Cisco 7507 And Cisco 7507-Mx Power Considerations - Cisco 7500 Series Configuration Manual

AC-Input and DC-Input Power Guidelines
The 600W DC-input power supply allows the Cisco 7505 to operate between –40 and –52 VDC in North
America (–48 VDC nominal) and between –56 and –72 VDC in the European Union (–60 VDC
nominal). We recommend that you use an 8-AWG, highly flexible stranded cable for the DC power
connections. (See
The Cisco 7505 installation must comply with all applicable codes and is approved for use with copper
Note
conductors only. The ground bond fastening hardware should be of compatible material and preclude
loosening, deterioration, and electrochemical corrosion of hardware and joined material. Attachment of
the chassis ground to the central office or other interior ground system should be made with a 6-AWG,
copper ground conductor at a minimum. The Cisco 7505 chassis employs two threaded M5 chassis
grounding receptacles, which are intended to be bonded directly to the central office or other interior
ground system. These receptacles are located on the rear of the chassis. The chassis ground requires M5
screws and locking hardware, which are not included.

Cisco 7507 and Cisco 7507-MX Power Considerations

The 700W AC-input power supply for the Cisco 7507 and Cisco 7507-MX routers uses a power factor
corrector (PFC) that allows it to operate on input voltage and current within the range of 100 through
240 VAC and 47 through 63 Hz. The 700W DC-input power supply allows the Cisco 7507 and Cisco
7507-MX to operate between –40 and –72 VDC (–48 VDC nominal). We recommend that you use an
8-AWG, highly flexible stranded cable for the DC power connections. (See
a list of Cisco 7507 and Cisco 7507-MX power specifications.)
The Cisco 7507 or Cisco 7507-MX installation must comply with all applicable codes and is approved
Note
for use with copper conductors only. The ground bond fastening hardware should be of compatible
material and preclude loosening, deterioration, and electrochemical corrosion of hardware and joined
material. Attachment of the chassis ground to the central office or other interior ground system should
be made with a 6-AWG, copper ground conductor at a minimum. The Cisco 7507 and Cisco 7507-MX
chassis employs two threaded M5 chassis grounding receptacles, which are intended to be bonded
directly to the central office or other interior ground system. These receptacles are located on the rear of
the chassis. The chassis ground requires M5 screws and locking hardware, which are not included.
A second, identical power supply is also present in routers configured with the redundant power option;
this ensures that power to the chassis continues uninterrupted if one power supply fails. It also provides
uninterrupted power if the input power line fails, but only if the power supplies are connected to separate
input lines.
Whenever possible, provide redundant power sources for each power supply installed in the chassis. For
AC-input installations, install an uninterruptible power source where possible. Install proper grounding
to avoid damage from lightning and power surges.
If only one input line is available, and you must connect both power supplies to the same source, the
redundant power supply will provide continuous power if the first power supply fails. It cannot provide
power backup if the input power fails.
Warning This unit might have more than one power cord. To reduce the risk of electric shock, disconnect the
two power supply cords before servicing the unit.
Cisco 7500 Series Installation and Configuration Guide
2-8
Table 1-1 for a list of Cisco 7505 power specifications.)
Chapter 2 Preparing for Installation
Table 1-2 and Table 1-3for
OL-5008-03 B0