6.1 Overview
The Ground Start daughter board reference is 3BA 23196 AA.
The Ground Start daughter board installed on the NDDI2-2 (LS/GS) board is a “Line
Adaptation” which allows to seize the line via the ground and to detect incoming calls via
grounding a line wire. This board is equipped for Ground Start signaling (only available in the
US market).
A Ground Start daughter board is dedicated to 4 network lines. You need 2 Ground Start
daughter boards on the NDDI2-2 (LS/GS) board.
The Ground Start daughter board has no strappings.
For more information on the Ground Start daughter board connection, see NDDI2-2(LS/GS) -
External connections .
6.2 Operation
The ground is sent on the Ring wire and detected on the Tip wire.
The Ground Start board has:
- two control points:
• CET (Terminal State Command) Earth commands connection to the ground on the
Ring wire (1 for connection),
• CET Earth Det On commands connection to the ground on the Tip wire (1 for
connection).
The ground detector may be disconnected during all off-hook phase and dialing phase.
The disconnection may be generated by ground detector during the conversation phase.
- one scan point, OET (Terminal State Scan) B-DET, which indicates the presence of the
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6-1
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