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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Custom Wireless Solution
please pardon the late follow-up. Small bit of information here guys/gals, 802.11 uses frequency hopping spread spectrum (FHSS) technology, and is rated at 3 mbit (2mbit real) using the 2.4 to 2.483 ghz ISM band, due to the frequency hopping, and low data rate, it is possible to squeeze more clients, and access points, into the same air space, 802.11b uses direct sequence spread spectrum (DSSS) and is rated at 11mbit (6mbit real), implements WEP, but only allows 3 access points per airspace (each access point will use up 1/3 of the band) with a usable maximum of about 16 clients (YMMV). I ran an ISP deploying 802.11 wireless internet to the clients, using 802.11b along with some proprietary 45mbit 5.2/5.8ghz radios for the backbone. Yes, you run into problems with schools/college dorms/mom & pop/microwave ovens/cordless phones/etc, no, it doesn't work well for that sort of thing (wasn't my idea =) As a side note, we did manage to get a 21 mile link working with 150 feet of elevation on both ends, dual 24dbi grid antennas (directional, small beamwidth) on both ends, and 4 watts EIRP (on both ends). Matthew S. Hallacy
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