Installation________________________________________________ Boomer-III User Manual & Integrator’s Guide
Copyright Wavenet Technology © October 2003
46
BM310012WT04
Power Save Protocol
The modem typically uses current provided by the host/terminal
battery. For the product to be usable for a reasonable period in portable
applications, the host/terminal battery power must be conserved. To
meet this requirement, the modem uses DataTAC Power Save protocol.
The Power Save Protocol defines the following four modem power
consumption states:
Off
The modem is turned off or the host/terminal (battery)
has failed.
Sleep
The processor is sleeping and wakes up to an interrupt,
but the RF section is off.
Receive
The processor is actively processing information; the RF
sections are on and demodulating data.
Transmit
The processor is actively processing information; the RF
sections are on and transmitting data.
Power Profile
The modem’s power consumption profile depends on the usage and the
network configuration of the Power Save protocol.
For example, the following numbers present a typical profile for the
Boomer-III modem based on reasonably heavy usage and assuming a
3.8V supply current: (Power Save Mode = Maximum)
80 % Sleep @ 4.4 mA typical
19.9 % Receive @ 76 mA typical
0.1% Transmit @ 1.6A typical
The actual percentage of total time spent in each state (transmit,
receive, sleep) is a function of the following variables.
Network configuration
On networks supporting Power Save operation, the network
configuration impacts how long the modem must be in the sleep state.
Note
:
Neither Wavenet nor any developer has any direct control over
the network configuration. Networks supporting Power Save are
typically configured to preserve the battery life of modems of their
subscriber base.
Message traffic model
The message traffic model defines how many messages are transmitted
and received, and the average length of the messages sent and received
in a given working day. For instance, a dispatch application could have
a message traffic model as follows:
Messages transmitted in 8 hour day: 25
Average length of transmission: 120 bytes
Messages received in 8 hour day: 10
