XRT83SH314ES Exar, XRT83SH314ES Datasheet - Page 40

• Manufacturer Part Number: XRT83SH314ES
• Description: Peripheral Drivers & Components - PCIs 14 CHT1/E1LIU SH
• Manufacturer: Exar

Specifications of XRT83SH314ES

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

XRT83SH314
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
The receivers on the backup card should be programmed for "High" impedance. Since there is no external
resistor in the circuit, the receivers on the backup card will not load down the line interface. 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, then the primary card to "High" impedance. See
diagram of the receive section for a 1:1 redundancy scheme.
F
N+1 redundancy has one backup card for N primary cards.
contention, external relays are necessary when using this redundancy scheme. The relays create complete
isolation between the primary cards and the backup card. This allows all transmitters and receivers on the
primary cards to be configured in internal impedance, providing one bill of materials for all interface modes of
operation. The transmit and receive sections of the LIU device are described separately.
4.3.3
4.3.4
IGURE
28. S
Receive Interface with 1:1 and 1+1 Redundancy
N+1 Redundancy Using External Relays
IMPLIFIED
Backplane Interface
B
LOCK
Backup Card
Primary Card
Internal Impedence
D
"High" Impedence
IAGRAM OF THE
Rx
Rx
R
ECEIVE
36
I
NTERFACE FOR
XRT83SH314
XRT83SH314
1:1
1:1
Due to impedance mismatch and signal
1:1
AND
Figure
1+1 R
T1/E1 Line
28. for a simplified block
EDUNDANCY
REV. 1.0.4