xrt83l30 Exar Corporation, xrt83l30 Datasheet - Page 37

• Manufacturer Part Number: xrt83l30
• Description: Xrt83l30 -single-channel T1/e1/j1 Long-haul, Short-haul Line Interface Unit
• Manufacturer: Exar Corporation

REV. 1.0.1
RECEIVE
For N+1 redundancy, the receivers on the primary cards 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. 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
diagram of the receive section for a N+1 redundancy scheme.
N
F
OTE
IGURE
Backplane Interface
: For simplification, the over voltage protection circuitry was omitted.
19. S
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
IMPLIFIED
RxTSEL=1, Internal
RxTSEL=1, Internal
RxTSEL=1, Internal
RxTSEL=1, External
Primary Card
Primary Card
Backup Card
Primary Card
B
LOCK
D
IAGRAM
XRT83L30
XRT83L30
XRT83L30
XRT83L30
Rx
Rx
Rx
Rx
- R
ECEIVE
S
ECTION FOR
34
Line Interface Card
N+1 R
EDUNDANCY
Figure
1:1
1:1
1:1
19. for a simplified block
XRT83L30
T1/E1 Line
T1/E1 Line
T1/E1 Line