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XRT86VL38IB484 Datasheet(PDF) 11 Page - Exar Corporation

Part # XRT86VL38IB484
Description  T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT86VL38IB484 Datasheet(HTML) 11 Page - Exar Corporation

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XRT86VL3X
4
REV. 1.2.3
T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION
1.0
GENERAL DESCRIPTION AND INTERFACE
The XRT86VL3x supports multiple interfaces for various modes of operation. The purpose of this section is to
present a general overview of the common interfaces and their connection diagrams. Each mode will be
described in full detail in later sections of the datasheet.
NOTE: For a brief tutorial on Framing Formats, see Appendix A in the back of this document.
1.1
Physical Interface
The Line Interface Unit generates/receives 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
0.68
µF and a 1:2 step-up transformer. The receive path inputs only require one bypass capacitor of 0.1
µF
connected to the center tap (CT) of the transformer and a 1:1 transformer. The receive CT bypass capacitor is
required for Long Haul Applications, and recommended for Short Haul Applications. Figure 2 shows the
typical connection diagram for the LIU transmitters. Figure 3 shows a typical connection diagram for the LIU
receivers.
FIGURE 2. LIU TRANSMIT CONNECTION DIAGRAM USING INTERNAL TERMINATION
FIGURE 3. LIU RECEIVE CONNECTION DIAGRAM USING INTERNAL TERMINATION
T
TIP
T
RING
XRT86VL3x LIU
1:2
Internal Impedance
Line Interface T1/E1/J1
C=0.68uF
One Bill of Materials
Transmitter
Output
R
TIP
R
RING
XRT86VL3x LIU
1:1
Internal Impedance
Line Interface T1/E1/J1
One Bill of Materials
Receiver
Input
0.1
µF


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