CHAPTER 3 FUNCTIONAL OUTLINE
PRELIMINARY
NEC confidential and Proprietary
40
3.1 SONET Overhead Processing
3.1.1 Transmission
Function
(1) Generation of SONET frame
The cell/packet stream is mapped onto the payload area of STS-12c SPE of SONET, and the
µ
PD98413 creates
a SONET STS-12c frame by adding the path overhead (POH) and transport overhead (TOH) information. For
details of the format of the frame to be created, see
Figure 3-4
.
Figure 3-4. STS-12c SPE
1
2
3
4
5
6
7
8
9
ST
S PO
H
(
9
b
y
te
s
)
1,044 bytes
F
ix
e
d
s
tu
ff
by
te
s
(
2
7
b
y
te
s
)
1
STS TOH (324
bytes)
36 bytes
STS-12c Payload
(9,360 bytes)
STS-12c SPE (Synchronous Payload Envelope)
3
The overhead generated by the
µ
PD98413 and the selection of a mode is described below.
(a) Selecting contents of unused OH byte
All 00H is inserted into the following areas of TOH (hatched area in Figure 3-5). The inserted value can be
changed to FFH by using the UUBM bit of the MDSOHT and MDLOHT registers.
<1>
Unused byte area (area marked in Figure 3-5)
<2>
H3 byte (Negative Stuff byte)
<3>
Z1 and Z2 bytes (except the 1st Z2 byte)
Содержание UPD98413
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