Glossary
HST-3000 Ethernet Testing User’s Guide
323
TCP window size — The
maximum number of bytes that
a port can transmit over a TCP
connection before being
acknowledged by the receiving
port.
Terminate — An application
where the test set is terminating
the circuit. In these applications,
the test set sends and receives
traffic.
Thru — An application where
the test set is used in series with
a network circuit to monitor the
traffic on that circuit.
ToS — Type of service. When
you configure the HST to
transmit pings, you can option-
ally specify the type of service
using the Advanced button on
the PING tab.
TTL — Time to live. Time after
which a fragmented ping
request or response can be
deleted by any device on a
circuit. When you configure the
HST to transmit pings, you can
optionally specify the TTL value
in seconds using the Advanced
button on the PING tab.
Tx — Transmit.
U
UDP — User Datagram
Protocol. Layer 4 protocol that
offers a limited amount of
service when messages are
exchanged between devices in
an IP network. UDP uses IP to
transmit data from one device to
another device; however, unlike
TCP, UDP does not divide a
message into packets, and then
reassemble the packets at the
far end.
V
VLAN — Virtual LAN.
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