GL-6
GLOSSARY
hard-wired
Wired directly from the main distribution frame (MDF) to an
information outlet (IO) that bypasses an intermediate distribution
frame (IDF).
headset
A device, substituting for a handset, that combines an earphone and
mouthpiece in an arrangement to be worn on the user’s head. A
headset is used mostly by employees who must have their hands free
for duties other than answering calls.
heat coil
homerun
horizontal subsystem
hybrid circuit packs
hybrid terminal
A device that overheats from low currents (0.3A to 5.0A) and
grounds a conductor.
Heat coils are supplementary electrical
protectors used to protect against sneak current caused by power
crosses, power inductions, and ground potential rise.
Installation cable that runs from the main distribution frame (MDF)
in the equipment room to the information outlet (IO) at the
workstation without a cross-connection in a satellite closet.
See
installation cable.
The circuit packs installed in the port carriers to serve hybrid
terminals.
A telephone with multiple features that requires one wire pair for
analog voice transmissions and two wire pairs for digital-control
transmissions.
information outlet (IO)
The wall jack at an employee’s desk that his or her terminal plugs
into. The IO is connected to the intermediate distribution field (IDF)
by installation cabling.
IROB
insert labels
in-range, out-of-building
Labels inserted into the designations strips of the 110A terminal
blocks to identify a cable and its leads when the cable is terminated
on a main distribution frame (MDF) or an intermediate distribution
frame (IDF).
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