XRT83L314 Datasheet, PDF (37/84 Pages) Exar Corporation – 14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT

XRT83L314
14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
the interrupt pin to go "Low". Once the status register is read, the interrupt pin will return "High" and the status
register will be reset (RUR).
3.8 Line Termination (TTIP/TRING)
The output stage of the transmit path generates standard return-to-zero (RZ) signals to the line interface for
T1/E1/J1 twisted pair or E1 coaxial cable. The physical interface is optimized by placing the terminating
impedance inside the LIU. This allows one bill of materials for all modes of operation reducing the number of
external components necessary in system design. The transmitter outputs only require one DC blocking
capacitor of 0.68µF. For redundancy applications (or simply to tri-state the transmitters), set TxTSEL to a "1" in
the appropriate channel register. A typical transmit interface is shown in Figure 30.
FIGURE 30. TYPICAL CONNECTION DIAGRAM USING INTERNAL TERMINATION
XRT83L314 LIU
T_TIP
Transmitter
Output
T_RING
Internal Impedance
1:2
C=0.68uF
Line Interface T1/E1/J1
One Bill of Materials
33