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Example of calculating system thermal output:

Watts DC/0.293 = BTU/hr

6283/0.293 = 21,444 BTU/hr

Documentation

T640 Power System Description on page 95•

• T640 DC Power System Electrical Specifications on page 125

• T640 DC Power Supply Electrical Specifications on page 126

• T640 General Electrical Safety Guidelines and Electrical Codes on page 529

T640 DC Power Distribution

Most sites distribute DC power through a main conduit that leads to frame-mounted DC

power distribution panels, one of which might be located at the top of the rack that

houses the router. A pair of cables (one input and one return) connects each set of

terminal studs to the power distribution panel.

NOTE: All inputs on the two-input 160-A DC power supply in slot PEM0 must

be powered by dedicated power feeds derived from feed A, and all inputs on

the two-input 160-A DC power supply in slot PEM1 must be powered by

dedicated power feeds derived from feed B. This configuration provides the

commonly deployed A/B feed redundancy for the system.

NOTE: INPUT 0 and INPUT 1 on the three-input 240-A DC power supply in

slot PEM0 must be powered by dedicated power feeds derived from feed A,

and INPUT 0 and INPUT 1 on the three-input 240-A DC power supply in slot

PEM1 must be powered by dedicated power feeds derived from feed B. This

configuration provides the commonly deployed A/B feed redundancy for the

system.

NOTE: All inputs on the four-input240-A DC powersupply in slotPEM0 must

be powered by dedicated power feeds derived from feed A, and all inputs on

the four-input 240-A DC power supply in slot PEM1 must be powered by

dedicated power feeds derived from feed B. This configuration provides the

commonly deployed A/B feed redundancy for the system.

NOTE: All inputs on the six-input DC power supply in slot PEM0 must be

the six-input DC power supply in slot PEM1 must be powered by dedicated

power feeds derived from feed B. This configuration provides the commonly

deployed A/B feed redundancy for the system.

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Juniper T640 Hardware Guide

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