Interference Considerations - Cisco Catalyst 8500 Series Hardware Installation Manual

Preparing Your Site for Installation
USB Serial Console
The USB serial console port connects directly to the USB connector of a PC using a USB Type A to 5-pin
mini USB Type-B cable. The USB Console supports full speed (12Mbps) operation. The console port does
not support hardware flow control.
Note • Always use shielded USB cables with a properly terminated shield. The USB serial console interface
• Only one console port can be active at a time. When a cable is plugged into the USB console port, the
• 4-pin micro USB Type-B connectors are easily confused with 5-pin micro USB Type-B connectors. Only

Interference Considerations

When wires are run for a significant distance, there is a risk that stray signals will be induced on the wires as
interference. If interference signals are strong, they can cause data errors or damage to the equipment.
The following sections describe sources of interference and how to minimize its effects on the Cisco Catalyst
8500 Series Edge Platforms.
Electromagnetic Interference
All the equipment powered by AC current can propagate electrical energy that can cause electromagnetic
interference (EMI) and possibly affect the operation of other equipment. The typical sources of EMI are
equipment power cords and power service cables from electric utility companies.
Strong EMI can destroy the signal drivers and receivers in the Cisco Catalyst 8500 Series Edge Platforms and
even create an electrical hazard by causing power surges through power lines into installed equipment. These
problems are rare, but could be catastrophic.
To resolve these problems, you need specialized knowledge and equipment, which could consume substantial
time and money. However, you should ensure that you have a properly grounded and shielded electrical
environment, paying special attention to the need for electrical surge suppression.
The following table lists electrode magnetic compliance standards for the Cisco Catalyst 8500 Series Edge
Platforms.
cable must not exceed 3 meters in length.
RJ-45 port becomes inactive. Conversely, when the USB cable is removed from the USB port, the RJ-45
port becomes active.
5-pin micro USB Type-B is supported.
Cisco Catalyst 8500 Series Edge Platforms Hardware Installation Guide
USB Serial Console
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