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(b) CPU (Central Processing Unit)
The Central Processing Unit is divided into two sections: common control
and speech path.
Common control: This section consists of a microcomputer and associated
other circuits. It controls receiving dial data from stations, opening and
closing of speech path, controlling of signal, paging and BGM switches in
accordance with the exchange program.
Speech path: This section consists of a voice switching circuit, signal
generator, link busy signal circuit, BGM amp and the paging amp. It is
controlled by the common control section.
control output
common
control
circuit
remote
control
link
(voice switching
circuit)
speech signal in
speech signal out
paging
signal
generator
link busy
BGM
dial
data
input
link
control
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