Cisco Cisco Packet Data Gateway (PDG) Documentation Roadmaps
ST16 Hardware Platform Overview
▀ Power Filter Units
▄ Cisco ASR 5000 Series Product Overview
OL-22937-01
Power Filter Units
Located at the bottom rear of the chassis are slots for two Power Filter Unit (PFU) assemblies. Each PFU provides DC
power from the Central Office (CO) battery sub-system to the chassis and its associated cards. Each load-sharing PFU
operates independently of the other to ensure maximum power feed redundancy. The maximum input operating voltage
range of the PFU is -40 VDC to -60 VDC; the nominal rage is -48 VDC to -60 VDC.
power from the Central Office (CO) battery sub-system to the chassis and its associated cards. Each load-sharing PFU
operates independently of the other to ensure maximum power feed redundancy. The maximum input operating voltage
range of the PFU is -40 VDC to -60 VDC; the nominal rage is -48 VDC to -60 VDC.
Important:
In the event that the CO has AC power only, a separate rack mount AC to DC converter is required.
There are two versions of the PFU. The versions are differentiated by the current rating of the circuit breakers: 125 amp
and 165 amp. Older versions of the ST16 chassis use the 125A PFU. Newer versions of the ST16 chassis use the 165A
PFU.
and 165 amp. Older versions of the ST16 chassis use the 125A PFU. Newer versions of the ST16 chassis use the 165A
PFU.
Caution:
125A and 165A PFUs are not interchangeable. Both PFUs installed in chassis must be of
the same type.
The following drawing shows the PFU and its connectors. Refer to the Cabling the Power Filter Units chapter for
information on installing and cabling the PF.
information on installing and cabling the PF.
Figure 16. Power Filter Unit
../../../GRAPHICS/Production/ST-series_Hardware/PFUv2.wmf
Table 7. Power Filter Unit Component Descriptions
Item
Description
1
Plastic terminal cover
2
VDC (-48 VDC input terminals)
3
RTN (voltage return terminals)
4
Power filter unit handle
5
Circuit breaker (On/Off) rated at either 125A or 165A depending on chassis requirements
6
Power LED (See Hardware Installation Guide for details.)