What is a volts direct current signal as it relates to telecommunications?
Ask the expert
Do you have a question for Matt Brunk or any of our other experts? Ask your enterprise-specific questions today! (All questions are treated anonymously.)
Negative 48 volts direct current (-48VDC) is typically found on landlines in an idle state. When someone calls a phone number, an AC current of 90 volt-ampere current (90 VAC) is applied to the loop to make the phone ring. The term -48VDC is typically referred to as talk battery in the worlds of plain old telephone service, or POTS, and public switched telephone networks, or PSTNs. From here, the volts direct current expands to channel banks, multiplexers and numerous other wares. Volts direct current is found in numerous technologies because digital gear often deals with stepped-down and lower-DC voltages than a typical AC house current.
Learn more about volts direct current:
Dig Deeper on Unified Communications Architecture and Service Models
Related Q&A from Matt Brunk
How does VoIP Quality of Service compare between cable and DSL? Telephony Expert Matt Brunk explains that broadband Internet type doesn't necessarily... Continue Reading
When it comes to UC and VoIP equipment, there is no one-size-fits-all for enterprises, according to telephony expert Matt Brunk. Brunk explains how ... Continue Reading
Telecom expert Matt Brunk explains the role FCC regulations play in corporate communications, from Title 47 regulations to issues like net neutrality. Continue Reading