010101010101010

010101010101010 is a binary string consisting of alternating bits, beginning with 0 and continuing for 15 positions. The sequence is exactly 010101010101010, and its length is 15.

It has 14 bit transitions, since every adjacent pair differs. This makes it the pattern with maximum transitions for a 15-bit sequence. The string contains eight zeros and seven ones, with the last bit being 0.

In digital electronics and communications, such alternating patterns are commonly used as simple test vectors. They help evaluate edge detection, clock recovery, line coding schemes, and the behavior of logic elements under rapid bit changes. They are also used in hardware and software testing to exercise timing, bonding, and data path contention, and to probe for pattern-sensitive faults on data lines when performing memory or bus tests. While not representative of typical data, these patterns can reveal problems that may not appear with random or uniform data.

A related sequence is its complement, 101010101010101, which starts with 1 and similarly alternates every bit. Both patterns are often cited in discussions of test patterns and coding schemes as examples of maximum signaling activity over a short interval.