XRT83SH38ES View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XRT83SH38ES

14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

Exar Corporation 

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XRT83SH38

8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

REV. 1.0.7

5.1.3 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 digital loopback mode includes the Transmit JA (if enabled). 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 25.

FIGURE 25. SIMPLIFIED BLOCK DIAGRAM OF DIGITAL LOOPBACK

TCLK

TPOS

TNEG

RCLK

RPOS

RNEG

QRSS

Encoder

JA

TAOS

Timing

Control

Tx

Data and

Decoder

JA

Clock

Rx

Recovery

TTIP

TRING

RTIP

RRING

5.1.4 Dual Loopback

With dual loopback activated, the remote loopback is combined with the digital loopback. A simplified block

diagram of dual loopback is shown in Figure 26.

FIGURE 26. SIMPLIFIED BLOCK DIAGRAM OF DUAL LOOPBACK

TCLK

TPOS

TNEG

RCLK

RPOS

RNEG

QRSS

Encoder

JA

Decoder

JA

TAOS

Timing

Control

Tx

Data and

Clock

Rx

Recovery

TTIP

TRING

RTIP

RRING

35

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