1–General Description
Chassis Controls and LEDs
59265-02 B 1-3
Heartbeat LED (Green)
The Heartbeat LED indicates the status of the internal switch processor and the
results of the power-on self test (POST). Following a normal power-up, the
Heartbeat LED blinks approximately once per second to indicate that the switch
passed the POST and that the internal switch processor is running. In
maintenance mode, the Heartbeat LED remains lit. Refer to “Heartbeat LED Blink
Patterns” on page 4-3 for more information about Heartbeat LED blink patterns.
System Fault LED (Amber)
The System Fault LED lights up to indicate that a fault exists in the switch
firmware or hardware. Fault conditions include POST errors, over-temperature
conditions, and power supply malfunctions. The Heartbeat LED shows a blink
code for POST errors and over temperature conditions. For more information,
refer to “Heartbeat LED Blink Patterns” on page 4-3.
Maintenance Button
The Maintenance button, shown in Figure 1-2, is a dual-function momentary
switch on the front panel. Press the maintenance button to reset the switch, or to
place the switch in maintenance mode. Maintenance mode sets the IP address to
10.0.0.1 and provides access to the switch for maintenance purposes when flash
memory or the resident configuration file has been corrupted. For more
information, see “Recovering a Switch Using Maintenance Mode” on page4-13.

Resetting a Switch

To reset the switch, use a pointed tool to press and hold the Maintenance button
for less than two seconds. The switch responds as follows:
1. All the chassis LEDs light up except the System Fault LED.
2. After approximately one minute, the POST begins, extinguishing the
Heartbeat LED.
3. When the POST is complete, the Input Power LED lights up, and the
Heartbeat LED flashes once per second.

Placing the Switch in Maintenance Mode

To place the switch in maintenance mode:
1. Isolate the switch from the fabric.
2. Using a pointed tool, press and hold the Maintenance button for a few
seconds until only the Heartbeat LED is lit. Hold the maintenance button
until the Heartbeat LED goes out, and then release the button. The
Heartbeat LED remains lit while the switch is in maintenance mode.
To exit maintenance mode, and return to normal operation, press the
Maintenance button momentarily.