User`s guide

4.2 Environmental Monitor Unit (EMU) Functions

Once the SW300 enclosure is powered up, it will operate normally until a fault

condition is detected by the EMU.

In addition to the fault bus functions provided by the fault clock, fault data, and

device swap signals, the EMU performs the following functions during routine

operations:

• Monitors and controls the cabinet blowers

• Monitors the power supplies

• Senses cabinet temperature

• Monitors the power supply voltage

If the EMU detects a fault condition, it will respond as follows:

• Turns on the appropriate LED on the EMU panel

• Turns on the Fault (amber) LED located on the upper right corner on the

front of the SW300

• Activates the audible alarm

For further discussion on EMU functions, refer to Chapter 1.

4.3 EMU Control Panel LEDs and Fault Notiﬁcations

As shown in Figure 4–2, the front panel LEDs display information when the

SW300 enclosure is powered up or encounters a problem. Table 4–2 lists the

EMU control panel buttons and LEDs, their functions, and error code meanings.

Figure 4–2 EMU Control Panel LEDs and Switches

BLOWERS

AUDIBLE

ALARM SWITCH

SYSTEM OK

TEMPERATURE

SHELF FAULT

CXO-4310A-MC

Error Analysis and Fault Isolation 4–3