ADC PG-FlexPlus PG-CAB001 Manual page 64

SCP-PGCAB001-010-01H July 19, 2004
DS1 – Lowest rate, standard digital telephony rate = 1.544 Mb/s, equivalent to 24 DS0s, occasionally used to
mean T1 format. Carried on separate transmit and receive twisted pairs.
E
E1 – Lowest rate, standard digital telephony rate = 2.048 Mb/s, equivalent to 30 DS0s. Carried on separate
transmit and receive twisted pairs
Erlang – Measure of percentage of DS0 lines in use for given system, where 1 Erlang = 100% of lines off-hook.
(See also Traffic Rate.)
F
FAP – Fuse and Alarm Panel
Fault Locating– Procedure, typically using dedicated twisted pairs from CO to RT, for finding a failure in a T1
carrier in the outside plant.
FDI – Feeder Distribution Interface—Also called a cross-connect.
Fiber Feeder– Optical, often SONET, interface from the CO to the RT.
G
GFCI – Ground Fault Circuit Interrupt. Used for AC convenience outlets to provide maximum personal protection
from electrical shock. Not suitable, however, for use with certain portable test equipment.
H
Hardened – Designed to higher-than-normal environmental specifications, specifically (for cabinets), designed
with -40 to +85°C rated components. (See also Uncontrolled environment.)
HX – Heat Exchanger, used in remote terminal cabinets to dissipate equipment heat to the outside environment
without mixing outside air with cabinet air.
I
ISDN – Integrated Services Digital Network
Integrated DLC – Newer architecture in which digital carrier (e.g. DS1) from remote terminals connects directly to
CO digital switch without conversion back to DS0; there is no Central Office Terminal.
L
LED – Light-emitting diode, a semi-conductor which emits light, used in displays such as meters, clocks,
calculators, etc.
LGX – Lightguide Cross-Connect, Lucent product family of fiber termination shelves and hardware.
Loop – The last part of the telecommunications circuit between the switch and the customer.
LVD/R – Low-Voltage Disconnect/Reconnect, component of the Cabinet Power System.
LW – Lightwave, typically LW multiplexer.
M
MCU – Monitor and Control Unit—A component of the Cabinet Power System.
Metallic – Using twisted pair wires or coax cable.
Metallic Feeder – Typically DS1 rate twisted pair interface from CO to RT.
Miscellaneous Pairs – Usually refers to dedicated twisted pairs from CO to RT enclosure which are not in the
transmission path and are used for test and troubleshooting. Typically include DC Test, Order Wire, and Fault
Locate Pairs.
52 ADC Telecommunications, Inc.