Kontron AT8050 - Manual (Page 22)

Product Description
6 AT8050
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1.6.1.2 Serial Port Feature
• One serial ports available on the RTM face plate through a RJ-45 connector.
• RS-232 signal levels at RTM face plate connector.
• Serial port speed capability is: 9.6kbits/s to 115.2kbits/s.
1.6.1.3 Hot Swap
The RTM8050 supports hot swapping by using the switch connected to the face plate lower ejector. This
switch indicates the coming hot swap action. The insertion of the RTM to a slot is always done over a non
powered connector. During the extraction procedure, the management power is disabled only when the
RTM8050 is removed. This procedure meets the AdvancedTCA AMC behavior.
1.6.1.3.1 Inserting the RTM8050 into the slot
The presence of the RTM is indicated by one signal. The front blade IPMC recognizes the RTM insertion when
the signal is low. After recognizing the RTM, the IPMC turns the blue LED ON and enables the management
power to the RTM. Once the IPMB-L link is working, the IPMC accesses the MMC to retrieve FRU data. After
knowing the type of RTM inserted, the IPMC negotiates with the shelf manager in order to activate the +12V
payload power. After RTM local voltages have been ramped up, the RTM’s MMC enables the RTM Link.
After this the front board IPMC informs the shelf manager there is a functional RTM blade present.
1.6.1.3.2 Removing the RTM8050 from the slot
The RTM_EJECT signal goes HIGH by opening the RTM lower ejector handle. This indicates to the front blade
IPMC that a hot swap action is going to take place. The IPMC then negotiates the removal with the System
manager and if it is granted, it proceeds with the removal process.
The IPMC proceeds to the deactivation by disabling ekey governed links, the IPMC then disables the RTM Link
and turns OFF the payload +12V power. When it is safe to remove the RTM blade from the slot, the IPMC turns
the Blue / Hot Swap LED ON. Front Blade IPMC turns OFF the management power only when there is no RTM
detected. (RTM8050 removed from the slot)