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ROI-S04488
2.7
Analog Service Channel Signal Transmission (Optional)
2.7.1
ASC Transmit Side
2.7.2
ASC Receive Side
2.8
9.6 K Digital Service Channel Transmission
An analog service channel (ASC) transmission is performed in the ASC
INTFC section, which provides the pulse code modulation codec (PCM
CODEC) and PCM decodec (PCM DECOD) circuits.
transmission is described in accordance with transmission side and receive
side, respectively.
An analog signal applied to the ASC IN terminal is passed on to PCM
CODEC circuit. An analog signal is converted into a 80 kbps (approx.)
digital signal at the PCM CODEC circuit by 10 kHz (approx.) timing pulse
and 80 kHz (approx.) clock signal received from the MAIN BOARD. The
converted digital signal is fed to the MAIN BOARD.
The 80 kbps (approx.) digital signal received from the MAIN BOARD is
applied to the PCM DECOD circuit. This 80 kbps (approx.) bps digital
signal is converted into an analog signal by the 10 kHz (approx.) timing
pulse and 80 kHz (approx.) clock signal, and then the analog signal is fed
to the ASC OUT terminal.
The 9.6 K digital service channel (DSC) transmission is explained in the
following section:
TRANSMISSION
CHANNEL
DSC 1 and DSC 2− MAIN BOARD
FUNCTIONAL OPERATION
The ASC
2-23
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