XRT83SL30IV View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XRT83SL30IV

SINGLE-CHANNEL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

Exar Corporation 

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REV. 1.0.1

XRT83SL30

SINGLE-CHANNEL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

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

Backplane Interface

Line Interface Card

Primary Card XRT83SL30

Tx

TxTSEL=1, Internal

0.68µF

1:2

T1/E1 Line

Backup Card

XRT83SL30

Tx

TxTSEL=1, Internal

0.68µF

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.

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