LXT332 Datasheet, PDF (4/32 Pages) Level One – Dual T1/E1 Line Interface Unit with Crystal-less Attenuation

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TRSTE DI Tristate Output Enable Input Pin. Forces all output pins to high-Z tri-state
when held High. Enables Bipolar I/O mode when held Low. In this mode
the framer interface is bipolar (TPOS/TNEG and RPOS/RNEG), and the
B8ZS/HDB3 encoders are disabled. Enables Unipolar I/O mode when
clocked by MCLK. In this mode the framer interface is unipolar (TDATA
and RDATA), and the TNEG and RNEG pins are re-mapped. The TNEG
pins are re-mapped as Encoder Enable (ECE) to individually enable the
B8ZS/HDB3 encoder/decoder for each port. The RNEG pins are re-mapped
as Bipolar Violation (BPV) indicators to report BPVs received at the respec-
tive ports.
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TCLK0 DI Transmit Clock - Port 0. 1.544 MHz for T1, 2.048 MHz for E1. The trans-
mit data inputs are sampled on the falling edge of TCLK.
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