Radio Shack 43-329 - Manual (Page 53)

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The plug and jack used to connect this equipment to premises wiring and
the telephone network must comply with applicable Part 68 rules and
technical requirements adopted by ACTA. A compliant telephone cord and
modular plug is provided with this product. It is designed to be connected
to a compatible modular jack that is also compliant. An RJ11 jack should
normally be used for connecting to a single line and an RJ14 jack for two
lines. See Installation Instructions in the user’s manual.
The Ringer Equivalence Number (REN) is used to determine how many
devices you may connect to your telephone line and still have them ring
when you are called. The REN for this product is encoded as the 6th and
7th characters following the US: in the product identifier (e.g., if ## is 03,
the REN is 0.3). In most, but not all areas, the sum of all RENs should be
five (5.0) or less. For more information, please contact your local telephone
company.
This equipment may not be used with Party Lines. If you have specially
wired alarm dialing equipment connected to your telephone line, ensure
the connection of this equipment does not disable your alarm equipment.
If you have questions about what will disable alarm equipment, consult your
telephone company or a qualified installer.
If this equipment is malfunctioning, it must be unplugged from the modular
jack until the problem has been corrected. Repairs to this telephone
equipment can only be made by the manufacturer or its authorized agents.
For repair procedures, follow the instructions outlined under the Limited
Warranty.