MaxTech xpvs336i - Manual (Page 22)

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to a telephone loop which is used by the device, to prevent
overloading. The termination on a loop may consist of any
combination of devices subject only to the requirement that the
sum of the Load Numbers of all the devices does not exceed
100.
UL Notice
Caution: This internal modem adapter is to be installed in UL
Listed computers only, Always disconnect the modem adapter
from the telephone system during installation or when the cover
is removed from the computer.
First Edition GZ/DR - Version 1.0