Cooling S ys tem (Fan T ra ys )
I-Ga te 4000 P R O Ins tall ation
7-2
Veraz Networks Inc. Proprietary
02041802-05
7.1. Fan Operation
The fan tray's circuit board provides fan status information (either Go or No-Go) via
the communication star bus controller. This information is sent to the TPSM or
TPSM-R1 central controller of the I-Gate 4000 PRO
,
which performs regular polling
of the fans. If a fan fails, a No-Go condition exists in one of the fans, and an alarm
indication is sent from the fan tray module to the I-Gate 4000 PRO System
Controller. In this event you should replace the entire fan tray.
There are two conditions that affect a change of speed in the fans:
!
Overheating of the cards:
Each of the system cards have a heat sensor. If the
temperature threshold is exceeded in any one of the cards, an alarm is sent to the
TPSM/TPSM-R1 controller, which instructs the fans to operate at a higher
speed.
!
Fan malfunction:
In a fan malfunction scenario, the TPSM/TPSM-R1 controller
instructs the failed fan to stop operation and a LED indication of the specific
failed fan is displayed on the front panel of the Fan Tray (see Table 7-1). In
addition, a command is sent to the fans that are operating normally to increase
their speed so as to compensate for the failed fan.
Table
7-1: Fan Tray Status LEDs
Fan Location
Fan Status
LED Indication
Active Green
Left Rear
Fail Red
Active Green
Left Front
Fail Red
Active Green
Right Rear
Fail Red
Active Green
Right Front
Fail Red
The fan tray module is connected with a 25-pin D-type connector to the I-Gate 4000
PRO backplane (see Figure 7-3).