This is Beagle-Ears
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I work in a senior engineering position in a company that makes
wireless networking equipment. I am also becoming personally interested
in this technology. Since this is my personal website, you
will not find any links to my employer's business here; there are other
ways to find out about that part of my life. Instead, you will here find
background articles about the technology, and in some cases, links to
other companies that are significant in the field.
Like other aspects of the telecommunications industry, wireless
data can be segmented in different ways:
- By what it is used for:
- Voice telephone applications: Cellular telephony, backhauls from
cellphone base stations to switching centers, wireless local loops.
- Leased Line replacements: T1/E1, for frame relay, voice trunks,
private data networks.
- Campuswide data networks (linking buildings)
- Indoor LAN supporting roving laptops in the corporate office.
- By whether the nodes are mobile or fixed
- By ownership:
- Public carrier operated networks: Cellphone enhancements,
Metricom Ricochet, etc
- Internet Service Provider operated networks, including
licensed LMDS services
- Private networks: One company setting up 3-10 nodes to serve
their own needs
- By link-layer protocol types:
- Point-to-point: full-duplex two-way synchronous, time-division
duplex synchronous
- Point-to-multipoint, token passing (ethernet bridging)
- Multipoint-to-multipoint, CSMA/CA (distributed timing),
802.11 and derivatives
- By frequency bands:
- ISM-900
- ISM-2.4
- UNII 5.7
- ISM-5.8
- LMDS
- MMDS
Each of these characterizations defines a different angle on the technology,
which may impose particular restrictions, define requirements or
open special opportunities.
In a field that is rapidly advancing, it is important to look beyond
what can be currently be done , in order to get ideas for what is to come.
Many of the wireless data networks of the future will be based on
the IEEE-802.11 standard for Wireless Local Area Networks.
These networks are 1MBps, 2Mbps or 11Mbps, operating in the ISM-2.4 band,
mostly indoors and at low power. However, many ISPs have added
external power amplifiers and directional antennas (skirting the
edges of FCC regulations) to create internet access networks covering
areas of several square miles.
The following introductory articles will help you begin to
understand 802.11:
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$Log: index.htm,v $
Revision 1.12 2002/01/14 23:39:00 lars
Added page of installation accessories.
Revision 1.11 2001/10/26 13:28:23 lars
Replaced CMC -> Beagle-Ears
Revision 1.10 2000/08/31 15:34:41 lars
Added UCW ad banners on CMC index and Lars wireless pages
Added link to TEXEX history on comphist index page
Added a link to crypto page
Revision 1.9 2000/06/19 19:28:05 lars
*** empty log message ***
Revision 1.8 2000/01/21 05:28:37 lars
Add Lamarr-Antheil patent and links.
Revision 1.7 2000/01/12 00:52:12 lars
Added "blue sky" page.
Revision 1.6 2000/01/11 19:05:10 lars
Added FCC rules (47CFR15).
Revision 1.5 1999/12/14 00:54:06 lars
Add link to WLAN product directory.
Revision 1.4 1999/11/30 01:29:35 lars
Add navigation links at bottom.
Revision 1.3 1999/11/30 00:38:27 lars
Add pointers to page descring frequency bands.
Add more visioning article links.
Revision 1.2 1999/11/27 22:57:34 lars
Added Wireless ISP list (still under construction)
Revision 1.1 1999/11/17 20:22:50 lars
New section: Wireless Data Networking.