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1
A1 ....... A1 A2 ....... A2 J0 ....... Z0
1
2
3
4
H1 ....... H1 H2 ....... H2 H3 ....... H3
5
6
7
8
9
(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:
Low
OH insert register
transmission command
CHAPTER 3 FUNCTIONAL OUTLINE
Figure 3-8. Offset Value of Pointer
12
37
36
522 ..... 522 523 ..... 523
0 .....
0 1 .....
87 ..... 87
435 ..... 435
Priority
J0, J1 byte
trace message
Section and Line DCC
PRELIMINARY
1
STS-12c SPE
Address
OH insert interface
insert interface
1080
608 ..... 608
782 ..... 782
781 ..... 781
86 ..... 86
521 ..... 521
High
Internal processing of µPD98413
• BIP, REI processing
• Pointer processing
• Transmission of alarm
NEC confidential and Proprietary
43
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