Broadcast Reprogramming Suggestions By Network Type; Ota Reprogramming Overview - GE MDS SD Series Technical Manual
Secure, long range ip/ethernet & serial wireless transceiver
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NOTE It is possible for Remote radios receiving a firmware upgrade to complete reprogram-
ming 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, the image may be received suc-
cessfully 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 Reprogramming 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
OTA Reprogramming Overview
The "Root" is the central location from which polling originates. Other locations in the network
should be designated as "Nodes" which are the receiving stations. Over-the-air firmware up-
grades should always be initiated from the Root. This ensures that all radios in the network will
be properly updated.
Once an OTA reprogram session has started, the initiating radio's user selects either the active or
inactive image stored in its non-volatile storage which is copied to all the other radios in the net-
work.
The initiator broadcasts a series of messages to one or more remote Nodes to accomplish the re-
programming process. The "broadcast" method is used to program the greatest number of radios
in the shortest amount of time, however, the initiating station remains unaware of the number or
success of downstream radios participating in reprogramming.
During reprogramming, the status of the reprogramming will be available on all the radios partic-
ipating in the process. Because the initiator is "broadcast-only" this status can only indicate pro-
gress toward sending out of all of the messages. On the Nodes, the progress toward completion
of reception of reprogramming information is indicated.
Receiving stations can automatically reboot to the new image after successful reprogramming.
Alternatively, there is an OTA reboot command that can be broadcast from the initiator to all re-
92
Packet
Retry Count
Data Size
40
40
40
40
SD Series Technical Manual
Block Size
Download
3
512
Extended-1
6
512
Extended-2
6
256
Extended-3
6
256
Extended-2
MDS 05-4846A01, Rev. I
Retry Count
Delay
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