M7i Router Power Requirements
Table 1 lists the power requirements for various hardware components when the router is operating under typical voltage conditions. For PIC power requirements, see the M7i Multiservice Edge Router PIC Guide.
Table 1: M7i Component Power Requirements
Component | Power Requirement (Amps)@ 48 V |
|---|---|
Base system (cooling system, power supplies, and FIC) | 0.6 A |
CFEB/CFEB-E | 1.4 A |
CFEB/CFEB-E with Adaptive Services Module | 1.9 A |
CFEB-E with MultiServices Module | 1.9 A |
Routing Engine | 0.7 A |
You can use the information in Table 1 and the M7i Multiservice Edge Router 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 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 48.2X = 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/hr274/0.85/0.293 = 1100 BTU/hr
- System thermal output for maximally configured DC-powered
router:Watts DC/0.293 = BTU/hr274/0.293 = 935 BTU/hr
Note: We recommend that you provision at least 13.5 A @ 48 VDC and use a facility circuit breaker rated for 15 A minimum. Doing so enables you to operate the router in any configuration without upgrading the power infrastructure, and allows the router to function at full capacity using multiple power supplies.
