Chapter 1- Hardware Description
Table 
Component | LED ID | LED Color | Description  | 
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CNTL Unit | ERR  | Red  | ON - Major system error. In case of  | 
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  | an active alarm this light is ON, and  | 
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  | the RDY green is OFF.  | 
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  | OFF - Normal.  | 
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  | Flashes - During system startup.  | 
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  | RDY  | Green  | ON - CPU card has successfully  | 
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  | completed startup. This light turns  | 
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  | green after completing the entire  | 
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  | system configuration.  | 
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  | OFF - Turns OFF when the ERR  | 
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  | red LED is activated.  | 
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  | Flashes - During system startup.  | 
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  | ACT | Amber  | ON - At least one endpoint is  | 
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  | connected to the system.  | 
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  | Flashes - During system startup.  | 
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  | HD  | Red  | OFF - Normal.  | 
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  | Flashes - Hard disk is active.  | 
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  | HS  | Blue  | Flashes - Indicates when the  | 
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  | power down process is initiated on  | 
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  | an MPM/MPM/MPMx + card. This  | 
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  | LED flashes in synchronization  | 
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  | with the MPM/MPM+/MPMx’s  | 
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  | cards HS LED.  | 
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  | OFF - Normal  | 
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  | ON - CPU may be removed.  | 
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