XRT83SL34 datasheet(35/80 Pages) EXAR

35 / 80 page

XRT83SL34

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

PRELIMINARY

REV. P1.0.8

RECEIVE 1:1 & 1+1 REDUNDANCY

For 1:1 and 1+1 redundancy, the receivers on the primary card 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. 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 mode, then the primary card to External Impedance mode. See Figure 15 for a

simplified block diagram of the receive section for a 1:1 and 1+1 redundancy scheme.

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

FIGURE 14. SIMPLIFIED BLOCK DIAGRAM OF THE TRANSMIT SECTION FOR 1:1 & 1+1 REDUNDANCY

FIGURE 15. SIMPLIFIED BLOCK DIAGRAM - RECEIVE SECTION FOR 1:1 AND 1+1 REDUNDANCY

T 1 /E 1 Line

B a ckp la n e In te rfa ce

Prim a ry C a rd

B a ckup C a rd

X R T 83S L34

Line In te rface C a rd

0.68

µF

0.68

µF

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

1:2 or 1:2.45

R xT SEL =0 , Exte rn a l

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

B a ckp la n e In te rfa ce

Prim a ry C a rd

B a ckup C a rd

X R T 83S L34

Line In te rface C a rd

T 1 /E 1 Line

1:1

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