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Power

4.4 Battery Backup Units

The LEDs on the BBU (see Figure 4–2) display the status of the BBU. These

LEDs are controlled by internal BBU signals. The status LED has three states:

on, off, and ﬂashing. The charge status LED has two states: on or off. The valid

states of these LEDs are listed in Table 2–5

• The upper LED (green) is the BBU status LED.

• The lower LED (amber) is the charge status LED.

Figure 4–2 BBU LEDs

CHARGE

STATUS

(AMBER)

BBU STATUS

(GREEN)

CXO-3670A-PH

4–4 Power

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Digital Equipment Corporation Storage Works Guia do Utilizador Página 40