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Dialogic
®
DSI SS7MD Programmer’s Manual Issue 3
4.11 Operation of the Thermal Sensor
Thermal Protection
The Dialogic
®
DSI SS7MDL4 Network Interface Board is a high performance, densely packed, low profile
PCIe board supporting high message rates. In achieving this performance, the board may dissipate up to
17W and this must be taken into consideration when selecting both the host chassis and the PCI Express slot
in which to install the board, refer to Appendix B, “Thermal guidelines for selecting suitable servers for use
with a Dialogic® DSI SS7MDL4 Network Interface Board.” In order to guard against hardware failure due to
inadequate cooling from the host chassis, the board is provided with an on-board thermal sensor which, in
the event that the board gets too hot, will shutdown the board.
Safety Threshold
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 stays above this threshold limit for 30
minutes, but does not exceed the temperature at which the board shuts down, a subsequent
MGT_MSG_EVENT_IND will be generated. A new MGT_MSG_EVENT_IND message will be generated after
each 30 minutes period whilst this 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 Board Status Indication (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.