User's Manual

WIT2410P
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 2000- 2005 Cirronet
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 Inc 52 M-2410-0000 Rev F
Appendix I – Operating Scenario for WIT2410P
The WIT2410P is used in a portable application. The system is set up as a star network with a
number of radios, called remotes, all linked to one central base radio. These remote radios are
installed in belt packs that fit around the waist of the user. Given this configuration, the remote
radios will generally be closer than 2.5 cm to the user and will require a portable designation as
part of the grant. The Base radio is placed at some central point, usually as high as possible, in
the facility to provide better coverage to all remotes.
Any remote can communicate with any other remote by means of data packets routed back and
forth through the base radio. The base radio provides synchronization for the entire system,
passes messages from one remote to another, and provides broadcast messages for all
remotes to hear.
The WIT2410P uses Frequency Hopping technology to mitigate the effects of fading and
jamming. The dwell time for this system is set to 10 milliseconds. In any 10 ms dwell period, the
following process takes place sequentially in time:
Start of dwell
1. Base broadcasts messages to all remotes,
2. Remote #1 sends its message to Base,
3. Remote #2 sends its message to Base,
4. Remote #3 sends its message to Base,
5. Remote #4 sends its message to Base,
6. Remote #5 sends its message to Base
To N… Remotes
After the last Remote sends its message to the Base, the 10 millisecond dwell time is complete
and all radios hop to the next frequency channel in their hopset and the cycle is repeated.
We are asking for portable designation of the remote radios since they will be operated in close
(< 2.5 cm) proximity to the user. The operation of the Base radio is already covered by our
current WIT2410G grant with its 20 cm exclusion zone around the antenna