Technical data

LED Indicators
14-Slot Shelf
Chapter 2
97
Fan Tray Temperature Sensor
The temperature sensors (LM75) in the Fan Trays measure the exhaust temperatures of the Shelf. The
temperature sensors are connected to Channel 3 of the Master-Only I²C-bus.
Fan Tray Control Board SEEPROM
The SEEPROM on the Fan Tray control board stores the FRU data and is connected to Channel 3 of the
Master-Only I²C-bus.
Fan Tray Connectors and Indicators
Table 2-12, Figure 2-12, and Table 2-13 provide information on the fan tray LED indicators and backplane
connector.
Figure 2-12 Fan Tray Backplane Connector
Table 2-12 LEDs on the Fan Tray Control Panel
Color Description
Blue Hot-Swap LED
Red Alarm LED
Green Fan tray OK LED
Table 2-13 Fan Tray Backplane Connector Pin Assignment
Pin Number Signal Pin Number Signal
1
I
2
C_PWER_A
13 GND
2
I
²
C_PWR_B
14 FANTRAY_PRESENT
3SCL 15HA0
4SDA 16HA1
5LED_FT_OK 17INT#
6LED_FT_FAIL 18
7 19 VRTN_B
8 FAN_TK3 20 VRTN_A