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LOCAL WIRELESS LAN

By stergios_nik ·
Hello.

We are planning to install a local wireless LAN to our 5th floor building.

We want to cover only the 2nd, 3rd and 4th floor. I think that on the 3rd floor it is a good place to install the main access point in order to cover the other floors.

We have located this 3com product:
http://www.3com.com/other/pdfs/products/en_US/400803.pdf

We have no any prior experience on wireless lans thus I would like to tell me:

1. If this product will do the job.
2. Any security issues that I should check.
3. Any other issues that I should ask the vendor about wireless products.
4. If you can advice me based on your experience about wireless technology.
5. If you can propose any other products.

PS: I intend to install 3 access points (one for each floor). Is this a good idea?

Thank you in advance.

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by stergios_nik In reply to LOCAL WIRELESS LAN

The 3COM product that we intend to use is this:
3Com? OfficeConnect? Wireless 11g Access Point

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by sgt_shultz In reply to LOCAL WIRELESS LAN

this strikes me as kinda big for first project. i have only done a couple, not as big as yours so fwiw:
3com office connect. cheap. i wonder how much help they will give you. does airaya have anything you could use? you could fish there anyway, real tech people to talk to there...
1) will product do the job within floor? that is the question. it is rf that is your limiter, not the product so much...you need visual and radio line of sight as you know...in an environment like building floor, seems to me you just gotta try it...
Just use the security built in. change the id, username and password from the factory one, don't have it broadcast it's id, use WEP,
get your hands on some equipment right away for prototyping. a picture of what security options offered is worth 2000 tech republic words...
only buy stuff you can send back easily.
your local isp may offer wireless and might be a good resource for product. be patient and see if you can get ahold of the right person there. maybe the installers.
do not let your management pin you down on budget yet. antenna cable very expensive. you won't know how much you need, your cost until you do site survey and some prototyping....
here is the thing about security. wired lans have exactly same issue. if somebody can tap into line, they can sniff your traffic, look for passwords, sensitive info...with wired lan, they hafta be in building. with wireless they can tap in sometimes not being inside locked doors.
you will find you can predict (draw on paper, i recommend it) the places where your wireless signal exists. you will see if only available to window washer, for example. no sweat.
and if you use encryption on your network no one will make any use of any packets they can sniff, on the wire or off.

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by Greybeard770 In reply to LOCAL WIRELESS LAN

1. Wireless networking is not an exact science. Depending on the size of the floors, obstructions, walls, concrete, elevator shafts, and various things the unit will likely work. It will work better for those who are closer to it.
2. WEP is good. They say 64 bit is good enough and that 128 bit is not twice as hard to crack and there is a performance cost for it. WPA is better.
3. Dont ask a salesman - they will promise you everything.
4. A site survey is a good place to start. Basically you set up your access point and see how far it reaches to your wireless NIC. You will notice the signal (throughput speed) degrades as you get further away. One AP may be enough. You may need more, depending on the random things in the environment.
5. We use over a dozen Proxim APs along with a (expensive) Vernier security/management infrastructure. You can get by with just access points.

The thing with wireless is you can't stop it just because your building ends. If you cover the 2nd floor, you will probably be providing some access on the ground floor and for that matter the parking lot as well. If you interfere with your neighbors, they will not like you. You may be surprised when you click on SHOW WIRELESS NETWORKS on your client and see WLANs you had no knowledge of. Start slow and get comfortable before you expand. And you will be lucky to get 17Mbs throughput on that 54Mbs connection do to the overhead of wireless communication.

A wise man told me "If you can use wire, use wire. If you cannot use wire, use wireless."

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by wlbowers In reply to LOCAL WIRELESS LAN

First have a contractor come in and do a site survey.

This should include a spectrum analysis of stray frequencies that might be in your area. You don't want to install the system go nuts trouble shooting only to find out you are right in the line of a microwave tower.

The survey should include an active mapping of the floor for the frequency(s) that you are going to use. They will set up a transmitter and using a Frequency db meter chart the floor for signal strength.

If The survey goes well you might want to look at a system like the 3Com Wireless LAN Access Point 8750

http://tinyurl.com/24ae4

The system you are looking is not intended for a large scale project such as yours. You are going to want an expandable system with the current security abilities. You are basicly opening yourself up to the world with a wireless lan.

Three access points are the only way to go. Hardwire to them and configure for the floor.

Don't try to lowball this system. You will have nothing but trouble.

Good Luck Lee


Ut

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