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Power Supply Features
A lightning protection must be mounted at the place where the antenna cable enters the building. The primary
lightning protection must be capable of conducting all potentially dangerous electrical energy to PE (Protective
Earth).
Surge arrestors should support DC-pass and suitable for the GPS frequency range (1.575GHz) with low
attenuation.
• Antenna Sky visibility:
GPS signals can only be received on a direct line of sight between antenna and satellite. The antenna should
see as much as possible from the total sky. For proper timing, minimum of four satellites should be locked.
The antenna terminal should be earthed at the building entrance in accordance with the ANSI/NFPA 70,
Note
the National Electrical Code (NEC), in particular Section 820.93, Grounding of Outer Conductive Shield
of a Coaxial Cable.
Power Supply Features
The Cisco NCS 4216 supports DC power supplies. The DC power supplies support:
• -40 VDC to -72 VDC
The power supplies are hot-swappable. They are enclosed to prevent exposure to high voltages, and therefore,
no power cable interlock is required. However, the power supplies are automatically shut down when removed
from the chassis. The power supplies are rated to deliver 900W (~75A at +12VDC) to the other FRUs in the
system. The DC power supply has dual input feeds.
The following table shows the DC power supply specifications.
Table 2: DC Power Supply Specifications
Part numbers
Input power specification
Minimum input voltage
Maximum input voltage
Output voltage
Wire gauge for DC input power connections
Maximum power output
For more information about installing the Cisco NCS 4216 power supplies, see the
Cisco NCS 4216 Hardware Installation Guide
6
A900-PWR900-D2
48V, GND, -48V
-40.0 V
-72 VDC
+12 VDC
10 AWG minimum for -48/-60 VDC.
Connector accepts 6AWG maximum.
900 W
Installing the Power
Cisco NCS 4216 Overview
Supply.
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