Input-Power-Present Leds - Cisco CRS-1 System Description

DC Power System
Figure 2-6
1 Power supply B1 wiring block
2 Power supply B0 wiring block
3 Coupling screw

Input-Power-Present LEDs

The DC power Input-Power-Present LEDs provide a visual indication to service personnel that there is
voltage present across the input terminal's connection (see
the service person that there is power present.
Note Power should be disconnected before servicing the input power connections. Always check for
hazardous voltage with a multimeter device before servicing the unit.
Figure 2-7
The input-power-present LED starts to light up when the input voltage reaches 20 VDC; the LED gets
brighter as voltage increases. The input-power-present LED is fully lit when the input voltage reaches
38 VDC.
If an input-power-present LED is not lit, check for 1) the presence of voltage, and 2) the polarity of the
Note
corresponding wiring block.
Cisco CRS Carrier Routing System 4-Slot Line Card Chassis System Description
2-10
Power Input Module (PIM)
+
B 1
–
(R TN )
+
B 0
(-4 8V /-6
0V ) –
(R TN )
(-4 8V /-6
0V )
O N
S ID E B
B 1
B 0
1
2
Input-Power-Present LEDs
ON
B1 B0
+ B1 + B0
– –
(RTN) (-48V/-60V) (RTN) (-48V/-60V)
ON
B1 B0
S ID E A
A 1
3
4 Power supply A1 wiring block
5 Power supply A0 wiring block
6 Ground lug nuts
Figure
SIDE B
Chapter 2 Chassis Power System
+
A 1
–
(R TN )
+
O N A 0
(-4 8V /-6
0V ) –
(R TN )
(-4 8V /-6
0V )
A 0
4
5
6
2-7). The LED provides a warning to
ON
A1 A0
+ A1
–
(RTN) (-48V/-60V)
SIDE A ON
A1 A0
+ A0
–
(RTN) (-48V/-60V)
OL-10805-10