User's Manual

Installation_________________________________________________ Boomer II User Manual & Integrator’s Guide
Copyright Wavenet Technology © November 2003 42 BM210012WT37
Source Based Time Averaging Function
For portable or handheld applications the integrated host/terminal must
comply with OET Bulletin 65 and Supplement C (June 2002) with
respect to Specific Absorption Rate (SAR) requirements.
The Boomer-II modem module operates on a packet data network
which sets the timing of most aspects of the RF signalling protocol.
The shortest transmit event over which the Boomer-II modem has
control is a transmit transaction which is comprised of a series of
transmit pulses.
For portable or handheld applications a source based time averaging
function has been incorporated in the Boomer-II modem firmware.
This function limits the transmit duty cycle by controlling the timing of
when transmit transactions are initiated and the delay period between
them.
When a data transmission occurs, the actual transmit time is recorded.
Subsequent data transmissions are inhibited until a delay period (idle
time) has elapsed to ensure the average duty cycle of transmissions is
less than the preset “Duty Cycle” limit. Any delayed user data that is to
be transmitted will be buffered until it is permitted to be sent.
The algorithm for the Source Based Time Averaging transmit control
and the relevant parameters are given below:
 Idle_Time = Duty_Factor * Transmit_Duration
 Duty Factor = (100 – Duty_Cycle%) / Duty_Cycle%
 Duty_Cycle% = Preset limit for SAR compliance
Source Based Time Averaging Transmit Algorithm
No
Yes
No
Wait for data
Decrement
Idle_Time
Transmit data
Determine actual
Transmit_Duration
Buffer data
Decrement
Idle_Time
Yes
Has the transmit
Idle_Time expired?
Set Idle_Time =
Duty_Factor *
Transmit_Duration
Any data to
transmit?