BIP-8 (alternatively, BIP8) is an abbreviation for ''bit-interleaved parity 8''. BIP-8 consists of a
parity byte
The byte is a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single character of text in a computer and for this reason it is the smallest addressable un ...
calculated bit-wise across a large number of bytes in a transmission transport frame. BIP-8 bits are set such that the overall data stream, including the BIP-8 byte, has even parity.
BIP-8 is used in the
SONET/SDH
Synchronous Optical Networking (SONET) and Synchronous Digital Hierarchy (SDH) are standardized protocols that transfer multiple digital bit streams synchronously over optical fiber using lasers or highly coherent light from light-emitting diod ...
and
Optical Transport Network standards, as well as in some older
PDH framing schemes such as
DS3 and
E3.
BIP-8 has no
error-correcting functionality: like the
CRC-6 bits in the much older
extended superframe
In telecommunications, superframe (SF) is a T1 framing standard. In the 1970s it replaced the original T1/D1 framing scheme of the 1960s in which the framing bit simply alternated between 0 and 1.
Superframe is sometimes called D4 Framing to ...
format, it merely provides an approximate method for monitoring link quality at the bit error level.
See also
*
Errored second
References
Network protocols
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