User's Manual

Table Of Contents
DRAFT 4
126 TaitNet P25 Glossary TB9400 Installation and Operation Manual
© Tait Electronics Limited September 2011
TELCO Telephone company.
TIA Telecommunications Industry Association
toggle Describes the switching between two states. If something is on, toggling it
turns it off. If it is off, toggling it turns it on.
tone A sound wave of a particular frequency.
TSBK A Trunking Signaling Block is an over-the-air message format used in digital
P25 mode for setting up trunked calls and for supplementary services such
as messaging and status updates.
Tx Transm i tter.
U
UDP User Datagram Protocol. A simple protocol on top of IP for sending streams
of data.
uninhibit A control command that can be sent across the CAI to restore an inhibited
SU to normal functioning.
uplink The transmission path from SUs to fixed equipment.
UTC Coordinated Universal Time (word order from French). An international
time standard that has replaced Greenwich Mean Time.
V
valid signal A signal that the receiver unmutes to. A signal is valid, for example, when it
is strong enough to be decoded and when it has the specified NAC.
voice stream A digitized voice signal that passes through the main switch.
VoIP Voice over IP. The name for the technology that puts speech signals in
packets and then routes them over an IP backbone network.
voting The systematic sampling of a group of channels for the channel with the
greatest signal strength. Voting provides wide-area coverage and ensures that