Chapter 9: Glossary
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Synchronisation and Training
This is the modem initialisation process defined by the G.994.1 (G.hs
handshaking) recommendation. This process, if successful, ends in the state
known as ‘showtime’.
VPI/VCI
The ATM Virtual Path Identifier (VPI) and Virtual Channel Identifier (VCI) uniquely
identify a data path on an ATM link. An ATM switch (or other device incorporating
ATM switching capability like a DSLAM or BAS) can be configured to take data
from one VPI/VCI on an incoming link and map it to another VPI/VCI on an
outgoing link. This configuration defines the route through the ATM switch. Note
that this means that a particular data connection may be given many different
VPI/VCI ‘addresses’ as it passes through the network.
