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Table 45: Power Specifications for a 2000 W DC Power Supply Used in an EX8208 Switch
SpecificationsItem
•
Minimum operating voltage:–40 VDC
•
Nominal operating voltage:–48 VDC
•
Operating voltagerange: –40 VDC through–72VDC
NOTE: Ifthe input voltagefrom the DC powersource drops below –37.5VDCthrough–39.5
VDC,the switching platform automatically shuts down.During automaticshutdown,the
circuitremains active. Whenthe input voltagereturns to–43 VDC through–44 VDC, the
switch automaticallystartsup again and the system returnstonormal operationwithin 30
minutes.No operatorinterventionis required.
DC input voltage
50 A maximumat nominal operating voltage(–48 VDC) foreach input terminal.DC input currentrating
2000 WOutput power
100 AInternalFuse Protection
Related Topics DC Power Supply in an EX8200 Switch on page 48•
• DC Power Supply LEDs in an EX8200 Switch on page 50
Power Requirements for EX8208 Switch Components
Table 46 on page 111 lists the power requirements for different hardware components
of an EX8208 switch under typical voltage conditions.
Table 46: EX8208 Switch Component Power Requirements
PowerRequirements(Watts)Components
•
300 W (atnormal fanspeed)
•
1100 W (atmaximum fanspeed)
Fantray
200 WSwitchFabric and RoutingEngine (SRE) module
100 WSwitch Fabric(SF) module
450W8-portSFP+line card(including opticaltransceivers)
550 W40-portSFP+line card(including opticaltransceivers)
330 W48-portSFP line card(including opticaltransceivers)
350 W48-portRJ-45line card
Related Topics AC Power Supply in an EX8200 Switch on page 40•
• DC Power Supply in an EX8200 Switch on page 48
111Copyright©2010, JuniperNetworks, Inc.
Chapter7:PlanningPowerRequirements