Wireless Broadband

[hari_bhr]

Hi All

Iam working with an ISP in India

we have Good corporate Leased Lines as well as Dial-up Connection Serving

with one DS3 connection

Now i would like to start the Wi-Fi Internet cells in the area of 10KM

Radius, in the City,

Creating number of cells with the distance of each cell is 2KM or 3KM max

iam already using Cisco/Wilan/Micronet for point-to-point

But for the new setup I would like to give a connection to the user non-line

of sight based connection

for both home as well as SOHO's

any body have solution / products/ as well as integration partners

Looking forward to hear from the experts

Regards

hare

[scottmac]

For frequencies at and above 900MHz, line-of-site is pretty much a necessity.

In the US, or at least around Chicago, the central antennas are on top of very tall buildings, mostly in the center of the city.

The client antennas (most often) are also mounted on the roof with enough of a mast to get them above the treeline so that they maintain line-of-sight (and a a little more - trees grow). I've seen masts of 20 feet ( ~6 meters) or so on some buildings.

There just aren't many options; line-of-sight is critical for operation ... elevate or add more central points to increase your chances of visibility. Trees absorb the signal, buildings block/reflect the signal.

Good Luck

Scott

[ashish_gupta]

hi

just a query. that how come cellphone operators above 900 MHZ are able to have their signals inside the building which is pretty non-line of sight. Also i have seen certain radios which claim to work on non-line of sight. hOW IS that possible.

[scottmac]

It boils down to several factors: Saturation from multiple angles, and the "bouncyness" of the signal.

900 Mhz cell phones in an elevator (for example) usually died when the doors close. 900Mhz doesn't penetrate well, and doesn't expecially bounce well (at least not as well as 2 or 5 Gig). 900Mhz is also a much longer wave and needs a larger opening to "squeeze through."

If you can put up an 802.11 network with the same density as a cellular network, then I'd expect that you can have generally the same coverage.

Certainly it can be discussed at a much deeper technical level, but it basically comes down to signal saturation, and the propagation characteristics of the RF in use.

FWIW

Scott