CHAPTER 3 FUNCTIONAL OUTLINE
PRELIMINARY
NEC confidential and Proprietary
91
3.4.6 Monitoring Line Quality (Performance Monitoring)
(1) Transmission performance monitoring-related functions
To monitor a sign error to maintain the line quality at the transmission side, a Bit Interleaved Parity (BIP)
operation is performed on a specific area and the result is inserted as an OH byte. In addition, the number of
Interleaved Bit Blocks in which an error has been detected at the reception side is inserted in the OH byte at the
transmission side and transmitted to the upstream side.
(a) Bit Interleaved Parity (BIP)
(i)
B1 byte (Section BIP-8)
BIP-8 operation is performed on all the bits in frames after frame descramble, and the result of this
operation is inserted in the B1 byte before frame scramble of the next frame, then transmitted.
AU pointer
AU pointer
B1
After scramble
Before scramble
1 frame
9 rows
1 frame
9 rows
: BIP operation range B1: BIP-8 operation result of preceding
1,080 bytes
SOH
SOH
(ii)
B2 byte (Line BIP-96)
BIP-96 operation is performed on all the bits of the frames before frame scramble, except the bits on
the first through third lines of SOH, and the result of this operation is inserted in the B2 byte before
frame scramble of the next frame, and transmitted.
Before scramble
1 frame
9 rows
1 frame
9 rows
: BIP operation range B2
×
12: BIP operation result of preceding
1,080 bytes
3 rows
6 rows
36 bytes
B2
××××
12
AU pointer
Before scramble
AU pointer
Summary of Contents for NEASCOT-P65
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