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151
General Glossary
E&M
(Ear and Mouth
Signaling)
E&M (Ear and Mouth) signaling originated from early telephone systems
to provide a means of establishing calls between exchanges. Modern
systems do not use E&M signaling and use either in-band signaling or
dedicated data channels to set up calls. E&M leads are now commonly
used as multipurpose signaling connections. To avoid confusion, the
terms E and M are often replaced by SO (Signaling Out) and SI
(Signaling In) throughout this manual set.
ESD
Electrostatic Discharge
Gain
A figure used to describe amplification. For example, an amplifier with a
gain of two will produce an output signal that is twice the amplitude of an
input signal.
Handshaking
Handshaking is a term used to describe the signaling lines (RTS, CTS,
etc.) of serial communication links such as RS-232.
iDEN
Integrated Digital Enhanced Network, a technology built by Motorola
that combines trunked radio and cellular phone features.
IRR
(Instant Recall
Recorder)
IRR is an application used to control the voice recording process.
MAP27
A protocol used to access trunked radios.
MDC-1200
A low-speed data system for two-way radios that allows features such as
radio status, emergency messages, and selective calling.
PTT
“Push to talk” or “press to talk”.
RX
Receive
SDC
Sprint Direct Connect, a technology by Sprint that combines traditional
trunked radio features with traditional cellular phone features.
Transceiver
A circuit that can connect to a shared bus for the purpose of receiving and
transmitting. A cooperative protocol for the bus ensures that only one
transceiver on a bus transmits at any one time.
TX
Transmit
UMS
(User Management
System)
UMS is a client/server application used to control system access and
privileges.
VF
(Voice Frequency)
An audio signal in the band 300-3400 Hz.
Name
Description
Содержание 4000 Sereis
Страница 1: ...Series 4000 Communication Control System Operation Version 5 6 025 9535L...
Страница 7: ...7 Contents Appendix A Glossary 149 Paging Glossary 149 General Glossary 150 Index 153...
Страница 8: ...Contents 8 025 9535L...
Страница 16: ...Introduction 16 025 9535L...
Страница 99: ...99 Operation Figure 23 iDEN Status Select Submenu Figure 24 iDEN Status Select Subwindow...
Страница 123: ...123 Operation Figure 47 MAP27 Dynamic Group Selection Submenu Figure 48 MAP27 Dynamic Group Selection Subwindow...
Страница 139: ...139 Operation Figure 58 MDC 1200 Status Selection Submenu Figure 59 MDC 1200 Status Selection Subwindow...
Страница 152: ...Appendix A Glossary 152 025 9535L...