Clear-Com FreeSpeak Antenna Splitter - Manual (Page 199)

Clear-Com Communication Systems
Eclipse Glossary 1 3 - 3
by manufacturers. Single-mode fiber evolved as production methods
improved.
Multiplexing The process by which two or more signals are
transmitted over a single communications channel. Examples include
time division and wavelength division multiplexing.
Nanometer (nm) Common unit of measure for wavelength. One
billionth of a meter.
Non-volatile Memory Data stored in the CPU’s firmware (ROM) that
is not lost when the power is turned off.
Optical Signal A laser at one end of a fiber-optic cable pulses on or off
to send a light signal through the glass core of the cable to the other
end of the cable. Because the light signals are binary (on or off), the
signal is digital.
Panel Also referred to as “station” in some cases (usually older
manuals). Any intelligent intercom device connected to the rear-panel
analog ports of the central matrix. This term does not refer to devices
connected through interface modules.
Port Any of the input/output connections (RJ-45 connectors) on the
back panel of the central matrix. These connectors and the attached
cables connect the central matrix to remote intercom devices. The
term “port” emphasizes that the connection is a “portal” between the
central matrix and the remote intercom devices.
Program Any separate audio source that is fed into the intercom
channels. In television applications, for example, “program” audio is
the audio that is broadcast on air.
Rack Unit or RU Standardized unit of mounting space on a rack panel.
Each rack unit is 1.75 inches (44.45 mm) of vertical mounting space.
Therefore 1 RU is 1.75 inches (44.45 mm) of vertical mounting space,
2 RU is 3.5 inches (88.9 mm), 3 RU is 5.25 inches (133.35 mm), and
so on.
Remote Panel Any intelligent intercom device connected to the
back-panel ports of the central matrix. This term does not refer to
devices connected through interfaces.
Sidetone The sound of the panel operator’s own voice heard in their
own earphone as they speak.
Single-mode Fiber-optic Cable The glass core of a single-mode fiber
is smaller in diameter than the core of a multimode fiber, so that the
light signal transmitted over the core is more concentrated than with
multimode fiber, which allows the signal to travel further. Single-mode
fiber evolved from multimode fiber as production methods improved.
Source In this manual, the term “source” refers to a device—such as
an intercom panel, interface, or beltpack —that sends audio into the
matrix. The device to which audio is sent is called a “destination”.