Cisco 7206VXR Installation Guide - Page 56

Preventing Electrostatic Discharge Damage, Site Requirements, AC and DC Power, Plant Wiring Guidelines

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Preventing Electrostatic Discharge Damage Chapter 2 Preparing for Installation Preventing Electrostatic Discharge Damage Electrostatic discharge (ESD) damage, which occurs when electronic cards or components are improperly handled, can result in complete or intermittent system failures. The network processing engine, I/O controller, and each port adapter consists of a printed circuit board that is fixed in a metal carrier. Electromagnetic interference (EMI) shielding, connectors, and a handle are integral components of the carrier. Although the carrier helps protect the boards, use an antistatic strap whenever handling the network processing engine, I/O controller, and port adapters. Handle the carriers by the handle and the carrier edges only; never touch the boards or connector pins. Caution Always tighten the captive installation screws on the network processing engine and I/O controller. (See Figure 1-4 and Figure 1-9.) These screws prevent accidental removal, provide proper grounding for the system, and help ensure that the bus connectors are properly seated in the midplane. Site Requirements Use this section for obtaining information about site requirements. AC and DC Power The AC-input power supply uses a power factor corrector that allows the Cisco 7206 to operate on input voltage and frequency within the ranges of 100 to 240 VAC and 50 to 60 Hz. Note We recommend attaching dual power supplies to independent power sources for full redundancy. We also recommend an uninterruptable power source to protect against power failures at your site. The DC-input power supply allows the Cisco 7206 router to operate at -48 VDC nominal in North America and -60 VDC in Europe. Refer to Table 1-1 in Chapter 1, "Product Overview" for system power specifications, including input voltage and operating frequency ranges. Plant Wiring Guidelines Following are guidelines for setting up the plant wiring and cabling at your site. When planning the location of the new system, consider the distance limitations for signaling, EMI, and connector compatibility, as described in the following sections. Interference Considerations 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 wiring practice can result in radio interference emanating from the plant wiring. Cisco 7206 Installation and Configuration Guide 2-2 OL-5102-02

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2-2
Cisco 7206 Installation and Configuration Guide
OL-5102-02
Chapter 2
Preparing for Installation
Preventing Electrostatic Discharge Damage
Preventing Electrostatic Discharge Damage
Electrostatic discharge (ESD) damage, which occurs when electronic cards or components are
improperly handled, can result in complete or intermittent system failures. The network processing
engine, I/O controller, and each port adapter consists of a printed circuit board that is fixed in a metal
carrier. Electromagnetic interference (EMI) shielding, connectors, and a handle are integral components
of the carrier. Although the carrier helps protect the boards, use an antistatic strap whenever handling
the network processing engine, I/O controller, and port adapters. Handle the carriers by the handle and
the carrier edges only; never touch the boards or connector pins.
Caution
Always tighten the captive installation screws on the network processing engine and I/O controller. (See
Figure 1-4
and
Figure 1-9
.) These screws prevent accidental removal, provide proper grounding for the
system, and help ensure that the bus connectors are properly seated in the midplane.
Site Requirements
Use this section for obtaining information about site requirements.
AC and DC Power
The AC-input power supply uses a power factor corrector that allows the Cisco 7206 to operate on input
voltage and frequency within the ranges of 100 to 240 VAC and 50 to 60 Hz.
Note
We recommend attaching dual power supplies to independent power sources for full redundancy. We also
recommend an uninterruptable power source to protect against power failures at your site.
The DC-input power supply allows the Cisco 7206 router to operate at –48 VDC nominal in North
America and –60 VDC in Europe.
Refer to
Table 1-1
in
Chapter 1, “Product Overview”
for system power specifications, including input
voltage and operating frequency ranges.
Plant Wiring Guidelines
Following are guidelines for setting up the plant wiring and cabling at your site. When planning the
location of the new system, consider the distance limitations for signaling, EMI, and connector
compatibility, as described in the following sections.
Interference Considerations
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 wiring practice can result in radio interference emanating from the plant wiring.