Line interface circuit components
nOver-voltage
protection
nTest
equipment to connect to monitor the line condition faults
nVoltage
feed
nringing
ntelephone
current supply
nDetection
of
nhook stage,
pulse generated, or DTM receiver
nThe
hybrid junction (2.wire - 4 wire interface)
nAn
A/D converter (uses PCM techniques at 64 kbps)