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Overview
Power Supply and Fans
The Cisco NCS 4201 support either AC or DC power supplies in a 1+1 redundant configuration. The PSUs
are hot-swappable. Load is shared between PSUs when both the PSUs are inserted and powered-up. Status
LED provided on both AC and DC PSU indicates the status and output condition.
Table 3: Power Supply Specification
Specification
Voltage
Current
Input Power
Note
The Cisco NCS 4201 can have AC and DC PSUs in the same chassis.
Note
DC PSU can be switched on or off using a switch on the front panel of the DC PSU.
Note
For DC PSU, the UVP and OVP limits vary depending on the input voltage applied at power up: For -48/-60
V: UVP= -36 Vdc and OVP = -72 Vdc For 24 V: UVP =18 Vdc and OVP = 32 Vdc
Note
This product requires surge protection as part of the building installation. To comply with the Telcordia
GR-1089 NEBS standard for electromagnetic compatibility and safety, an external surge protective device
(SPD) is required at the AC power service equipment.
Note
For DC systems, if a surge of more than 1KV is expected, add an appropriate external surge protective device.
The Cisco NCS 4201 has removable fan tray as part of the system. The fan tray is hot-swappable. The system
is designed to operate at its maximum operating temperature of 70º C and at 65º C in case of failure of a single
fan, for a maximum of four hours.
LED Indicators
This section describes the different types of LEDs and their behavior.
AC
100 V – 240 V, 50/60Hz
2.6 A through a standard C16 type receptacle
260 W (ASR-920-PWR-A)
DC
-48/-60 V or 24 V
5.5 A –48/–60 V
11 A –24 V
through a two-position terminal block
260 W (ASR-920-PWR-D)
Cisco NCS 4201 Hardware Installation Guide
Power Supply and Fans
7
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