Technical data

32 Brocade VDX 6720 Hardware Reference Manual

53-1002084-06

Replacing a combined FRU in a Brocade VDX 6720-24

You can use external labels as a guide. The power supplies and fan assemblies are labeled with an

airflow symbol on the faceplate to indicate whether the assembly takes in or exhausts air. The

symbol also appears on the top of the FRU. All FRUs in a chassis must have the same label affixed

so that airflow direction is consistent. Figure 11 illustrates examples of the airflow labels.

FIGURE 11 Examples of airflow symbols

The green E symbol indicates an exhaust FRU. This unit pulls air in from the port side of the switch

and exhausts it out the non-port side. This is called front-to-back airflow or forward airflow. This

symbol should appear on FRUs with part numbers ending with -F.

The orange I symbol indicates an intake FRU. This unit pulls air in from the non-port side of the

switch and exhausts it out the port side. This is called back-to-front airflow or reverse airflow. This

symbol should appear on FRUs with part numbers ending with -R.

The show environment fan command will indicate either “forward” or “reverse” airflow.

Replacing a combined FRU in a Brocade VDX 6720-24

Figure 12 shows the two combined AC power supply and fan assemblies in the Brocade VDX

6720-24. The Network OS identifies the FRUs from left to right as power supply and fan assembly

#2 and power supply and fan assembly #1. Figure 13 shows the combined DC power supply and

fan assemblies.

FIGURE 12 Brocade VDX 6720-24 AC power supply and fan assemblies on the non-port side

AIRFLOW

1 Power supply and fan assembly #2 5 Handle

2 AC power cord receptacle 6 Airflow label

3 Status LED 7 Captive screw

4 On/off switch 8 Power supply and fan assembly #1