When sections of the subscriber line network
are digitalised, this is at the same
time involves the removal of certain of
the functions of the subscriber stage.
You saw an example of this in the previous
chapter. In its purest form, a whole
subscriber stage is transferred out onto
the network, so-called remote subscriber
stage. Within this are functions for.....
A/D conversion
Power supply
to subscriber telephones
Signaling
to/from subscribers , e.g. reception of the tone signals which make
up the B-number, and the
ringing signal to the subscriber
Test access
for measurements on the subscriber lines
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