XRT72L13 datasheet(70/370 Pages) EXAR

70 / 370 page

XRT72L13

MULTIPLEXER/FRAMER IC

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PRELIMINARY

REV. 1.0.6

As Figure 28 indicates, a given DS2 or ITU-T G.747

line can be commanded into the "DS2/ITU-T G.747

Tributary Loop-Back" Mode. When this happens,

then a selected DS2 or ITU-T G.747 data stream (in

the Receive Path) is looped back into the Transmit

Path. It is important to note that the corresponding

DS2 or ITU-T G.747 clock signal is also looped back

into the Transmit Path.

1.2

XRT72L13 OPERATION WHILE IN THE

"CLEAR CHANNEL DS3 FRAMER MODE"

Figure 29 presents a functional block diagram of the

XRT72L13 when it has been configured to operate in

the "Clear Channel DS3 Framer Mode".

FIGURE 28. ILLUSTRATION OF THE XRT72L13 OPERATING IN THE "DS2/ITU-T G.747 TRIBUTARY LOOP-BACK

MODE

Clear Channel

DS3 Framer

Clear Channel

DS3 Framer

Microprocessor

Interface

Microprocessor

Interface

M12

MUX

M12

DEMUX

M23

MUX

M23

DEMUX

TxDS1[0: 27]

TxClk[0:27]

RxDS1[0: 27]

RxClk[0:27]

RxPOS

RxNEG

TxPOS

TxNEG

RxLineClk

TxLineClk

32/64 Bit

De-Jitter

FIFO

DS2/G.747 Loop-Back Path

(Data and Clock are both Looped

Back)

XRT72L13 Datasheet(PDF) 70 Page - Exar Corporation

XRT72L13 Datasheet(HTML) 70 Page - Exar Corporation

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