XRT83SL34 datasheet(37/80 Pages) EXAR

Il numero della parte	XRT83SL34

Spiegazioni elettronici	QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

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XRT83SL34

QUAD T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

PRELIMINARY

REV. P1.0.8

RECEIVE

For N+1 redundancy, the receivers on the primary cards should be programmed for internal impedance mode.

The receivers on the backup card should be programmed for external impedance mode. Since there is no

external resistor in the circuit, the receivers on the backup card will be high impedance. Select the impedance

for the desired mode of operation, T1/E1/J1. To swap the primary card, set the backup card to internal

impedance mode, then the primary card to external impedance mode. See Figure 17. for a simplified block

diagram of the receive section for a N+1 redundancy scheme.

NOTE: For simplification, the over voltage protection circuitry was omitted.

FIGURE 17. SIMPLIFIED BLOCK DIAGRAM - RECEIVE SECTION FOR N+1 REDUNDANCY

B a ckp lane In te rface

P rim ary C a rd

X R T 83S L3 4

Line In te rface C a rd

P rim ary C a rd

X R T 83S L3 4

P rim ary C a rd

X R T 83S L3 4

B a ckup C a rd

X R T 83S L3 4

R xT S E L =1 , In te rn a l

R xT SEL=1 , Exte rnal

T 1 /E 1 Line

1:1

XRT83SL34 Scheda tecnica(PDF) 37 Page - Exar Corporation