CHAPTER 10
DC Power Requirements and
Specifications
•
T640 DC Power System Electrical Specifications on page 125
•
T640 DC Power Supply Electrical Specifications on page 126
•
T640 DC Power System Requirements on page 128
•
T640 DC Power Distribution on page 130
•
T640 DC Power Cable and Lug Specifications on page 132
T640 DC Power System Electrical Specifications
Table 67 on page 125 lists the power system electrical specifications.
Table 67: T640 Power System Electrical Specifications
SpecificationItem
Operating range: –40.0 to –72.0 VDC
NOTE: If the input voltage from the DC power
source drops below –37.5 to –39.5 VDC, the
router automatically shuts down. During
automatic shutdown, the circuit remains active.
When the input voltage returns to –43.0 to
–44.0 VDC, the router automatically starts up
again and the system returns to normal
operation within 30 minutes. No operator
intervention is required.
DC input voltage
152 A @ –48 VDC (nominal) (7296 W)DC system current rating
Related
Documentation
T640 Power System Description on page 95•
• T640 DC Power Supply Electrical Specifications on page 126
• T640 DC Power System Requirements on page 128
• Maintaining the T640 Power Supplies on page 456
• T640 General Electrical Safety Guidelines and Electrical Codes on page 529
125Copyright © 2017, Juniper Networks, Inc.
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