Technical data

Configuring and Operating the System
AXP 1410 Installation and Use (6806800H70D)
104
voltage sensors to detect backplane voltages, current sensors to detect current to the
backplane, and on-board circuitry to detect failures on the PEM. The PEMs are managed by the
Sentry Shelf Management software. Refer to Chapter 7, FRU Information and Sensor Data
Records, on page 123.
Figure 1-3 on page 27 provides a conceptual view of the connections between the PEMs,
backplane, FTMs, and SAMs.
5.6 Fan Tray Modules
This section discusses the operation of the Fan Tray Modules (FTMs) of the AXP 1410.
5.6.1 Description
The FTMs are loaded with AdvancedTCA IPMC firmware. The fans are controlled as a group via
the IPMI-based interfaces (IPMB) to the SAM. The IPMI interface is used for reporting faults,
events, and status.The shelf manager software performs management of the FTM via the IPMB
bus.The IPMC circuit provides temperature sensors for monitoring the temperatures of the
FTM board components and for monitoring the inlet and outlet air temperature of the shelf.
For further information, refer to Chapter 7, FRU Information and Sensor Data Records, on page
123
The upper FTM receives its signal and power connections from the backplane via a FTM
distribution board. A fan interconnect board connects the backplane to the FTM distribution
board. The FTMs are powered from -48VDC from the backplane. The lower FTM receives its
signal and power connections from the AdvancedTCA backplane. Only the lower FTM has an
air filter frame and filter in the module.
Table 5-4 PEM IPMB Addresses
Description IPMB Address
PEM A 0x66
PEM B 0x68