|
|
Virtual Private Network
an IP-based network that provides connectivity between two or more sites enabling enterprises to share information and applications privately. A VPN is established by creating a "tunnel" through the Internet on which private data (traffic) is carried. This requires, however, a high level of data encription and firewalls to prevent hackers from interfering with the private data transit. VPNs can be very slow because they are subjected to a number of "hops" over the internet depending on how the traffic is routed due to congestion.
|
|
 |
|
|
Voice over Digital Subscriber Line
Sending voice over a DSL line. Using compression, a large number of voice channels can be placed on DSL channels, which makes the technology very attractive. For example, up to 150 voice channels can be transmitted over a 1.5 Mbps DSL line. DSL signals at the customer side are delivered into an integrated access device (IAD), which forwards them over twisted pair to the carrier. The signals go to the carrier's DSLAM and then to an access switch that forwards voice to a voice gateway and then the PSTN and data to the appropriate data network.
|
|
|
|
|
|
Vacant Unconditioned Local Loop
A ULL which is not being used by Telstra or another Carriage Partner for the provision of telecommunication services to the end user.
|
|
|
|
Variable Bit Rate
Description of ATM PVCs, generally given a high precedence of transmission through PowerTel’s network
|
|
|
|
|
This enables a caller to leave a recorded message when the called party's telephone is engaged or does not answer.
|
|
|
|
Voice over Internet Protocol
A facility which enables the sending of real-time voice data in digital form, over the internet or other networks.
|
|
|
