22
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 dual-tone receiver
nThe
hybrid junction (2 wire - 4 wire interface)
nAn
A/D converter (uses PCM techniques at 64 kbps)