# Bit-sequence independence

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In [telecommunications](/source/Telecommunications), **bit-sequence independence** is a characteristic of some [digital](/source/Digital_data) [data transmission](/source/Data_transmission)[1] as well as *digital transmission*[2] systems that impose no restrictions on, or modification of, the transmitted [bit](/source/Bit) [sequence](/source/Sequence).

Bit-sequence-independent protocols are in contrast to protocols that reserve certain bit sequences for special meanings, such as the [flag sequence](/source/Flag_sequence), 01111110, for [HDLC](/source/HDLC), [SDLC](/source/Synchronous_Data_Link_Control), and [ADCCP](/source/ADCCP) protocols.

Bit-sequence-independence allows only line codes that have the same number of transitions per bit, otherwise, the line code is dependent on the bit sequence and, therefore, bit-sequence dependent.

## References

1. A. P. Clark, "Principles of Digital Data Transmission", Published by Wiley, 1983

1. David R. Smith, "Digital Transmission Systems", Kluwer International Publishers, 2003, ISBN 1-4020-7587-1. See [table-of-contents](https://www.amazon.com/dp/1402075871).

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