XRT83SL314 datasheet(35/83 Pages) EXAR

Part #	XRT83SL314

Description	14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

PDF	83 Pages

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Manufacturer	EXAR [Exar Corporation]

Direct Link	http://www.exar.com

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35 / 83 page

XRT83SL314

14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

REV. 1.0.1

3.3.5

Transmit Interface with N+1 Redundancy

For N+1 redundancy, the transmitters on all cards should be programmed for internal impedance.

The

transmitters on the backup card do not have to be tri-stated. To swap the primary card, close the desired

relays, and tri-state the transmitters on the failed primary card. A 0.68uF capacitor is used in series with TTIP

for blocking DC bias.

See Figure 26 for a simplified block diagram of the transmit section for an N+1

redundancy scheme.

FIGURE 26. SIMPLIFIED BLOCK DIAGRAM OF THE TRANSMIT INTERFACE FOR N+1 REDUNDANCY

Backplane Interface

Primary Card

XRT83SL314

Line Interface Card

0.68uF

T1/E1 Line

0.68uF

Primary Card

0.68uF

Primary Card

0.68uF

Backup Card

T1/E1 Line

Internal

Impedence

1:2

XRT83SL314

Internal

Impedence

Internal

Impedence

Internal

Impedence

XRT83SL314 Datasheet(PDF) 35 Page - Exar Corporation