Avaya 6424D+M User Manual page 167

distribution cable
DS1/MFAT carrier
enhanced primary protector
extra-large building entrance
terminal (XLBET)
foreign exchange (FX)
frame
fusible link
gas tube
ground-potential rise
The cable that connects the main distribution frame (MDF) to an
intermediate distribution frame (IDF., When the cable is run between
floors in the same building, it is caIled riser, house, or backbone
cable. When the cable runs from the MDF in one building to an IDF
in another building, it is called campus cable. Distribution cable is
also known as black cable because of the heavy polyvinyl chloride
(PVC) protective covering that it is normally encased in.
The carrier in the port cabinet that holds digital service 1 (DS1)
circuit packs and multifunction analog terminal (MFAT) circuit
packs. It also can hold the same circuit packs that the universal port
carrier can hold.
A protector that operates at a lower voltage or current threshold than
a primary protector.
A frame manufactured by the AT&T Service Center in Los Angeles
to hold terminal blocks for main distribution frames (MDFs) and
intermediate distribution frames (IDFs). The Service Center
manufactures the XLBET in several models.
A central office (CO) other than the one located in the calling
customer area.
A metal structure used to hold arrangements of cross-connect blocks.
A short length of fine gauge wire that melts when subjected to an
electrical current exceeding 5A. It is used as a primary protector
against ground-potential rise and power crosses.
A device containing a sealed special gas used to protect against
high-voltage surges. Gas tubes are used as primary electrical
protectors against lightning, ground potential rise, and power crosses.
They reset themselves for a limited number of times depending upon
the duration of surges.
A voltage, conducted through the earth to the grounding point for a
switch and its cabling, that exceeds the voltage being discharged into
the earth by the switch and cable grounds. Ground-potential rise is
usually caused by a lightning strike or a severe power fault nearby.
GL-5
GLOSSARY