8022.11g long distance: any issues vs. 802.11b?

We currently have an 802.11b wireless link between two campuses of our
university. The link is 5 miles line-of-sight using highly
directional dish antennas. We are using Cisco Aironet 350s, and are
getting a throughput of around 4Mbs.

Would there be any advantage to using 802.11g over this link?

Thanks in advance for any input.

On 8 Jun 2004 07:35:30 -0700, (E-Mail Removed) (Tom Hansen) wrote:

~ We currently have an 802.11b wireless link between two campuses of our
~ university. The link is 5 miles line-of-sight using highly
~ directional dish antennas. We are using Cisco Aironet 350s, and are
~ getting a throughput of around 4Mbs.
~
~ Would there be any advantage to using 802.11g over this link?
~
~ Thanks in advance for any input.

Yes, you should be able to get an improvement in throughput by
changing to 802.11g bridges such as the Cisco BR1310s.
You can see a spreadsheet that will allow you to calculate the
likely supported data rates for your distance, depending on
the antennas used etc. at
http://www.cisco.com/en/US/products/...ence_list.html .

For example, with the BR1310's builtin 13dBi patch antennas,
this says at 5 miles LOS, you should be able to get an
802.11g rate of 18Mbps - i.e. throughput around 8Mbps.
With 21dBi dish antennas, this would get you up to a 36Mbps
802.11g rate or say 17Mbps of throughput.

Aaron