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PM7347 Folha de dados(PDF) 299 Page - PMC-Sierra, Inc

Nome de Peças PM7347
Descrição Electrónicos  SATURN USER NETWORK INTERFACE for J2/E3/T3
PDF  341 Pages
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Fabricante Electrônico  PMC [PMC-Sierra, Inc]
Página de início  http://www.pmc-sierra.com
Logo PMC - PMC-Sierra, Inc

PM7347 Folha de dados(HTML) 299 Page - PMC-Sierra, Inc

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S/UNI®-JET Data Sheet
Released
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
299
Document ID: PMC-1990267, Issue 3
Figure 38 Receive DS3 Overhead
ROHFP
ROHCLK
ROHCLK
ROH
ROHFP
X1
Unused
C1
Unused
C2
Unused
C3
DS3 M-frame Period
The Receive DS3 Overhead diagram (Figure 38) shows the extraction of the DS3 overhead bits
on the ROH output, along with overhead clock (ROHCLK), and
M-frame position indicator (ROHFP). The DS3 M-frame can be divided into seven M-subframes,
with each subframe containing eight overhead bits. The table below illustrates the overhead bit
order on ROH:
Table 44 DS3 Receive Overhead Bits
DS3 Overhead Bits
M-subframe
123
45
67
8
1
X1
N/U
C1
N/U
C2
N/U
C3
N/U
2
X2
N/U
C1
N/U
C2
N/U
C3
N/U
3P1
N/U
C1
N/U
C2
N/U
C3
N/U
4P2
N/U
C1
N/U
C2
N/U
C3
N/U
5
M1
N/U
C1
N/U
C2
N/U
C3
N/U
6
M2
N/U
C1
N/U
C2
N/U
C3
N/U
7
M3
N/U
C1
N/U
C2
N/U
C3
N/U
The DS3 framing bits (F-bits) are not extracted on the overhead port. The bit positions
corresponding to the F-bits in the extracted stream are marked N/U in the above table. The ROH
stream is invalid when the DS3 frame alignment is lost.



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