Dell Latitude D400 User Manual page 221

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The REN is used to determine the quantity of devices that may be
connected to the telephone line. Excessive RENs on the telephone line may
result in the devices not ringing in response to an incoming call. In most
areas, the sum of all the RENs on your telephone line should be less than
five to ensure proper service from the telephone company. To be certain of
the number of devices that you may connect to a line, as determined by the
total RENs, contact your local telephone company.
The registration jack Universal Service Order Code (USOC) used by this
equipment is RJ-11C. An FCC compliant telephone cord and modular plug
is provided with this equipment. This equipment is designed to be
connected to the telephone network or premises wiring using a compatible
modular jack that is Part 68 compliant.
This equipment cannot be used on public coin-phone service provided by
the telephone company. Connection to party line service is subject to state
tariffs.
There are no user serviceable parts on the modem contained in your
computer.
If your telephone equipment causes harm to the telephone network, the
telephone company will notify you in advance that service may be
temporarily discontinued. If advance notice is not practical, the telephone
company will notify you as soon as possible. Also, you will be advised of your
right to file a complaint with the FCC if you believe it is necessary.
The telephone company may make changes in its facilities, equipment,
operations, or procedures that could affect the operation of this equipment.
If this happens, the telephone company will provide advance notice in order
for you to make necessary modifications to maintain uninterrupted service.
If you experience trouble with this telephone equipment, see "Contacting
Dell" to find the appropriate telephone number for obtaining customer
assistance. If the equipment is causing harm to the telephone network, the
telephone company may request that you disconnect the equipment until
the problem is resolved.
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Appendix