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XRT83SL314IB Datasheet(PDF) 44 Page - Exar Corporation |
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XRT83SL314IB Datasheet(HTML) 44 Page - Exar Corporation |
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44 / 85 page  XRT83SL314 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT REV. P1.0.5 PRELIMINARY 39 4.3.6 Receive Interface with N+1 Redundancy For N+1 redundancy, the receivers on the primary cards should be programmed for internal impedance. The receivers on the backup card should be programmed for "High" impedance mode. To swap the primary card, set the backup card to internal impedance, then the primary card to "High" impedance. See Figure 36 for a simplified block diagram of the receive section for a N+1 redundancy scheme. FIGURE 36. SIMPLIFIED BLOCK DIAGRAM OF THE RECEIVE INTERFACE FOR N+1 REDUNDANCY Backplane Interface Primary Card XRT83SL314 Rx Line Interface Card Primary Card Rx Primary Card Rx Backup Card Rx Internal Impedence T1/E1 Line T1/E1 Line T1/E1 Line 1:1 1:1 1:1 XRT83SL314 XRT83SL314 XRT83SL314 Internal Impedence Internal Impedence "High" Impedence |
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