Chapter 2 Preparing for Installation
AC-Input and DC-Input Power Guidelines
Cisco 7513, Cisco 7513-MX, and Cisco 7576 Power Considerations
The 1200W AC-input power supply in the Cisco 7513, Cisco 7513-MX, and Cisco 7576 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. Follow these precautions and recommendations when planning power connections to the router. (See Table 1-4for a list of Cisco 7513 power specifications, Table 1-5for a list of Cisco 7513-MX power specifications, and Table 1-6for a list of Cisco 7576 power specifications.)
Note Wiring codes prevent 20A plugs from being used with most equipment rack power strips. The Cisco 7513, Cisco 7513-MX, or Cisco 7576 installation must comply with all applicable codes. The ground bond fastening hardware should be of compatible material and preclude loosening, deterioration, and electrochemical corrosion of hardware and joined material. Installation is approved for use with copper conductors only. Attachment of the chassis ground receptacles to the central office or other interior ground system should be made with a 6-AWG, copper ground conductor at a minimum. The Cisco 7513, Cisco 7513-MX, and Cisco 7576 chassis employ two threaded M5 chassis grounding receptacles. These receptacles are intended to be bonded directly to the central office or other interior ground system and are located on the rear of the chassis. The chassis grounding receptacles require 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 that 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.
An AC-input-powered Cisco 7513, Cisco 7513-MX, or Cisco 7576 operating at 120 VAC requires a minimum of 20A service, with a 20A receptacle at the power source. The power cable supplied with the chassis uses a 20A plug. Figure 2-5shows cable features required to connect the 20A plug to your AC source.
Cisco 7500 Series Installation and Configuration Guide
