Manual

A Tags chirp length is 2.3ms. While a Tag is chirping, it is responding to incom-
ing signals. A Tag can only
be detected by an antenna
only while it is chirping.
Tags chirp asynchronously,
meaning they are not syn-
chronized to the reader or
to each other. To prevent
two Tags from continuously
chirping in synchronization,
the chirping interval
includes a randomized off-
set, utilizing a function that
incorporates the Tags ID.
The combination of the off-
set and the very short 2.3 millisecond Tag signals minimize the number of Tag
collisions. There is a possibility that Tag reads will be lost due to collisions,
particularly if there are large numbers of Tags in range of a given Cell Controller.
A Tags chirp interval (the period at which it repeats its chirp) can be set if nec-
essary. A variety of chirping intervals are supported in the T20 tag. The default
chirp interval is 3 seconds. Alternatively, chirp intervals of 0.5, 1, 2, 3, 4, 5, 10,
15, 20, 30, 45, or 60 sec-
onds can be set in the fac-
tory, in accordance with
end-user requirements.
Faster chirp rates mean
Tags will be detected more
rapidly. On the other hand,
Tags with faster chirp rates
have shorter battery lives.
Generally, chirp intervals
are set lower for critical
hardware and higher for for
larger, less mobile or less
critical assets such as
desks.
Time to See All Tags
0.0
10.0
20.0
30.0
40.0
50.0
60.0
0
50
100 150 200 250 300 350 400 450 500
Tags in Range of Cell Controller
Seconds
Average
90.0%
99.0%
99.9%
Time to See Specific Tag (99%)
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
0
75
150
225
300
375
450
Tags in Range of Cell Controller
Seconds
1 sec tag
3 sec tag