Compaq Armada V300 Series Reference Manual page 182

Always follow these basic safety precautions when using a
modem or telephone that is not cordless.
!
This equipment complies with Part 68 of the FCC rules. Located
on the bottom of the computer is a label that contains, among
other information, the FCC Registration Number and Ringer
Equivalence Number (REN) for this equipment. Upon request,
you must provide this information to your telephone company.
The REN is useful to determine the quantity of devices you may
connect to your telephone line and still have all of those devices
ring when your telephone number is called. In most areas (but not
all), the sum of the RENs of all devices connected to one line
should not exceed five (5.0). To be certain of the number of
devices you may connect to your telephone line, as determined by
the REN, you should contact your local telephone company to
determine the maximum REN for your calling area.
The REN for this device does not exceed 1.0.