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LBI-39076B GLOSSARY
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GLOSSARY (CONT.)
Ground-Start Signaling ................................................Ground-Start signaling is used to send the local off-hook and on-hook
signals to the public telephone network. Off-hook is detected by the
presence of a DC loop current between one of the two wires of the 2-
Wire audio line and ground.
GTI Unit.......................................................................Global Telephone Interconnect Unit - the interface for one EDACS
repeater channel, and one telephone line, in a single unit.
GTI Configurator .........................................................The GTI Configurator is the office PC used to run the GTI Configurator
software.
GTI Configurator Software..........................................The GTI Configurator software is a PC-based, menu-driven program
that allows the system operator to set up the GTI(s) and optional IAM,
retrieve GTI call records, and monitor the system activity via a monitor
screen.
GTI Interface Board.....................................................The GTI Interface board is the interface between the Site Controller
computer and the Enhanced Local Interconnect (ELI) system. The GTI
Interface board is added to one GTI, making it the Master GTI.
IAM..............................................................................Interconnect Accounting Manager - The IAM is a microprocessor-
based, call-detail buffer containing two megabytes of battery-backed
RAM to provide storage for up to 60,000 interconnect calls.
Inbound Call ................................................................An inbound call is a call from a telephone to a radio. This is also
referred to as a telephone-originated call.
LED..............................................................................Light-Emitting Diode
LID...............................................................................Logical ID - a unique number used by a radio to work with an EDACS
system.
Line-Connected GTI ....................................................The line-connected GTI is the specific GTI unit connected to the
telephone line involved in the interconnect call being described.
Loop-Start Signaling....................................................Loop-Start signaling is used to send the local off-hook and on-hook
signals to the public telephone network. Off-hook is detected by the
presence of a DC loop current between the two wires of the 2-Wire
audio line.
M-Lead.........................................................................The M-Lead is a separate signaling wire associated with some 2-Wire
or 4-Wire audio lines, and is used to send the local off-hook and on-
hook signals to the public telephone network. Signaling is usually by
application or removal of ground or -48 Vdc.
Master GTI...................................................................The Master GTI is the specific GTI that has had the GTI Interface card
added.
PABX...........................................................................Private Automatic Branch Exchange
PCM.............................................................................Pulse Coded Modulation
PCM / Data Bus ...........................................................The PCM / Data Bus is used to connect the optional IAM (if present),
Master GTI, and all the standard GTI units together. It is actually made
up of an 8-bit parallel PCM Data bus, a serial Console Data bus, a serial
Subscriber Data bus, and a serial Repeater Data bus.
PSTN ...........................................................................Public Service Telephone Network