XRT83SL38ES Exar, XRT83SL38ES Datasheet - Page 39

• Manufacturer Part Number: XRT83SL38ES
• Description: Peripheral Drivers & Components - PCIs 8 CHT1/E1LIUSH
• Manufacturer: Exar

Specifications of XRT83SL38ES

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

REV. 1.0.2
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
N+1 REDUNDANCY
OTE
: For simplification, the over voltage protection circuitry was omitted.
F
IGURE
F
OCTAL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
IGURE
Backplane Interface
Backplane Interface
13. S
14. S
IMPLIFIED
IMPLIFIED
TxTSEL=1, Internal
TxTSEL=1, Internal
Backup Card
Primary Card
RxT SEL=0, External
RxT SEL=1, Internal
B ackup Card
B
Primary Card
LOCK
B
LOCK
D
IAGRAM OF THE
D
IAGRAM
Tx
Tx
Rx
Rx
XRT83SL38
XRT83SL38
XRT 83SL38
XRT 83SL38
- R
37
0.68
0.68
ECEIVE
T
RANSMIT
μ
μ
F
F
S
Line Interface Card
ECTION FOR
Line Interface Card
S
1:2 or 1:2.45
ECTION FOR
1:1
1:1
AND
1:1 & 1+1 R
T1/E1 Line
T1/E1 Line
1+1 R
EDUNDANCY
XRT83SL38
EDUNDANCY
Figure 14
for a