Multi-Tech Systems MVP 800 manual Glossary V

Glossary

V

V.25bis: An ITU-T standard for synchronous communications between a mainframe or host and a modem using HDLC or other character- oriented protocol.

V.54: The ITU-T standard for local and remote loopback tests in modems, DCEs and DTEs. The four basic tests are:

•local digital loopback (tests DTE send and receive circuits),

•local analog loopback (tests local modem operation),

•remote analog loopback (tests comm link to the remote modem), and

•remote digital loopback (tests remote modem operation).

Virtual Circuit: A logical connection. Used in packet switching wherein a logical connection is established between two devices at the start of transmission. All information packets follow the same route and arrive in sequence, but do not necessarily carry a complete address.

91