MAINTENANCE

Table 4-B lists the test points (-5 V, +5 V, -48 V, and GND) for the power supply. The test points are located on the upper-right corner at the front of the cabinet.

Table 4-Clists the voltages used by the CPs and symptoms that occur when voltages are missing. This information is useful in diagnosing power supply or power distribution problems.

Table 4-B. Power Supply Test Points

Test

Voltage

Remarks

Points

Limits

 

 

 

 

 

 

 

+5

+4.80

+5. 15

The green LED on the power supply

 

 

 

monitors this particular voltage

 

 

 

 

 

 

 

Ground

4-65

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ADTRAN 25 manual +4.80