ATTO Technology 2400C/R/D - Manual (Page 13)

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no link is present. A separate blinking yellow LED
indicates activity. A bicolor Ready/Fault LED lights green to indicate
ready, lights yellow to show a faulted condition, and is
off to indicate not ready.
Exhibit 1.3-1 The FibreBridge 2390C connectors and LEDS.
Exhibit 1.3-2 The FibreBridge 2390C board layout.