Juniper Networks M5 - Manual (Page 64)

Power Guidelines, Requirements, and Specifications
Table 9: Component Power Requirements
Component
Power Requirement
(Watts) Power Requirement
(Amps)
Base system (all components except PICs,
with fans running at normal speed) 188 (approximate) 4 A/48 V
(approximate)
Fans running at full speed (additional power
required) 40 (approximate) 0.833 A/48 V
Routing Engine 17 0.2 A/48 V
FEB 50 1.1 A/48 V
You can use the information in Table 9 and the M5 and M10 Internet Routers PIC Guide to
calculate power consumption for various hardware configurations, input current from a
different source voltage, and thermal output, as shown in the following examples. (For an
added safety margin, the examples use a generalized value for PICs of 0.625 A/48 V each.)
•
Power consumption for minimum configuration:
Base system + 1 FEB + 1 Routing Engine + 1 PIC =
4 A + 1.1 A + + 0.2 A + 0.625 A = 5.925 A @ 48 V = 284 W DC
•
Power consumption for maximum configuration (M5 router):
Base system + 1 FEB + 1 Routing Engine + 4 PICs =
4 A + 1.1 A + 0.2 A + 4(0.625 A) =
4 A + 1.1 A + 0.2 A + 2.5 A = 9.6 A @ 48 V = 461 W DC
•
Power consumption for maximum configuration (M10 router):
Base system + 1 FEB + 1 Routing Engine + 8 PICs =
4 A + 1.1 A + 0.2 A + 8(0.625 A) =
4 A + 1.1 A + 0.2 A + 5 A = 10.3 A @ 48 V = 494 W DC
•
Input current from a DC source other than 48 V (based on maximally configured M10
router; applies to DC power supply only):
(54 VDC input) x (input current X) = (48 VDC input) x (input current Y)
54 x X = 48 x 10.3 A
X = 48 x 10.3 A / 54 = 9.1 A
•
System thermal output for maximally configured AC-powered M10 router:
Watts DC/85% AC PEM efficiency/0.293 = BTU/hr
494/0.85/0.293 = 1984 BTU/hr
•
System thermal output for maximally configured DC-powered M10 router:
Watts DC/0.293 = BTU/hr
494/0.293 = 1686 BTU/hr
44 M5 and M10 Internet Routers Hardware Guide