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New Member

Non-Line of Sight Bridge options

I just want to confirm something.

From everything I've read on Cisco products there is not a Wireless bridge and anntena configuration that will allow me to set up a non-line of site bridge between two locations.

Correct?

I have a customer who has two locations with no line of site. He is telling me that he can use 1310 bridges and bounce the signal off a water tower between the two locations.

I'm sure there is stuff out there that will do that but all of Cisco is line of site from what I can tell.

Any feedback would be helpful.

3 REPLIES
New Member

Re: Non-Line of Sight Bridge options

A reflector or mirror could bounce radio signals, but its size depends on the range between the bridges and probaly other things as well. Im not an radiowave expert but if the watertower has a cylindrical shape i bellieve the signals would most likely bounce back.

Another option is to put a 1310 on the tower in repeater mode. This would then repeate the signals from the Root bridge to the 1310 in Workgroup-bridge mode (a non-root bridge cannot connect to a repeater).

Green

Re: Non-Line of Sight Bridge options

First off: you are correct in that true line of sight is really the best way to go (obvious: Duh).

If you don't have LOS, the sites are "close", and you have some pretty tight antennas ... and... you have an intermediate building (that does have LOS to each end site) ... you can probably do a bounce.

To qualify "close," using a bounce will cost you probably somewhere around 80-90% of your signal (depending on your "reflector"), distance is going to relate to the strength and quality of your signal and the transmission components.

The chances are probably less than 50% for success, so it's a pretty high risk for the expense and time.

As a side note: There are Amateur Radio operators that communicate with each other by bouncing signals off the moon. They get to use more power and usually have some pretty slick antenna rigs ... but given the distance and the rough reflective surface (of the moon) ... the fact that they get anything is encouraging. 2.4 gig is a much "bouncier" wavelength then the 2 Meter, 70CM, and other freqs used by the moon bouncers.

I wouldn't count on a water tower as a reflector, the convex surface would disperse the signal, a good flat surface (like a building in a downtown environment) would be your best bet.

As mentioned by the other poster, a repeater station is a much better bet, if you can get access to a point ~midway (and if it has LOS to the other endpoints).

Good Luck

Scott

New Member

Re: Non-Line of Sight Bridge options

Thanks for the replies. I figured this would be the responses I would get but just wanted confirmation.....

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