Single-row electrical wire structure

A single-row electrical wire structure, comprising:

• a first circuit board, wherein a board-to-board connector is on the first circuit board;
• the first circuit board comprises a first group of contacts arranged into a single row, a distance between center portions of adjacent two contacts of the first group of contacts forms a width;
• and
• a wire assembly, comprising a plurality of high-speed signal pairs and a plurality of low-speed signal pairs, wherein two ends of each of the high-speed signal pairs and two ends of each of the low-speed signal pairs are connected to the first group of contacts, a first spacing between a contact in the first group of contacts corresponding to a first high-speed signal pair of the high-speed signal pairs and a contact in the first group of contacts corresponding to a second high-speed signal pair of the high-speed signal pairs adjacent to the first high-speed signal pair is at least equal to or greater than 2 times of the width, and a second spacing between a contact in the first group of contacts corresponding to a first low-speed signal pair of the low-speed signal pairs and a contact in the first group of contacts corresponding to a second low-speed signal pair of the low-speed signal pairs adjacent to the first low-speed signal pair is at least equal to or greater than 1.5 times of the width.