Manual

System performance depends on the number of Tags in range of individual cell
controllers, and whether the Tags chirp frequently or infrequently. For example,
if 50 Tags within range of a single Cell Controller are configured to chirp at the
default rate of 3 seconds, there is a 99% chance of seeing a specific tag within
5 seconds, and a 99% chance of seeing all Tags within 8 seconds. With 100
Tags, these values increase to 6 and 12 seconds, respectively.
The associated graphs provide performance estimates for various Tag popula-
tions within range of a single Cell Controller, up to 500 tags. Two graphs
assume the default of a 3-second tag, a third graph shows similar data with a 1-
second Tag. Most installations have a large number of Cell Controllers, with the
Tags divided among them. For example, if an installation has 750 Tags equally
divided among 10 Cell Controllers, system performance can be estimated based
on 75 Tags per cell controller. Increasing the number of Cell Controllers, or
decreasing the number of chirps per tag can increase system capacity.
With populations of 100 tags or fewer, performance can be substantially
improved by configuring tags to chirp more frequently. The third chart shows
performance of a tag that chirps once per second, compared with the default of
3 seconds. Note that 3-second tags perform better with tag populations of 300
or more, while 1-second tags are better at lower overall tag populations.
T20 B
ATTERY LIFE
The battery life of a T20 tag is over a year (1.2 years) with a tag that chirps
once every three seconds, which is the default. Configuring tags to chirp more
frequently then every three seconds reduces battery life roughly proportionally.
For example, a tag that chirps twice as frequently will have approximately half
the battery life.
Similarly, battery life may be extended by programming tags to chirp less fre-
quently. This is particularly a consideration for asset tracking applications. The
battery life roughly doubles by increasing the chirping interval from 3 to 20 sec-
onds.
The T20 is our most current tag model.
TAG READ RANGE AND ORIENTATION CONSIDERATIONS