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TB9400 Installation and Operation Manual

© Tait Limited March 2015

This glossary contains an alphabetical list of terms and abbreviations 
related to the Tait P25 network and the TB9400 base station.

AAA commonly stands for Authentication, Authorization and Accounting. 
It refers to an IP-based security architecture that allows centralized, 
controlled access to devices in a network.

Analog-to-Digital Converter. A device for converting an analog signal to a 
digital signal that represents the same information.

Advanced Multiband Excitation. A voice compression technology patented 
by Digital Voice Systems, Inc and used in the vocoders of P25 radios. 

Automatic Number Identification. A service that provides the receiver of a 
call with a numerical identifier or alphanumeric label of the caller.

The Association of Public Safety Communications Officials in the United 
States. The APCO Project 25 standards committee defined the P25 digital 
radio standard. The standard is often referred to as APCO or P25.

Address Resolution Protocol is an IP protocol used to map IP network 
addresses to the hardware addresses used by a data link protocol. 

A radio receiver and transmitter that is located in a specific place (at a site) 
that enables a two-way radio to communicate with a dispatcher or over a 
larger range with other two-way radios. Specifically, Tait TB9400 
equipment in a subrack.

A PMU enters battery protection mode when it has AC power but its DC 
power is below the configured power shutdown voltage. In battery 
protection mode, the PMU will shut down to protect the battery if it loses 
AC power. 

Telecom equipment that is used to carry user data. 

Bit Error Rate. A measure of the quality of digital transmission, expressed 
as a percentage. The BER indicates the proportion of errors to correctly 
received digits in a received signal.