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DS3142 Datasheet(PDF) 21 Page - Dallas Semiconductor

Part # DS3142
Description  Single/Dual/Triple/Quad DS3/E3 Framers
PDF  88 Pages
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS3142 Datasheet(HTML) 21 Page - Dallas Semiconductor

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DS3141/DS3142/DS3143/DS3144 Single/Dual/Triple/Quad DS3/E3 Framers
21 of 88
Table 7-B. BERT/Loopback Interaction—Overhead Bits
CONFIGURATION BITS
BITS AT OVERHEAD BIT POSITIONS
DLB
LLB
PLB
BM [1:0]
From RPOS/RNEG To:
From TDAT To:
From Formatter To:
From BERT To:
0
0
0
00
Framer and RDAT
Not used (Note 1)
TPOS/TNEG
Not generated
0
0
0
01
Framer, RDAT and
BERT
Not used
Not used
TPOS, TNEG
0
0
0
10
Framer and RDAT
Not used (Note 1)
TPOS/TNEG
Not generated
0
0
0
11
Framer
BERT (Note 2)
TPOS/TNEG
RDAT
1
0
0
00
Not used
Not used (Note 1)
TPOS/TNEG,
Framer, and RDAT
Not generated
1
0
0
01
Not used
Not used
Not used
TPOS/TNEG,
Framer, BERT,
and RDAT
1
0
0
10
Not used
Not used (Note 1)
TPOS/TNEG,
Framer, and RDAT
Not generated
1
0
0
11
Not used
BERT (Note 2)
TPOS/TNEG and
Framer
RDAT
0
1
0
00
TPOS/TNEG, Framer,
and RDAT
Not used
Not used
Not generated
0
1
0
01
TPOS/TNEG, Framer,
RDAT, and BERT
Not used
Not used
Not used
0
1
0
10
TPOS/TNEG, Framer,
and RDAT
Not used
Not used
Not generated
0
1
0
11
TPOS/TNEG and
Framer
BERT (Note 2)
Not used
RDAT
0
0
1
00
Framer and RDAT
Not used (Note 1)
TPOS/TNEG
Not generated
0
0
1
01
Framer, RDAT, and
BERT
Not used
Not used
TPOS/TNEG
0
0
1
10
Framer and RDAT
Not used (Note 1)
TPOS/TNEG
Not generated
0
0
1
11
Framer
BERT (Note 2)
TPOS/TNEG
RDAT
Note 1: In M23 mode or E3 mode, the transmit formatter sources the C bits from the appropriate bit positions of the TDAT data stream.
Note 2: When BM[1:0] = 11, the BERT expects a full-bandwidth (payload plus overhead) pattern to come in on the TDAT pin. In M23 mode or
E3 mode with BM[1:0] = 11, the transmit formatter sources the C bits from the appropriate bit positions of the TDAT data stream, even
though those bit positions are actually part of the full-bandwidth BERT pattern.



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