[Contents]
[Prev]
[Next]
[Report an Error]
Router Power Requirements
Table 9 lists the power requirements for
various hardware components when the router is operating under typical voltage
conditions. For PIC power requirements, see the M5 and M10 Internet Routers PIC Guide.
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
 |
If you plan to operate a maximally configured DC-powered router, we
recommend that you provision at least 13.5 A @ 48 VDC
and use a facility circuit breaker rated for 20 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 one power supply.
If you plan to operate a DC-powered router at less than the maximum
configuration and do not provision a 20 A circuit
breaker, we recommend that you provision a circuit breaker rated for at least
125% of the continuous current that the system draws at 48 V.
|
[Contents]
[Prev]
[Next]
[Report an Error]
