XRT81L27 Datasheet, PDF (26/30 Pages) Exar Corporation – SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY

XRT81L27
SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY
REV. 1.1.0
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FIGURE 13. SCHEMATIC FOR INTERFACING THE RECEIVE SECTIONS OF THE XRT81L27 TO THE LINE FOR 75Ω
(TRANSFORMER-COUPLED) APPLICATIONS
RPOS_n
RTIP_n
RNEG_n
RClk_n
LOS_n
XRT81L27
RRING_n
Line
1: 2
Input
FIGURE 14. SCHEMATIC FOR INTERFACING THE RECEIVE SECTIONS OF THE XRT81L27 TO THE LINE FOR 120Ω
(TRANSFORMER-COUPLED) APPLICATIONS
RPOS_n
RNEG_n
RTIP_n
RClk_n
LOS_n
RRing_n
XRT81L27
1:2
Line
Input
The Transformer used should be 1:2 step up for
Transmit direction and 2:1 step down for the Receive
direction. The following transformers are recommend-
ed: Pulse PE-65681, Pulse T1090, and HALO TG08-
1505N1.
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