XRT83SL28 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT83SL28' PDF : 47 Pages View PDF
xr
REV. 1.0.0
XRT83SL28
8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
3.1.3 Digital Loopback
With digital loopback activated, the transmit input data at TCLK/TPOS/TNEG is looped back to the receive
output data at RCLK/RPOS/RNEG. The receive input data at RTIP/RRING is ignored while valid transmit
output data continues to be sent to the line. A simplified block diagram of digital loopback is shown in
Figure 20.
FIGURE 20. SIMPLIFIED BLOCK DIAGRAM OF DIGITAL LOOPBACK
TCLK
TPOS
TNEG
RCLK
RPOS
RNEG
Encoder
JA
TAOS
Timing
Control
Tx
Data and
Decoder
JA
Clock
Rx
Recovery
TTIP
TRING
RTIP
RRING
25
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