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| 型號(hào)： | M-ORSO82G52BM680-DB |
| 廠商： | LATTICE SEMICONDUCTOR CORP |
| 元件分類(lèi)： | FPGA |
| 英文描述： | FPGA, 1296 CLBS, 333000 GATES, PBGA680 |
| 封裝： | PLASTIC, FBGA-680 |
| 文件頁(yè)數(shù)： | 48/123頁(yè) |
| 文件大?。?/td> | 2207K |
| 代理商： | M-ORSO82G52BM680-DB |
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Lattice Semiconductor
ORCA ORSO82G5 Data Sheet
30
SONET TOH Byte Denitions
The Transport OverHead bytes of the SONET frame can be used for in-band conguration, service, and manage-
ment since it is carried along the same channel as data. In the ORSO8850 in-band signaling can be efciently uti-
lized, since the total cost of overhead is only 3.3%. The overhead bytes in an STS-1 header are shown in Table 17
(The path overhead bytes are in the SPE.)
Figure 17. SONET Overhead Bytes
When used in true SONET applications, most TOH bytes will be generated in the FPGA logic or by an external
device. When used to transfer non-SONET data, all of the overhead bytes except those set by the embedded core
can be ignored using AUTO_TOH mode. The TOH bytes have the following functions in true SONET applications.
Section Overhead Bytes:
– A1, A2 - These bytes are used for framing and to mark the beginning of a SONET frame. A1 has the value 0x
F6 and A2 has the value 0x28.
– J0 - Section Trace Message - This byte carries the section trace message. The message is interpreted to
verify connectivity to a particular node in the network.
– B1 - Section Bit Interleaved Parity (BIP-8) byte - This byte carries the parity information which is used to
check for transmission errors in a section. The computed parity value is transmitted in the next frame in the
B1 position. It is dened only for the rst STS-1 of a STS-N signal. The other bytes have a default value of
0x00.
– E1 - Section orderwire byte - This byte carries local orderwire information, which provides for a 64 Kbps
voice channel between two Section Termination Equipment (STE) devices.
– F1 - Section user channel byte - This byte provides a 64 Kbits/s user channel which can be used in a propri-
etary fashion.
– D1, D2, D3 - Section Data Communications Channel (SDCC) bytes - These bytes provide a 192 Kbits/s
channel for transmission of information across STEs. This information could be for control and conguration,
status monitoring, alarms, network administration data etc.
J1
B3
C2
H4
G1
F2
Z4
Z5
Z6
A1
A2
J0
B1
E1
F1
D1
D2
D3
H1
H2
H3
B2
K1
K2
D4
D5
D6
D7
D8
D9
D10
D11
D12
S1/Z1
Z3
E2
J1
B3
C2
H4
G1
F2
Z4
Z5
Z6
0
1
4
3
2
5
6
7
8
Transport
Overhead
Path
Overhead
012
Line
Overhead
Section
Overhead
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