DLPI Programmer's Guide

Glossary 173
Glossary
Called DLS user The DLS
user in connection mode that
processes requests for
connections from other DLS
users.
Calling DLS user The DLS
user in connection mode that
initiates the establishment of a
data link connection.
Communication endpoint
The local communication
channel between a DLS user
and DLS provider.
Connection establishment
The phase in connection mode
that enables two DLS users to
create a data link connections
between them.
Connectionless mode A
mode of transfer in which data
is passed from one user to
another in self-contained units
with no logical relationship
required among the units.
Connection mode A circuit-
oriented mode of transfer in
which data is passed from one
user to another over an
established connection in a
sequenced manner.
Connection release The
phase in connection mode that
terminates a previously
established data link
connection.
Data link service data
unit A grouping of DLS user
data whose boundaries are
preserved from one end of a
data link connection to the
other.
Data transfer The phase in
connection and connectionless
mode that supports the transfer
of data between two DLS users.
DLSAP A point at which a DLS
user attached itself to a DLS
provider to access data link
services.
DLSAP address An identifier
used to differentiate and locate
specific DLS user access points
to a DLS provider.
DLS provider The data link
layer protocol that provides the
services of the Data Link