Control unit: Implements
board startup, self-test, status error reporting, N+1 switchover etc.
DISCO logic: Transmits
the data in the reception buffer to the UGATE of the NCM, or saves the data
from the UGATE into the sending buffer.
HDLC logic: Receives
the HDLC data frames from the CPM, NCM, SVICM or CDSU and save them into the
buffer, or takes data from the sending buffer, converts them into the HDLC
format and sends them to the CPM, NCM, SVICM or CDSU.
422 driving: Drives the
HDLC data code flow, even second and CHIP signals.
GLTP driving: Drives the
DISCO dual-bus data and control signals.
The NIM panel contains three
indicators and one reset button, as shown in Figure
RUN: A green indicator, blinking
when the board works normally.
ALM: A red indicator, blinking in
case of board failure.
ACT: A green indicator, lighting
up when the board is in active state.
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