Table 46: M7I Component Power Requirements - Juniper M7i Hardware Manual

M7i Multiservice Edge Router Hardware Guide
80

Table 46: M7i Component Power Requirements

Component
Base system (cooling system, power supplies, and FIC)
CFEB/CFEB-E
CFEB/CFEB-E with Adaptive Services Module
CFEB-E with MultiServices Module
Routing Engine
You can use the information in
Interface Module Reference 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 CFEB + 1 RE + 1 PIC =
0.6 A + 1.4 A + 0.7 A + 0.625 A = 3.3 A @ 48 V = 159 W DC
Power consumption for maximum configuration:
Base system + 1 CFEB with ASM + 1 RE + 4 PICs =
0.6 A + 1.9 A + 0.7 A + 4(0.625 A) =
0.6 A + 1.9 A + 0.7 A + 2.5 A = 5.7 A @ 48 V = 274 W DC
Input current from a DC source other than –48 VDC (based on maximum configuration):
(–54 VDC input) x (input current X) = (–48 VDC) x (input current Y)
54 x X = 48 x 48.2
X = 48 x 48.2/54 = 42.8 A
System thermal output for maximally configured AC-powered router:
Watts DC/85% AC PEM efficiency/0.293 = BTU/hr
274/0.85/0.293 = 1100 BTU/hr
System thermal output for maximally configured DC-powered router:
Watts DC/0.293 = BTU/hr
274/0.293 = 935 BTU/hr
Power Requirement (Amps)@ 48
V
0.6 A
1.4 A
1.9 A
1.9 A
0.7 A
Table 46 on page 80 and the M7i Multiservice Edge Router
Copyright © 2019, Juniper Networks, Inc.