4b3t U Interface CircuitSTU2071 (UIC) provides two transparent 64 kbit/s
B channels, a transparent 16 kbit/s D channel, a
transparent 1 kbit/s service channel and a 1 kbit/s
maintenance channel for loop and error mes-
sages on subscriber lines.
UIC enables full duplex continuous data transmis-
sion via the standard twisted pair telephone ca-
ble. Adaptive Echo cancellation is used to restore
the received data. An equalizer, done with an
adaptive Filter restores the data which are dis-
torted by the transmission line.
The coefficient of the equalizer and echo cancel-
ler are conserved during a power down. An all
digital PLL performs both bit and frame synchroni-
zation.
The Analog front end consists of receive path RX
and transmit path TX, providing a full duplex ana-
log interfacing to the twisted pair telephone cable.
Before data are converted to Analog signals, they
pass through a digital Filter (TX-filter) to reduce
the high frequency components. After D/A con-
version the signal is amplified and sent to the hy-
brid . By STMicroelectronics
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