SDT 5000 User Manual
Document MBUD-0109v11
Unlike Standby mode, scheduled events do not automatically turn on the transceiver. The
transceiver is only turned on based on outgoing calls or the poll interval. The duty cycle is based
on the underlying communication retries such that the wake period will correspond with one of
the communication retries. The duty cycle determines the average power consumption of the SDT
5000 while running in Polled mode.
Poll ON
Poll OFF
Fail
Fail
Fail
Success
Communication
retries
Host Connect
status
Figure 7 - Polled Mode Operation
Pros: Able to receive messages at any time, lower power than continuous.
Cons: More network traffic, which translate to higher airtime charges, highest message latency,
higher power than standby.
Polled mode supports a recovery mode where if the satellite is not visible the Poll On time is
increased to allow the satellite signal time to be acquired, the corresponding Poll Off time is also
increased to maintain the duty cycle. The duty cycle is maintained to ensure that the net power
consumption is preserved.
Version 1.1, 03/24/06
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