Cisco Systems 7500 Series manual Plant Wiring Guidelines, Interference Considerations with Cabling

Chapter 2 Preparing for Installation

Plant Wiring Guidelines

Figure 2-5 20A AC-Input Power Cable Connector, Plug, and Receptacle (Cisco 7513, Cisco 7513-MX, and Cisco 7576)

		H3164
IEC 320 20-amp connector	20-amp plug	20-amp receptacle
(to the AC power supply)

The DC-powered chassis requires a minimum 35A dedicated service (at –48 VDC). We recommend that you use an 8-AWG, highly flexible stranded cable for the DC power connections. Figure 2-6shows the conductor preparations.

Figure 2-6

DC-Input Power Cable Connection to Terminal Block (Cisco 7513, Cisco 7513-MX, and

End View

Cisco 7576)

.925

.83

Maximum exposed conductor surface

All measurements in inches

.39 .210

.140

8-AWG conductor

.610		H3814
	Crimp area

Plant Wiring Guidelines

This section provides guidelines for setting up the plant wiring and cabling at your site. When planning the location of the new system, consider wiring issues, distance limitations for signaling, electromagnetic interference, and connector compatibility, as described in the sections that follow.

Interference Considerations with Cabling

When wires are run for any significant distance in an electromagnetic field, interference can occur between the field and the signals on the wires. This fact has two implications for the construction of plant wiring:

•Bad practices can result in radio interference emanating from the plant wiring.

•Strong electromagnetic interference (EMI), especially as caused by lightning or radio transmitters, can destroy the signal drivers and receivers in the router, and can even create an electrical hazard by conducting power surges through lines and into equipment. (Review the safety warnings in the “Safety Recommendations” section on page 2-2.)

	Cisco 7500 Series Installation and Configuration Guide
2-10	OL-5008-03 B0