IBM 3745 Series Connection And Integration Manual page 148

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transmission line. The physical means for
connecting two or more DTEs (via DCEs). It can
be nonswitched or switched.
tributary modem. On a multipoint connection or
a point-to-point connection using basic mode link
control, any modem other than the control modem.
See also secondary modem.
user access area. A specific area in the
controller where the customer can install, remove,
change, or swap LlCs and TICs by himself.
user application network. A configuration of
data processing products, such as processors,
controllers, and terminals, for data processing and
information exchange. This configuration may use
circuit-switched, packet-switched, and
leased-circuit seN ices provided by carriers or
PTT. Also called a user network.
Virtual Telecommunications Access Unit
(VTAM*). A set of programs that maintain control
of the communication between terminals and
application programs running under operating
systems (DOS, OS/2).
V.24, V.25, V.25bis, V.35. ITU-T
recommendations on telecommunication physical
interfaces.
X.20bis, X.21, X.21 bis, X.24. ITU-T
recommendations on network access protocols
and interfaces.
Glossary
X-7