XRT83VSH28IB-F View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT83VSH28IB-F' PDF : 74 Pages View PDF
XRT83VSH28
PRELIMINARY
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
REV. P1.0.0
4.2.3 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. To swap the primary card, set the backup card to
internal impedance, then the primary card to "High" impedance. See Figure 25. for a simplified block diagram
of the receive section for a 1:1 redundancy scheme.
FIGURE 25. 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
XRT83VSH28
1:1
XRT83VSH28
1:1
E1 Line
35
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