floor. My question is what would you recommend for separating the cables that run to one central location in a building that will potentially be used by 3 different companies?
would we have to re-wire the whole building? The server room is also in a section up stairs that we would rent.
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Commented:
I'm hoping all your LAN conections on the patch are labeled in the server room and in the office LAN jacks?  Typically all the jacks are labeled by office or room number and the number of jacks in that office ex Room 123 has 3 jacks...jack 1 is labeled 123.1, jack 2 123.2, etc and these should all be labeled the same in the server room so you know whats yours and what's other floors.  Then you would need a switch with enough ports to handle all your jack inputs, cisco makes great switches but can get pricey. this switch would then connect to your servers.  The biggest concern is security, letting other companies have access to that cable room, they hook up one cable to your switch from one of their ports and they can potentially access your network, not to mention stealing equipment.   Luckily, you are in their first in and can do what you want with the room since you're renting it.  You can pretty much find all of your floor cables, set up your network and cut the remaining 2 floors from the panel, they woul have to have their cables re routed to another room on their floors for their network

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Commented:
any other alternatives? lets say we get the switch how do we handle our T1 and another person coming into the same server room?

Commented:
You may need to have your t1 ran to that room, but there should be some sort of connection line someplace in there already if it was at somepoint a data center for a company.  Typically your T1 comes into you T1 router, to your switch, which all your workstations and servers are on.  Check this cisco router and diagram

http://www.cisco.com/en/US/prod/collateral/routers/ps9305/data_sheet_c78-549906.html

As for security- I don't know how big the room is but they do make mobile, locking rack enclosures for your servers and switches..you also have to consider cooling, especially if 2 other floors will put there equipment in there.  You'll need rack mounted battery backups..APC makes great ones, rack mounted servers and switches.  Take a look at the enclosure below, they make all different sizes..

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=5394595&CatId=4555

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Commented:
Thanks Paul.

I have to double check if all the connections are labelled.  Actually all of our servers are in a Dell rack at the moment, it's just that I don't have the key for the lock, our switches and routers are not though.  So if I was to occupy half of the second floor I would need to rewire everything?
Commented:
Well..really it's a security issue...No you don't have to rewire everything, but it would make sense to seperate the ports you'll be using for your half the floor from the rest of the building.  Once you discover which ports in the main junction panel are strictly yours, remove those network cables from the back of the panel and rewire just those to a complete different panel that can be mounted in a locking, rack cabinet...so now you have your cables coming from all your office wall jacks, coming directly to a panel that is locked in your cabinet.  From that panel you connect all the office jacks you need lit up to the switch.  Of course some of those switch ports need to be reserved for your servers.  All your switches and servers can be mounted in the rack cabinet and locked up, that way your entire network is seperate from the rest of the building entirely and all neatly in a cabinet.  So you're not rewiring the building, all wiring will still be done in the one room that the cables junction in, you're really just moving the cable to a different panel.

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Commented:
We will move into the building and let our future renters worry about there own.

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Commented:
thanks.

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Commented:
thanks you Paul.  We ended up wiring everything to a new data room downstairs.