XRT83SL38IB View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT83SL38IB' PDF : 88 Pages View PDF
XRT83SL38
OCTAL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. P1.1.0
PRELIMINARY
In the Remote Loop-Back mode if the jitter attenuator is selected in the transmit path, the receive data from the
Clock and Data Recovery block is looped back to the transmit path and is applied to the jitter attenuator using
RCLK as transmit timing. In this mode the transmit clock and data are also ignored, while RCLK and received
data will continue to be available at their respective output pins. Remote Loop-Back with the jitter attenuator
selected in the transmit path is shown in Figure 20.
FIGURE 20. REMOTE LOOP-BACK MODE WITH JITTER ATTENUATOR SELECTED IN TRANSMIT PATH
TPOS
TNEG
Encoder
JA
TCLK
RCLK
RPOS
RNEG
Decoder
Timing
Control
Tx
TTIP
TRING
Clock &
RTIP
Data
Rx
Recovery
RRING
DIGITAL LOOP-BACK (DLOOP)
Digital Loop-Back or Local Loop-Back allows the transmit clock and data to be looped back to the
corresponding receiver output pins through the encoder/decoder and jitter attenuator. In this mode, receive
data and clock are ignored, but the transmit data will be sent to the line uninterrupted. This loop back feature
allows users to configure the line interface as a pure jitter attenuator. The Digital Loop-Back signal flow is
shown in Figure 21.
FIGURE 21. DIGITAL LOOP-BACK MODE WITH JITTER ATTENUATOR SELECTED IN TRANSMIT PATH
TPOS
TNEG
Encoder
JA
Timing
Control
Tx
TCLK
TTIP
TRING
RCLK
RPOS
RNEG
Decoder
Data &
Clock
Recovery
RTIP
Rx
RRING
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