From: John Foust <jfoust@th...> - 2002-04-20 12:31:55
On April 10, I wrote:
>I remember reading or discussing a distance factor of some
>sort - a built-in time delay for the receipt acknowledgement
>of a signal sent out - that limited the AP to talking to
>clients within a mile or so. Bridges, on the other hand,
>didn't have this limit.
>I'm looking for web resources that discuss this. I'm
>obviously searching with the wrong key words. Can someone
>point me to a discussion of this?
I've found more answers to my questions, but also a few
The Aironet 350 Series Wireless Bridge (AIR-BR350)
has a Radio menu setting called "Bridge Spacing" from 0 to 40
kilometers. The manual says "The Bridge Spacing setting adjusts
the bridge's timeout values to account for the time required
for radio signals to travel from bridge to bridge."
The AIR-BR350 are $1329 at Ingram. These are also called
"Ethernet Bridges" on Cisco's site. They have an access point
mode, so cold be used at a central location to connect multiple
sites. I didn't see any limit on MAC addresses passed; it's
no doubt finite but what works in practice?
Contrast this with the eight-MAC-passing Cisco Aironet 350
Series Workgroup Bridge (AIR-WGB352R) at $430. These have
no "Bridge Spacing" setting. Similarly, neither does the
Access Point (AIR-AP352E2R) at $582 each.
A Cisco-related consultant tells me the AIR-AP352 AP has
its "bridge spacing" equivalent setting hard-coded and
not adjustable, and it's set to about a mile.
However, I found at least two people on the BAWUG list who
say their AIR-AP352 reaches farther than a mile. In one case,
almost four miles. How far will they go, and how much does
bandwidth degrade over distance, or what other aspect degrades
in this situation?