H31-341_V2.5 · Question #919
The calculation of BIP-8 belongs to one of the source functions of the OTUk layer.
The correct answer is A. True. A is correct because in OTN (ITU-T G.709), the OTUk layer's source function is responsible for computing the BIP-8 (Bit Interleaved Parity-8) value and inserting it into the Section Monitoring (SM) overhead of the outgoing OTUk frame - this is a defining transmit-side…
Question
The calculation of BIP-8 belongs to one of the source functions of the OTUk layer.
Options
- ATrue
- BFalse
How the community answered
(43 responses)- A74% (32)
- B26% (11)
Explanation
A is correct because in OTN (ITU-T G.709), the OTUk layer's source function is responsible for computing the BIP-8 (Bit Interleaved Parity-8) value and inserting it into the Section Monitoring (SM) overhead of the outgoing OTUk frame - this is a defining transmit-side operation. The source function generates the parity across the frame payload so the far-end sink can later compare it against a fresh calculation to detect bit errors. B is incorrect because BIP-8 calculation is not a sink-side operation - the sink verifies the pre-inserted BIP-8 (and reports anomalies like BIP violations), but it does not calculate and insert it; those steps belong exclusively to the source.
Memory tip: Think Source = Stamp it (calculate and insert BIP-8), Sink = Score it (verify and count errors). The transmitter does the math; the receiver checks the work.
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