2) an internal building LAN built using 802.11b will provide 11Mbps (with real world performance of ~5.5Mbps).
3) client density is also an issue. assuming a worse case scenario of all clients streaming video (64kbps) simultaneously with 5.5Mbps/AP that leaves you with a client load of around 85-95 clients at any one time, per radio, per channel. also it should be noted that it would require almost three and a half T1's to support this many clients at one time. the work around to support another 85-95 clients is to add another radio on a different channel and another three and a half T1's.
4) to provide Internet connectivity to a building that would match the speed of the internal LAN using 802.11b (5.5Mbps), in todays market, would require ~3.5 T1s (at a cost of $800-$1000/T1/month). i think we can be pretty safe to assume that is not going to happen.
5) there are other technologies like 802.11g that give 22Mbps per channel (real world throughput is probably about half that), but they are not official and yet to be ratified by the standards bodies.
I say use WiFi and Cat5 cable. 802.11b IS NOT YOUR BOTTLENECK...
use Cat5 as the backbone to one or two points on each floor and 802.11b for the last 50-100 yards.
this is all just rule of thumb stuff, each implementation is unique and requires a detailed site survey to ensure you take all the factors into account.
Marcos R. Lara Founder and Managing Director Public Internet Project and Co-Creator of the Bryant Park Wireless Network
At 05:58 PM 4/6/2003 -0700, Jon Baer wrote:
I'd also keep the "mobility" in mind ... and 9 times out of 10 the cost of cable + NIC will leave you with much more bandwidth and cost less per machine than APs + WNICs. Also there is no way (for now or for a very long time) that wireless will beat out fiber optic / 10 gigabit ethernet. (which will be the norm in 3 - 4 years). Id say grab the blueprint and label out items of wireless interest like cafeterias/auditoriums/etc and let the network guys leave room for it.
- Jon
----- Original Message ----- From: "Ben N. Serebin" <[EMAIL PROTECTED]> To: "Cynthia LaPier" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Sunday, April 06, 2003 5:44 PM Subject: Re: [nycwireless] Would you all react to this?
> Hello Cynthia, > > It all depends on the size and construction of the school? I would > probably still use a wired backbone. It's very difficult to suggest using > wireless when one is not familiar with the environment (in this case, the > school building). There might be many reasons not to use it. Also, what > happens if you want to do wireless, and no one is able to implement it... > that's a major portion of the equation. I would trust the advice of your > network consultant, or get a second opinion from another consultant who is > able to visit the location. > > Good luck, > -Ben > > > ----- Original Message ----- > From: "Cynthia LaPier" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Sunday, April 06, 2003 6:34 PM > Subject: [nycwireless] Would you all react to this? > > > > > > In about fourteen months, we are going to be outfitting a new school - the > > construction has started but the bids for cabling, networking etc have yet > to > > happen. And of course we are over budget. So I proposed that we make it a > > wireless building. I am suggesting that instead of running cable to every > > classroom, we run it to significant geographic locations and use wireless > > workstations, laptops, LCD projectors, etc. I can't figure out what to do > > about printers which we seem to have to have in EVERY classroom. Is this > > decision too risky? Are we going to end up wiring the building three or > four > > years later? Will the response time be so bad that the kids will revolt > (it is > > a middle school)? What other things should I be thinking about? > > > > Any input from this group would be welcome. We have network consultants, > but > > quite frankly, they have very limited interest and experience in wireless. > In > > fact, they are probably miffed that I have even suggested this. In > > anticipation of your bounty of responses, I thank you. > > > > Cynthia LaPier > > CIO > > Plainedge School District > > No Massapequa, NY > > [EMAIL PROTECTED]
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