XRT72L13 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT72L13' PDF : 370 Pages View PDF
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PRELIMINARY
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC XRT72L13
REV. 1.0.6
FIGURE 27. ILLUSTRATION OF THE XRT72L13 OPERATING IN THE "DS1/E1 TRIBUTARY LOOP-BACK MODE
TxPOS
TxNEG
TxLineClk
RxPOS
RxNEG
RxLineClk
CCleleaarrCChhaannnneel l
DDSS33FFrraammeerr
32/64 Bit
De-Jitter
FIFO
M23
MUX
M12
MUX
DS2 or G.747
Data Streams
M23
DEMUX
M12
DEMUX
MMicicrroopprroocceessssoorr
IInnteterrfafaccee
TxDS1[1: 27]
RxDS1_0
TxClk[1:27]
RxDS1[1: 27]
RxClk[1:27]
RxClk_0
As Figure 27 indicates, a given DS1 line can be com-
manded into the "DS1/E1 Tributary Loop-Back"
Mode. When this happens, then a selected DS1 or
E1 line, in the Receive Path, is looped back into the
Transmit Path. It is important to note that the corre-
sponding DS1 or E1 clock signal is also looped back.
1.1.3.2 DS2/ITU-T G.747 Tributary Loop-Back
Mode
Figure 28 presents an illustration of the XRT72L13
operating in the "DS2/ITU-T G.747 Tributary Loop-
Back" Mode.
57
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