Specifications

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DSI SS7MD Network Interface Boards Programmer's Manual Issue 4
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The temperature of the boards within a system are periodically measured, and should
the temperature of any board exceed a fixed safety threshold then a warning will be
provided to the host chassis that the threshold has been passed, a
MGT_MSG_EVENT_IND message with a status field of 0xc0 (Exceeded Thermal
Threshold) will be sent to SIU_MGT_TASK_ID (0xdf). If the board temperature remains
above this threshold limit for 30 minutes, but does not exceed the temperature at
which the board shuts down, the MGT_MSG_EVENT_IND message will be repeated and
this will continue every 30 minutes whilst the condition is maintained.
Thermal Shutdown
If the temperature of the board continues to rise, a second threshold will be passed at
which, to protect the hardware, the board will be shutdown. On reaching this Thermal
Shutdown threshold, the user will be notified via a SSD_MSG_STATE_IND message
with a status field of 0x62 (Board Failure) and a failure code parameter set to 0xd7. A
MGT_MSG_EVENT_IND message with a status field of 0xd7 (Shutdown due to Thermal
Issues) will also be sent.
Once these messages have been sent, all outstanding messages and all subsequently
received messages destined for the board will be discarded.
Reset after Thermal Shutdown
Once the board is shutdown, power can only be restored by a full power cycle of the
board.