Broadcast Reprogramming Suggestions By Network Type - GE MDS SD Series Technical Manual

96
The disadvantage to passive 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 18. Approximate Reprogramming Times—Passive Mode
Modem Speed
(bps)
4800
9600
19200
Radio assumptions: Signal strength -85 dBm or
stronger, Packet Size: 40, Block Size: 512, Retry: 3,
Download Delay: Extended-1
Polling assumptions: Serial polling with 1-second poll
time, sending random data at 50-100 bytes. Slower
polling times will significantly increase completion time.
NOTE: It is possible for Remote radios receiving a firmware upgrade
to complete reprogramming before the initiating station does.
This is because transmissions are sent out "broadcast style"
and will be sent up to the number of times entered in the
parameter of the radio. In a strong signal environment,
Count
the image may be received successfully the first time, but the
initiator does not know this, and continues broadcasting image
data blocks until the specified retry count has been reached.

Broadcast Reprogramming Suggestions by Network Type

Table 19 provides suggested settings for performing Broadcast Repro-
gramming operations based on the type of network employed. Each
system has unique requirements, but experience has shown that these
settings provide reasonable performance for the network types listed.
Table 19. Broadcast Reprogramming—Suggested Settings
Network Type
Small Networks
(i.e., 10 Remotes or less)
Large Networks
(i.e., 11 Remotes or more)
Repeater Networks
Store and Forward Networks
SD Series Technical Manual
Approximate Time Required
6 hours, 7 minutes
1 hour, 30 minutes
1 hour, 30 minutes
Packet Retry Count
Data Size
40 3
40 6
40 6
40 6
Retry
Block Size Download
Delay
512 Extended-1
512 Extended-2
256 Extended-3
256 Extended-2
MDS 05-4846A01, Rev. H