CHAPTER 3 FUNCTIONAL OUTLINE
PRELIMINARY
NEC confidential and Proprietary
43
Figure 3-8. Offset Value of Pointer
1
2
3
4
5
6
7
8
9
1
37
1080
Address
STS-12c SPE
36
A1…....A1
A2…....A2
J0.…...Z0
H1.…...H1 H2…....H2 H3…....H3
522…..522 523…..523
782…..782
0….. 0 1….. 1
781…..781
87…..87
521…..521
86…..86
435…..435
12
608…..608
(e) BIP generation
The B1, B2, and B3 bytes of the overhead are used to monitor an error of a frame. The
µ
PD98413 performs
a BIP (Bit Interleaved Parity) operation on the transmit frame data and inserts the result of the operation into
the positions equivalent to the B1, B2, and B3 bytes of the next overhead.
(f) REI
transmission
Whether a BIP error has occurred at the reception side is reported to the transmission destination device. If
a B2 error is detected in a receive frame, the number of errors is stored into M1 byte of line overhead as Line
REI (Remote Error Indication) for transmission. If a B3 error is detected, the number of errors is stored into
G1 (bits 1 to 4) as Path REI for transmission.
(2) Insert function of transmit OH byte
The
µ
PD98413 supplies the following four types of means to set the contents of the OH byte of a transmit frame.
•
OH insert register
•
OH insert interface
•
Section and Line DCC insert interface
•
Setting of J0/J1 byte trace message
If the same OH byte is set by two or more means, the priority is as follows:
OH insert interface
Internal processing of
µ
PD98413
•
BIP, REI processing
•
Pointer processing
•
Transmission of alarm
High
Low
Priority
Section and Line DCC
insert interface
J0, J1 byte
trace message
transmission command
OH insert register
Содержание UPD98413
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