1.1 Presentation
The Loop Start / Ground Start (LS/GS) board is also called Non Direct Dialing In (NDDI2-2)
board. It is an analog board which allows the Private Automatic Branch eXchange (PABX) to
be connected to most public networks. Furthermore, this board allows the PABX to be
connected to a pager system according to the ESPA standard.
The NDDI2-2 board can connect up to eight 2-wire analog lines. Lines 1 to 4 are processed on
the mother board and lines 5 to 8 are processed on the QATI-2 daughter board.
The NDDI2-2 board can handle the following optional daughter boards :
- Calling Line Identification Protocol Interface Adaptor (CLIPIA) board:
This board allows the line impedance to be modified to identify the caller and to detect the
metering pulses.
For more information on the CLIPIA board, see NDDI2-2(LS/GS) - CLIPIA Daugtherboard -
Operation .
- Tax Metering board:
This board is used to detect 12/16 KHz metering pulses.
For more information on the Tax Metering board, see NDDI2-2(LS/GS) - Metering
Detection Daughter Board .
- Ground Start board:
This board is used to seize the line via the ground and to detect incoming calls via
grounding a line wire.
Note:
The Ground Start board is only available in the US market.
Each daughter board is dedicated to 4 network lines, i.e. 2 daughter boards are necessary to
handle 8 lines of an NDDI2-2 board.
For more information on the NDDI2-2 board configuration, see NDDI2-2(LS/GS) - Hardware
configuration .
For more information on the NDDI2-2 board connection, see NDDI2-2(LS/GS) - External
connections .
1.2 Environment
The following figure shows the front and back panel connections of the NDDI2-2 board.
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