The technologies of an analog and a digital jack are very different and are not
compliant. Analog modems
use a standard phone line to gain remote access; where as, a digital
jack is reserved to be used with an ISDN line or PBX switch. A NIC or
a transceiver can burn out if it is exposed to the voltages of an
analog phone line. Likewise, an analog modem can be damaged if it is plugged into a digital jack.
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