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Cisco ASR 1001-X Router Hardware Installation Guide
OL-32376-02
Chapter 3 Preparing Your Site for Installation
Site Planning
The extent of your network and the distances between network interface connections depend in part on
the following factors:
• Signal type
• Signal speed
• Transmission medium
The distance and rate limits referenced in the following sections are the IEEE-recommended maximum
speeds and distances for signaling purposes. Use this information as guidelines when planning your
network connections prior to installing the Cisco ASR 1001-X Router.
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.
Console Port Connections
The Cisco ASR 1001-X Router provides console and auxiliary ports to connect a terminal or computer
for local console access.
Both ports have RJ-45 connectors, support RS-232 asynchronous data, and have distance
recommendations specified in the IEEE RS-232 standard.
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
cable must not exceed 3 meters in length.
• Only one console port can be active at a time. When a cable is plugged into the USB console port,
the RJ-45 port becomes inactive. Conversely, when the USB cable is removed from the USB port,
the RJ-45 port becomes active.
• 4-pin mini USB Type-B connectors are easily confused with 5-pin mini USB Type-B connectors.
Only 5-pin mini USB Type-B is supported.
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
ASR 1001-X Router.