XRT83SL30ES Exar, XRT83SL30ES Datasheet - Page 33

• Manufacturer Part Number: XRT83SL30ES
• Description: Peripheral Drivers & Components - PCIs 1 CHT1/E1 LIUSH
• Manufacturer: Exar

Specifications of XRT83SL30ES

• Product Category: Peripheral Drivers & Components - PCIs
• Rohs: yes

REV. 1.0.1
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
simplified block diagram of the receive section for a 1:1 and 1+1 redundancy scheme.
N
OTE
: For simplification, the over voltage protection circuitry was omitted.
F
IGURE
SINGLE-CHANNEL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
Backplane Interface
14. S
IMPLIFIED
TxTSEL=1, Internal
TxTSEL=1, Internal
Backup Card
Primary Card
B
LOCK
D
IAGRAM OF THE
Tx
Tx
XRT83SL30
XRT83SL30
30
0.68µF
0.68µF
T
RANSMIT
Line Interface Card
S
ECTION FOR
1:2
1:1 & 1+1 R
T1/E1 Line
XRT83SL30
EDUNDANCY
Figure 15
for a