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SA9101 датащи(PDF) 16 Page - Sames

номер детали SA9101
подробное описание детали  PCM FRAME ALIGNER
PDF  40 Pages
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производитель  SAMES [Sames]
домашняя страница  http://www.sames.co.za
Logo SAMES - Sames

SA9101 датащи(HTML) 16 Page - Sames

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Synchronization procedure
Multiframe alignment is assumed to have been lost if double-frame alignment has been
lost or 2 consecutive multiframe patterns are received with an error.
The multiframe re-synchronization procedure starts when doubleframe alignment has
been regained. It may also be invoked by the user through the µP-interface. The CRC
checking mechanism will be enabled after the second correct multiframe pattern has
been found. However, CRC errors will not be counted in unsynchronized state.
The (multiframe) synchronized state is reached after detecting two correct multiframe
alignment patterns in multiframe n and multiframe n+1. The CRC4 flag SR0B1 will be
reset. Resynchronization starts whenever two consecutive multiframes are received
with incorrect multiframe alignment pattern.
Sub-
Frame
Bits 1 to 8 of the frame
Multiframe
No.
1
2
3
4
5
6
7
8
0C
1
00
11
0
1
1
10
1
A
S
n0
S
n1
S
n2
S
n3
S
n4
2C
2
00
11
0
1
1
I3
0
1
A
S
n0
S
n1
S
n2
S
n3
S
n4
4C
3
00
11
0
1
1
51
1
A
S
n0
S
n1
S
n2
S
n3
S
n4
6C
4
00
11
0
1
1
70
1
A
S
n0
S
n1
S
n2
S
n3
S
n4
Multiframe
8
C
1
00
11
0
1
1
91
1
A
S
n0
S
n1
S
n2
S
n3
S
n4
10
C
2
00
11
0
1
1
II
11
1
1
A
S
n0
S
n1
S
n2
S
n3
S
n4
12
C
3
00
11
0
1
1
13
S
i*1
A
S
n0
S
n1
S
n2
S
n3
S
n4
14
C
4
00
11
0
1
1
15
S
i*1
A
S
n0
S
n1
S
n2
S
n3
S
n4
S
i*:
Spare bits for international use.
Access to received information via µP-
interface. (For transmission, automatic transmission of sub-multiframe error
or insertion through µP-interface is selectable).
S
n :
Spare bits for national use. Additionally, the 5-byte stacks for receive and
transmit are provided.
C1..C4: Cyclic Redundancy Check bits.
A :
Remote Alarm Indication.
Table 2: CRC-Multiframe Structure



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