GE 21018 Guide De L'utilisateur page 41

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The telephone company may make changes in its communications
facilities, equipment, operations or procedures where such action is
required in the operation of its business. If these changes are expected to
affect the use or performance of your telephone equipment, the telephone
company will likely give you adequate notice to allow you to maintain
uninterrupted service.
Notice must be given to the telephone company upon termination of your
telephone from your line.
REN N
UMBER
On the bottom of this equipment is a label indicating, among other
information, the Ringer Equivalence Number (REN) for the equipment.
The REN is useful in determining the number of devices you may connect
to your telephone line and still have all of these devices ring when your
telephone number is called. In most (but not all) areas, the sum of the
RENs of all devices connected to one line should not exceed 5. To be
certain of the number of devices you may connect to your line as
determined by the REN, you should contact your local telephone company.
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