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M120 Router Power Requirements
Table 1 lists the AC and DC power system electrical specifications. Table 2 lists the AC power supply electrical specifications. Table 3 lists the DC power supply electrical specifications. Table 4 lists the power requirements for various hardware components when the router is operating under typical voltage conditions. For PIC power requirements, see the M120 PIC Guide.
Table 1: Power System Electrical Specifications
Item | Specification |
|---|---|
AC input voltage | Operating range: 100 to 240 VAC |
AC input line frequency | 47 to 63 Hz |
AC system current rating (per power supply) | 28 A @ 100 VAC (15 A top inlet, 13 A bottom inlet) 14 A @ 240 VAC |
— | |
DC input voltage | Operating range: –40.0 to –72 VDC Note: If the input voltage from the DC power source drops below -37.5 to -39.5 VDC, the router automatically shuts down. During automatic shutdown, the circuit remains active. When the input voltage returns to –43.0 to –44.00 VDC, the router automatically starts up again and the system returns to normal operation within 30 minutes. No operator intervention is required. |
DC system current rating (per power supply) | 48 A @ –48 VDC (nominal) |
Table 2: AC Power Supply Electrical Specifications
Item | Specification |
|---|---|
Maximum output power | 2100 W |
AC input voltage | Operating range: 100 to 240 VAC (nominal) |
AC input line frequency | 47 to 63 Hz |
AC input current rating | 28 A @ 100 VAC (15 A top inlet, 13 A bottom inlet) 14 A @ 240 VAC |
Table 3: DC Power Supply Electrical Specifications
Item | Specification |
|---|---|
Maximum output power | 2100 W |
DC input voltage | Nominal: –48 VDC, –60 VDC Operating range: –40.0 to –72 VDC |
DC input current rating | 60 A @ –48 VDC |
Internal Supplementary Protector | 60 A |
Table 4: Component Power Requirements
Component | DC Power Requirement (Watts) | DC Current Requirement (Amps @ –48 VDC) |
|---|---|---|
Cooling system (normal speed) | 187 W | 3.90 A |
Cooling system (full speed) | 245 W | 5.11 A |
AC power supply | 114 W | Not applicable |
DC power supply | 17 W | 0.35 A |
FEB | 86 W | 1.79 A |
Type 1 FPC (without PICs) | 27 W | 0.56 A |
Type 2 FPC (without PICs) | 44 W | 0.92 A |
Type 3 FPC (without PICs) | 34 W | 0.72 A |
CFPCs | 54 W | 1.12 A |
CB (and craft interface) | 38 W | 0.78 A |
Routing Engine 1000 | 35 W | 0.74 A |
Routing Engine 1800 | 110 W | 2.3 A |
Routing Engine 2000 | 71 W | 1.48 A |
You can use the information in Table 4 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 a DC-powered router. These examples use generalized values for PICs. For PIC power requirements, see the M120 PIC Guide.
- Power consumption for minimum configuration:Cooling system (normal speed) + 1 host subsystem with RE1000 + 1 Type 1 FPC + 1 FEB + 1 Type 1 PIC =3.90 A + 1.52 A + 0.69 A + 1.79 A + 0.56 A = 8.46 A @ –48 VDC = 406 W DC
- Power consumption for maximum DC-powered configuration
:Cooling system (high speed) + 2 host subsystems with RE2000 + 2 CFPC + 4 Type 2 FPCs + 6 FEBs + 16 Type 2 PICs =5.11 A + 2 (1.48 A + .78 A) + 2 (1.12) + 4(0.92 A) + 6(1.79 A) + 16(1.05 A) =5.11 A + 4.52 A + 2.24 A + 3.68 A + 10.74 A + 16.8 A = 43.09 A @ –48 VDC = 2,068 W DC
- System thermal output for maximally configured DC-powered
router:Watts DC * 3.41 = BTU/hr2,068 * 3.41 = 7052 BTU/hr
- System thermal output for maximally configured AC-powered
router:(Watts DC / AC power supply 110V input 85% efficiency) * 3.41 = BTU/hr(2,068 / 0.85) * 3.41= 8296 BTU/hr(Watts DC / AC power supply 220V input 89% efficiency) * 3.41 = BTU/hr2,068/ 0.89) * 3.41 = 7923 BTU/hr
- Current requirement adjustment for fans running at full
speed (high temperature environment or cooling component failure):Calculated system current (X) – Cooling (normal) + Cooling (full speed) =X A – 3.90 A + 5.11 A =X A + 1.21 A
- Input current from a DC source other than –48 VDC
(based on maximum configuration; 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 43.1 AX = 48 x 43.1 A/54 = 38.3 A
