If you are using a copper cable to connect the Redundancy Ports (RPs) back-to-back, the maximum length of
the cable can be 30 meters. If you want to use a longer cable, you will need to switchover to fiber optic cables.
Note
Console Port Connections
The Cisco Catalyst CW9800H1 and CW9800H2 Wireless Controllers provides console ports to connect a
terminal or computer for local console access.
The RJ-45 connector 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 any USB form type to
5-pin USB Type-B cable. The USB Console supports full speed (12Mbps) operation. The console port does
not support hardware flow control.
• 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 USB Type-B connectors are easily confused with 5-pin USB Type-B connectors. Only 5-pin USB
Type-B is supported.
Note
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 controller.
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 controller 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.
Cisco Catalyst CW9800H1 and CW9800H2 Wireless Controllers Hardware Installation Guide
38
Preparing Your Site for Installation
Console Port Connections
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