Patent ID: 6369921
Filing Date: 2002-04-09
Classification: H04L,Y10S

Abstract:
Parity determining apparatus for determining the parity of a binary word, the binary word being represented by a sequence of W optical bit slots, each bit slot defining a respective one of first and second complementary logical states, the apparatus comprising:an input pulse stream generator which generates copies of the W bit slot word; a combining means which receives first and second binary words, offsets the first and second binary words by one bit slot and combines the relatively offset first and second binary words to form a combination word; and, means for applying P times in succession a copy of the W bit slot binary word and the previously generated combination word to combining means, whereby the parity of the first P bit slots of the W bit slot word are given by the first P bit slots of the resultant combination word, the first combination word comprising a sequence of optical bit slots having the same logical state.