XRT83L314IB View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT83L314IB' PDF : 84 Pages View PDF
XRT83L314
14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
card to internal impedance, then the primary card to "High" impedance. See Figure 37. for a simplified block
diagram of the receive section for a 1:1 redundancy scheme.
FIGURE 37. SIMPLIFIED BLOCK DIAGRAM OF THE RECEIVE INTERFACE FOR 1:1 AND 1+1 REDUNDANCY
Backplane Interface
Primary Card
Rx
Internal Impedence
Backup Card
Rx
"High" Impedence
XRT83L314
1:1
XRT83L314
1:1
T1/E1 Line
4.3.4 N+1 Redundancy Using External Relays
N+1 redundancy has one backup card for N primary cards. Due to impedance mismatch and signal
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.
38
Share Link: 
