If wires exceed recommended distances, or if wires pass between buildings, give special consideration to the
effect of a lightning strike in your vicinity. The electromagnetic pulse caused by lightning or other high-energy
phenomena can easily couple enough energy into unshielded conductors to destroy electronic devices. If you
have had problems of this sort in the past, you may want to consult experts in electrical surge suppression and
shielding.
Asynchronous Terminal Connections
The route processors provide a console port to connect a terminal or computer for local console access. The
route processors also provide an auxiliary port for additional connections and for diagnostic use.
Both ports have RJ-45 connectors, support RS-232 asynchronous data, and have distance recommendations
specified in the IEEE RS-232 standard.
Interference Considerations
When wires are run for any 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 ASR
1000 Series Router system.
Electromagnetic Interference
All 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 ASR 1000 Series Router 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 ASR 1000 Series Routers.
Table 44: EMC Standards
FCC 47 CFR Part 15 Class AEMC Standards
VCCI Class A
AS/NSZ Class A
ICES-003 Class A
EN55022/CISPR 22 Information Technology
Equipment (Emissions)
Cisco ASR 1000 Series Router Hardware Installation Guide
126
Preparing Your Site for Installation
Site Cabling Guidelines
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