Clear-Com FreeSpeak Beltpack - Manual (Page 76)

Clear-Com Communication Systems
Eclipse Glossary
7 - 2
Fiber-optic Cable A fiber-optic cable consists of a glass core covered
with a reflective material called “cladding” and several layers of buffer
coating to protect the cable from the environment. A laser sends light
pulses through the glass core to the other end of the cable.
FreeSpeak Digital wireless communications product. Sold under the
FreeSpeak name in Europe and Asia and CellCom in USA.
Full Duplex Refers to transmission of signals in two directions
simultaneously.
IFB “Interruptible Foldback”. The term “foldback” refers to sending
“program” audio, or some other audio mix, back to announcers while
they are on the air. Doing so allows announcers to monitor
themselves, other announcers, videotapes of commercials, or some
mix of sources, while they on the air. This is typically found in television
news and live broadcast events.
Announcers typically wear a small ear piece so they can hear the
selected foldback audio mix. When a director wants to give directions
to an announcer on air, or to announce changes in the program, the
director must “interrupt” the foldback. To do this, the director uses a
channel specifically set up to interrupt the foldback audio.
Interface Module A piece of electronic hardware designed to convert
the 4-wire signals of a central matrix port to some other form of
communication, such as 2-wire party line, telephone, etc. The interface
module is connected to a central matrix port. The external non-4-wire
device is then connected to the interface module.
ISO The ISO function, short for “panel ISOlation”, allows a panel
operator to call a destination and interrupt all of that destination’s other
audio paths and establish a private conversation. When the call is
completed the destination’s audio pathways are restored to their
original state before the interruption.
IV-R Instant Voice Router. Software that routes digital audio data
between Concert users and between Concert users and Eclipse
systems.
Label A label is an alphanumeric name of up to five characters that
identifies a source, destination, or control function accessed by an
intercom panel. Labels appear in the displays of the intercom panel.
Labels can identify panels, ports interfaced to other external
equipment, fixed groups, party lines, and special control functions.
Mode A term used to describe a light path through a fiber as in
multimode or single mode.
Multimode Fiber-optic Cable The glass core of a multimode fiber is
larger than the core of a single mode fiber, which causes the
transmitted light beam to disperse as it travels through the core. Single
mode fiber, with its smaller core, concentrates the light beam so that it
carries signals further. Multimode fiber was the first type of fiber offered