Shielded or unshielded network cables - A matter of choice, electromagnetic environment, and compatibility
A selected range of Axis products has undergone extensive RF emission tests with the result that the user
can choose between using unshielded, UTP, network cables and fulfill the Class A RF emission limits, or
using shielded, STP, network cables and fulfill the Class B RF emission limits.
Axis' recommendation is to deploy an STP network cable in demanding electrical environments. Examples
of demanding indoor environments are where the network cable is located in parallel with electrical
mains supply cables or where large inductive loads such as motors or contactors are in close vicinity to
the camera or its cable.
It is also mandatory to use an STP cable where the camera is used outdoors or where the network cable is
routed outdoors.
Most indoor surveillance deployments are done with an unshielded twisted-pair cable and that will be
sufficient to fulfill the regulatory requirements for the US market. The UTP network cable will provide lower
cable costs. Since it is less bulky and allows a simpler termination of the connector, it is also easier to
handle. These may all be principal factors for a customer.
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