ARRIS Group Inc. MC9421 User Manual
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SBV5422 SURFboard Digital Voice Modem
UPS
An uninterruptible power supply provides a battery backup to enable voice service to
continue for some time during a power outage.
continue for some time during a power outage.
VoIP
Voice over Internet Protocol is a method to exchange voice, fax, and other information over
the Internet. Voice and fax have traditionally been carried over traditional telephone lines
using a dedicated circuit for each line. VoIP enables calls to travel as discrete data packets on
shared lines.
the Internet. Voice and fax have traditionally been carried over traditional telephone lines
using a dedicated circuit for each line. VoIP enables calls to travel as discrete data packets on
shared lines.