XRT59L921 Datasheet, PDF (24/32 Pages) Exar Corporation – TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT

XRT59L921
TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
REV. 1.2.1
FIGURE 10. RECOMMENDED SCHEMATIC FOR INTERFACING THE RECEIVE SECTIONS OF THE XRT59L921 TO THE
LINE FOR 120Ω APPLICATIONS (TRANSFORMER-COUPLING)
RxPOS_n
RxNEG_n
LOS_n
XRT59L921
RTIP_n
RxPOS_n
RxNEG_n
LOS_n
RRING_n
1:1
120 Ω
RTIP_n
RRing_n
NOTE: Figure 9 and Figure 10 indicate that the user should use a 1:1 transformer, when interfacing the receiver to the
line.
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