Cisco 7920 Regulatory Compliance And Safety Information Manual page 72

These devices comply with Part 15 rules. Operation is subject to the
following two conditions:
1. This device may not cause harmful interference, and
2. This device must accept any interference received, including
interference that may cause undesired operation.
This equipment has been tested and found to comply with the limits of a Class
B digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when
the equipment is operated in a residential environment. This equipment
generates, uses, and radiates radio frequency energy, and if not installed and
used in accordance with the instructions, may cause harmful interference.
However, there is no guarantee that interference will not occur. If this
equipment does cause interference to radio or television reception, which can
be determined by turning the equipment off and on, the user is encouraged to
correct the interference by one of the following measures:
Reorient or relocate the receiving antenna.
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Increase separation between the equipment and receiver.
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Connect the equipment to an outlet on a circuit different from which the
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receiver is connected.
Consult the dealer or an experienced radio/TV technician.
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