Technical data

LED Indicators
14-Slot Shelf
Chapter 2
93
Alarm Display Panel Temperature Sensor
The LM75 temperature sensor measuring the board temperature is located on the ADP PCB. The
temperature sensor is connected to the Master-Only I²C-bus.
Fan Trays
The 14 Slot ATCA Shelf contains three interchangeable Fan Trays. The Fan Trays are plugged in at the rear
top of the Shelf and can be removed by lifting the retention lever.
Each Fan Tray contains three radial fans for cooling the front boards. The fan speeds are monitored by a
tachometer signal sent from the Fan Trays to the Shelf Manager. The Shelf Manager regulates the fan speed
with a DC voltage. The display module at the Fan Tray provides:
• A blue Hot-Swap LED.
•A red Fan Tray Alarm LED.
•A green Fan Tray OK LED.
• A Hot-Swap push button.
The Fan Tray, its display module, and the fan tray numbering scheme are shown in Figure 2-9, Figure 2-10,
and Table 2-10.
3 LED_USER3 Signal to User definable LED3 on Shelf Alarm Display
4 LED_MIN Signal to Minor Alarm LED on Shelf Alarm Display
5 LED_MAJ Signal to Major Alarm LED on Shelf Alarm Display
6 LED_CRIT Signal to Critical Alarm LED on Shelf Alarm Display
7 RST_PB Signal from Alarm Cutoff Push Button on Shelf Alarm Display
8 GND Ground
9 SCL_CH0 Serial Clock Master – Only I²C-Bus Channel 0
10 SDA_CH0 Serial Data master – Only I²C–Bus Channel 0
11 GND Ground
12 ADP_PRES ADP Presence Signal (Grounded on DAP)
13 INT# External Interrupt Request (Master – Only I²C–bus devices
14 GND Ground
15
I
2
C_PWR_B
3.3 VDC power supply for Shelf I²C–bus devices
16
I
2
C_PWR_A
3.3 VDC power supply for Shelf I²C-bus devices
Table 2-9 Alarm Connector Panel Horizontal Board Connector Pin Assignment
Pin Signal Name Description