104
SD Series Ref. Manual (Packet & Transparent Mode)
MDS 05-4846A01, Rev. C
Intrusive
operation means that the payload application data will be
interrupted while programming data is sent over the air. This is the
fastest method of programming radios over the air, but it comes at the
cost of interruptions in the primary use of the radio network. See
Table 17 for the approximate times needed for intrusive reprogram-
ming.
NOTE:
Intrusive mode should be used only when the radio channel
can be devoted to the reprogramming operation.
Passive (Non-intrusive)
operation “piggy-backs” reprogramming data
onto normal payload data streams, thus allowing payload data to con-
tinue uninterrupted. This mode
requires
payload data to be sent so that
the reprogramming data can be conveyed.
The disadvantage to this type of operation is that it takes longer to
convey the reprogramming information since it is must be attached to
existing data transactions. See Table 18 for the approximate times
needed for passive reprogramming.
Table 17. Approximate Reprogramming Times—Intrusive Mode
Modem Speed
(bps)
Approximate Time Required
4800
1 hour, 30 minutes
9600
35-40 minutes
19200
20-25 minutes
Radio assumptions: Signal strength -85 dBm or
stronger, Packet Size: 40, Block Size: 512, Retry: 3
Polling assumptions: Serial polling with 1-second poll
time, sending random data at 50-100 bytes. Slower
polling times will significantly increase completion time.
Polling should be temporarily suspended while OTA
reprogramming is active.
Table 18. Approximate Reprogramming Times—Passive Mode
Modem Speed
(bps)
Approximate Time Required
4800
6 hours, 7 minutes
9600
1 hour, 30 minutes
19200
1 hour, 30 minutes
Radio assumptions: Signal strength -85 dBm or
stronger, Packet Size: 40, Block Size: 512, Retry: 3
Polling assumptions: Serial polling with 1-second poll
time, sending random data at 50-100 bytes. Slower
polling times will significantly increase completion time.
