CHAPTER 7
Power System Components and
Descriptions
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T640 Power System Description on page 95
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T640 Two-Input 160-A DC Power Supply Description on page 96
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T640 Two-Input 160-A DC Power Supply LEDs on page 98
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T640 Three-Input 240-A DC Power Supply Description on page 99
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T640 Three-Input 240-A DC Power Supply LEDs on page 100
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T640 Four-Input 240-A DC Power Supply Description on page 102
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T640 Four-Input 240-A DC Power Supply LEDs on page 103
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T640 Six-Input DC Power Supply Description on page 104
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T640 Six-Input DC Power Supply LEDs on page 105
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T640 Three-Phase Delta and Wye AC Power Supply Description on page 106
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T640 Three-Phase Delta and Wye AC Power Supply LEDs on page 109
T640 Power System Description
The router supports two load-sharing DC power supplies, located at the lower rear of
the chassis. The power supplies connect to the midplane, which distributes different
output voltages produced by the power supply to the router components, depending on
voltage requirements.
The T640 router supports the DC power supplies in Table 51 on page 96.
NOTE: Mixing power supplies with a different number of inputs in the same
router is supported only during upgrade. Mixing different types of power
supplies is not supported during normal operations.
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