NS3000/iX NMMGR Screens Reference Manual - Edition 8 (36922-90038)

342 Glossary
Glossary
ThinLAN 3000/iX Link
Hardwareandsoftwarenecessary
to create a broadcast network,
which uses the IEEE 802.3 LAN
cable to transmit messages to all
the nodes on the network. The
messages are then accepted only
by the node or nodes to which
they are addressed. Also includes
the ThickLAN and StarLAN 10
options.
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.
token ring A collection of data
communicationsystems sharing a
common cable and
communicating by means of the
IEEE 802.5 protocol. In a token
ring network, access is controlled
by the passing of a token from
node to node. Outgoing messages
are attached to the token and
passed with the token until they
arrive at the node to which they
are addressed.
Token Ring 3000/iX Network
Link Hardware and software
required to connect a HP 3000
Series 900 system to a token ring
network.
topology The physical
arrangement of nodes in a
network. Some common
topologies are bus, star, and ring.
Transpac The national public
PSN of France.
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), detectserrors,
and retransmits messages if
errors have been detected.
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.