Asynchronous Serial Communications Programmer's Reference Manual (32022-90052)

328 Glossary
Glossary
class assignment, and other
values relevant to terminals
connected through a DTC.
terminal type A collection of
characteristics that cause a
terminal connected to an MPE/iX
system to act and react in a
specified manner. You can
configure a terminal to use one of
the system-supplied terminal
types, or you can create custom
terminal types using the
Workstation Configurator.
ThinLAN 3000/iX LAN that
conforms to the IEEE 802.3
Type 10 BASE 2 standard LAN.
throughput class A value
assigned to a given virtual circuit
that defines how many network
resources should be assigned to a
given call. It is determined by the
access line speed, packet and
window sizes, and the local
network’s internal mechanisms.
throughput class negotiation
One of the Network Subscribed
Facilities defined at subscription
time. This allows the user to
negotiate the Throughput Class
at call set-up time.
timer (T3) The length of time
that a link can remain in an idle
state. After the expiration of the
timer, the link is considered to be
in a non-active, non-operational
state and is automatically reset.
The value should be chosen
carefully. In particular, it must be
sufficiently greater than the
Retransmission Timer (T1) so
that no doubt exists about the
link’s state.
topology The physical
arrangement of nodes in a
network. Some common
topologies are bus, star, and ring.
Transmission Control
Protocol TCP. A network
protocol that establishes and
maintains connections between
nodes. TCP regulates the flow of
data, breaks messages into
smaller fragments if necessary
(and reassembles the fragments
at the destination), detects errors,
and retransmits messages if
errors have been detected.
Transpac The national public
PSN of France.
transparent mode A data
transfer scheme in which only a
limited number of special
characters retain their meaning
and are acted on by the system.
All other characters are
considered to be data and are
passed through with no control
actions being taken.
transport, network Software
that corresponds to layers 3 and 4
of the OSI network architecture
model. It sends data out over the
communications link, receives
incoming data, and routes
incoming or outgoing data to the
appropriate destination node.
TS8 See HP TS8.