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TELEPHONE EXCHANGE CSA
All customer lines and
payphone lines are connected to a Line Interface Circuit (LIC)
in the exchange. Early generation LIC provide line reversal
with the meter pulse being provided by an additional
hard-wired device called a SEPRM. Whilst later generation LIC
provide both line reversal and meter pulses. Irrespective of
the exchange type (AXE, S12) or LIC generation, CSA is always
a line reversal followed a short time later by the meter
pulse.
AXE conceptual block
diagram Layout
S12 Block Diagram Typical
Layout
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On
how obsolete Australian landline payphones work
on
CLM 12 and CLM 50
metering
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