Fan-Tray Assembly; Fan Speed - Cisco NCS 2006 Hardware Installation Manual

Installing the Cisco NCS 2002 Door and Other Modules

Fan-Tray Assembly

The fan-tray supported on the Cisco NCS 2002 shelf is FTA
The fan-tray assembly is installed on the left side of the NCS 2002 shelf. The fan-tray assembly is removable
and holds the fan-control circuitry and the fans for the NCS 2002 shelf.
There are four LEDs on the fan-tray assembly:
• Three alarm LEDs (CRIT, MAJ, and MIN) that indicate whether a critical, major, or minor alarm is
• One fan fail LED that indicates fan failure.
When the fan-tray assembly is not functioning and the power line is not connected, the LED is OFF. A red
LED indicates an alarm in the fan-tray assembly. A green LED indicates that the fan-tray assembly is
functioning, the power line is connected, and the power module is functioning properly, the LED is green.
When the power line is connected and if there is no TNC, TNCE, TSC, or TSCE card installed in the NCS
2002 shelf, then the LED is OFF.
The shelf controller card controls the conditions that result in triggering the LEDs. The LED can be overwritten
by the shelf controller card (TNC, TNCE, TSC, or TSCE) in all the three states (OFF/red/green). The fan-tray
assembly supports the lamp test procedure.
The fan-tray assembly has an LCD screen that provides slot and port-level information for all card slots, and
the number of critical, major, and minor alarms. The shelf controller card (TSC, TSCE, TNC, or TNCE) drives
the 16 X 2 character LCD screen. The LCD screen displays the shelf name, IP address, and software version
that is currently used. The display contrast is automatically adjusted for clear view. The three accessible push
buttons (SLOT, STATUS, and PORT) on the fan-tray assembly are used to set the slot and port level parameters.
The fan-tray assembly should be installed only after installing the power module. During the system startup
Note
or fan-tray replacement, the inventory data of the fan-tray assembly and the power module is displayed
in the Inventory tab of CTC after a delay of approximately 6 minutes.
After you install the fan-tray, you should only access it if a fan failure occurs. To clean and replace the fan-tray
assembly, see the "Maintain the Node" chapter in the Cisco NCS 2000 Series Network Configuration Guide
.
If the fan-tray assembly is removed from the shelf, wait for at least 5 seconds before plugging it back into
Note
the shelf. In the event the LCD display on the fan-tray assembly appears blank, remove the unit from the
shelf, wait for at least 5 seconds and reinsert the unit into the shelf.
A back-up flash memory is fitted into the fan-tray assembly to support the database (DB) and image back-up
in the single mode operation of the NCS 2002.

Fan Speed

Fan speed is controlled by the TNC, TNCE, TSC, or TSCE card temperature sensors. The sensors measure
the input air temperature at the fan-tray assembly. Fan speed options are low, medium, and high. If the TNC,
present anywhere on the NCS 2002 shelf.
Cisco NCS 2000 Series Hardware Installation Guide
Fan-Tray Assembly
131