XRT83SH38 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT83SH38' PDF : 78 Pages View PDF
XRT83SH38
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.7
5.2.3 Receive Interface with 1:1 and 1+1 Redundancy
The receivers on the backup card should be programmed for "High" impedance. Since there is no external
resistor in the circuit, the receivers on the backup card will not load down the line interface. This key design
feature eliminates the need for relays and provides one bill of materials for all interface modes of operation.
Select the impedance for the desired mode of operation, T1/E1/J1. To swap the primary card, set the backup
card to internal impedance, then the primary card to "High" impedance. See Figure 28. for a simplified block
diagram of the receive section for a 1:1 redundancy scheme.
FIGURE 28. SIMPLIFIED BLOCK DIAGRAM OF THE RECEIVE INTERFACE FOR 1:1 AND 1+1 REDUNDANCY
Backplane Interface
Primary Card
Rx
Internal Impedence
Backup Card
Rx
"High" Impedence
XRT83SH38
1:1
XRT83SH38
1:1
T1/E1 Line
37
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