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BlackBerry MDS contains built-in flow control used when pushing data to a BlackBerry smartphone.
BlackBerry MDS starts by sending, at most, 5 initial packets. As these packets are acknowledged and more packets are sent, a constant window of no more than 5 pending packets is maintained.
The default packet size depends on the BlackBerry MDS version. The default package size is 29 KB for BlackBerry MDS 1.0, and 8 KB or 2 KB for BlackBerry MDS 1.1.
The packet size is configurable using the
Once you open the
If BlackBerry MDS has queued five packets and the BlackBerry smartphone does not respond (for example, the BlackBerry smartphone is outside the network coverage area or is turned off), the packets are queued for 10 minutes. This time value can be configured on the BlackBerry® Enterprise Server under Flow Control Timeout. By default, the Flow Control Timeout value is set to10 minutes. This means that after 10 minutes the packets are cancelled and any outstanding packets in BlackBerry MDS are discarded. This event is identified in the MDS-CS log files as error message 30371, "Packet cancelled locally".In BlackBerry Enterprise Server software version 4 this parameter can be found in the BlackBerry Manager under
The advantage of increasing the