Users should ensure for their own protection that the electrical ground connections of the power utility, tele- phone lines and internal metallic water pipe system, if present, are connected together. This precaution may be particularly important in rural areas

CAUTIONS: Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection author- ity, or electrician, as appropriate.

If your telephone equipment causes harm to the telephone network, the telephone company may ask you to disconnect the system from the line until the problem has been corrected or they may discontinue your service temporarily. If possible, they will notify you in advance, But if advance notice is not practical, you should be notified as soon as possible. You will be informed of your right to file a com- plaint with the FCC.

Your telephone company may make changes in its facilities, equipment, operations, or procedures that could affect the proper functioning of your telephone system, If they do and it is possible, you will be notified in advance to give you an opportunity to maintain uninterrupted telephone ser- vice. If you experience trouble with this telephone system, disconnect it from the network until the problem has been corrected or until you are sure that the equipment is not mal- functioning.

Note: This equipment has been tested and found to comply with the limits for a class B digital device, pur- suant to local regulations. These lim- its are designed to provide reasonable protection against harmful interference in a residential installa- tion. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used

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Nortel Networks 7420 manual