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.

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.