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160 GLOSSARY
V.34 An ITU standard that currently allows data rates as high as 28,800 bps.
V.34+ An enhancement to V.34 that enables transfer rates as high as 33, 600 bps.
V.90 V.90 is the ITU standard which allows modems to receive data at up to 56Kbps
over the standard, public switched telephone network (PSTN). V.90 technology
exploits the digital connections that most Internet and on-line service providers
use at their end to connect to the PSTN, such as a T1 or an ISDN BRI line.
VPN A virtual private network is a secure, private data network that is established over
the Internet, resulting in cost savings by using local, toll free access numbers. Also,
because the existing Internet backbone is used, there is less investment needed in
private network infrastructure.