XRT86VL3X datasheet(13/154 Pages) EXAR

Part #	XRT86VL3X

Description	T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION

PDF	154 Pages

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Manufacturer	EXAR [Exar Corporation]

Direct Link	http://www.exar.com

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XRT86VL3X

REV. 1.2.3

T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION

1.2.5

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 5. for a simplified block

diagram of the receive section for a 1:1 redundancy scheme.

FIGURE 5. SIMPLIFIED BLOCK DIAGRAM OF THE RECEIVE INTERFACE FOR 1:1 AND 1+1 REDUNDANCY

"High" Impedence

Internal Impedence

Backplane Interface

Primary Card

Backup Card

XRT86VL3x

T1/E1 Line

1:1

XRT86VL3x

XRT86VL3X Datasheet(PDF) 13 Page - Exar Corporation