Dc-Powered Router - Cisco ASR 9000 Series Installation Manual

DC-Powered Router

Figure 49: AC Power Cord PWR-CAB-AC-JPN=
DC-Powered Router
Connections to DC power modules are rated at 60 A maximum. The system accepts a nominal input voltage
of –48 VDC with an operational tolerance range of –40 VDC to –72 VDC. One dedicated, commensurately
rated DC power source is required for each power module connection.
Power redundancy requirements vary based on the system configuration (number and type of line cards, etc.).
DC-powered systems are N+1 protected. A minimum of two power supplies are required for redundant
operation. Refer to the Cisco ASR 9000 Power Calculator to determine actual redundancy requirements for
any given configuration. See:
Power connections to the power tray for each DC power module requires four cables: two source cables and
two return cables. In addition, each DC power tray requires one earth ground, so the minimum number of
cables for connecting a single DC power module in a power tray is five (two source, two return, one ground).
Note
A separate ground connection is not required for the version 2 and version 3 power systems. For more
information see
For DC power cables, we recommend that you use 60-A-rated, high-strand-count copper wire cables. The
length of the cables depends on your router location from the source power. DC power cables are not available
from Cisco, but they are available from any commercial cable vendor.
You must terminate DC power cables using cable lugs at the power tray end. Ensure that the lugs are dual-hole
and that they fit over M6 terminal studs at 0.625-inch (15.88-mm) centers. For #4 AWG cable, use Panduit
part number LCD4-14AF-L or equivalent; for #6 AWG, use Panduit part number LCD6-14AF-L or equivalent.
Warning
Hazardous voltage or energy may be present on power terminals. Always replace cover when terminals are
not in service. Be sure uninsulated conductors are not accessible when cover is in place. Statement 1086
Warning Only trained and qualified personnel should be allowed to install, replace, or service this equipment. Statement
1030
Cisco ASR 9000 Series Aggregation Services Router Hardware Installation Guide
38
http://tools.cisco.com/cpc/launch.jsp.
NEBS Supplemental Unit Bonding and Grounding Guidelines, on page
Preparing for Installation
44.