ort8850 Lattice Semiconductor Corp., ort8850 Datasheet - Page 26

• Manufacturer Part Number: ort8850
• Description: Field-programmable System Chip Fpsc Eight-channel X 850 Mbits/s Backplane Transceiver
• Manufacturer: Lattice Semiconductor Corp.

Lattice Semiconductor
Byte Ordering in SONET Frames
The ORT8850 expects byte ordering in the SONET frames to be in the standard byte interleaved format per the
GR-253 SONET standard. Byte ordering is the same in both the transmit and receive direction and treats the data
as multiple STS-1 frames. When using the ORT8850 in STS-3 format both the transmitter and receiver device must
be framed, based on STS-3 format. Likewise for the STS-12 format, both must operate in STS-12 format.
Table 6. Byte Ordering, STS-3 Format
Table 7. Byte Ordering, STS-12 Format
STS-12 A -->
STS-12 B -->
STS-12 C -->
STS-12 D -->
STS-3 A -->
STS-3 B -->
STS-3 C -->
STS-3 D -->
12
12
12
12
3
3
3
3
3
3
3
3
9
9
9
9
3
3
3
3
6
6
6
6
3
3
3
3
3
3
3
3
11
11
11
11
2
2
2
2
26
2
2
2
2
8
8
8
8
2
2
2
2
5
5
5
5
2
2
2
2
2
2
2
2
ORCA ORT8850 Data Sheet
10
10
10
10
1
1
1
1
1
1
1
1
7
7
7
7
1
1
1
1
4
4
4
4
1
1
1
1
1
1
1
1