Voice over Internet Protocol, or VoIP, telephone products connect to VoIP, or Internet telephony, systems, which use packet-switched telephony to transmit calls over the Internet as opposed to the circuit-switched telephony used by the traditional Public Switched Telephone Network (PSTN).
VoIP telephones look and largely function like standard phones, but they have built-in IP technology and an RJ-45 Ethernet connector instead of the standard RJ-11 phone connector that enables the VoIP phone to connect directly to a router for making and receiving IP calls. A standard phone can also function as a VoIP telephone when used with an analog-to-digital converter called an ATA, or analog telephone adaptor. Another option is to bypass the phone entirely and simply use a VoIP-capable computer to make and receive IP calls.
See “The Difference Between VoIP and PSTN Systems” in the Did You Know… section of
- volatile memory
Memory that loses its contents when the power is turned off. All RAM except the CMOS RAM used for the BIOS is volatile. ROM, on the other hand, is nonvolatile.
The tape volume serial number or VOLSER is the method used to uniquely identify a tape volume. The VOLSER is specified in the tape label, which is the first set of information contained on the tape. [Source: Audit Serve]
- voltage regulator
(n.) A small device or circuit that regulates the voltage fed to the microprocessor. The power supply of most PCs generates power at 5 volts but most microprocessors require a voltage below 3.5 volts. The voltage regulator’s job is to reduce the 5 volt signal to the lower voltage required by the microprocessor. Typically, voltage […]
A fixed amount of storage on a disk or tape. The term volume is often used as a synonym for the storage medium itself, but it is possible for a single disk to contain more than one volume or for a volume to span more than one disk.
- volume label
In DOS systems, the name of a volume (that is, the name of a disk or tape). Specifying a volume label makes it easier to keep track of what data is stored on each medium.