XRT82L24A Datasheet, PDF(14/39 Page) Exar Corporation – QUAD E1 LINE TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

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XRT82L24A Datasheet, PDF (14/39 Pages) Exar Corporation – QUAD E1 LINE TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

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XRT82L24A

QUAD E1 LINE TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR

REV. 1.1.2

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be sent to the line uninterrupted. This loop back fea-

ture allows users to configure the line interface as a

pure jitter attenuator. (see Loop-Back Mode in

Figure 6 & Figure 7).

NOTE: Digital Local Loop-Back is not supported in Hard-

ware Mode.

ANALOG LOCAL LOOP-BACK (ALOOP) MODE

With Analog Local Loop-Back activated, the transmit

data at TTIP and TRING are looped-back to the ana-

log input of the receiver. External inputs at RTIP/

RRING in this mode are ignored while valid transmit

data continues to be sent to the line. Analog Loop-

Back exercises most of the functional blocks of the

line interface (see Loop-Back Mode in Figure 8 &

Figure 9).

FIGURE 4. REMOTE LOOP-BACK WITH JITTER ATTENUATOR SELECTED IN RECEIVE PATH

TxPOS

TxNEG

TxClk

Encoder

RxClk

RxPOS

Decoder

RxNEG

Timing

Control

TTIP

TRing

Clock &

Data

Recovery

RTIP

RRing

FIGURE 5. REMOTE LOOP-BACK WITH JITTER ATTENUATOR SELECTED IN TRANSMIT PATH