Connector having signal contacts and ground contacts in a specific arrangement

Claim 1

A connector having a first end for fitting to another connector and second end for connecting to a board, comprising: an insulator; plural contacts held by said insulator, said contacts being arranged at said first end in two rows to make a staggered fashion between said two rows and arranged at said second end in three rows to make a staggered fashion between adjacent ones of said three rows, said contacts comprising plural signal contacts and plural ground contacts, each of said ground contacts having a single contact portion at said first end, said first end having plural contact sets in each of which two of said signal contacts and said single contact portion of one of said ground contacts are located at three apexes of an isosceles triangle at said first end, respectively, said signal contacts being arrayed on each of outer ones of said three rows at said second end, said ground contacts being arrayed on a middle one of said three rows at said second end, two of said signal contacts on one of said outer ones of the three rows and one of said ground contacts on said middle one of the three rows making one of said contact sets and being located at three apexes of an isosceles triangle at said second end, respectively, a plurality of + signal contacts; and a plurality of − signal contacts; said contacts being arranged in a manner such that a set of each single one of said + signal contacts, each single one of said − signal contacts, and each single one of said ground contacts are located at three apexes of an isosceles triangle, respectively, wherein said + signal contacts, said − signal contacts, and said ground contacts are arranged at a predetermined pitch, a plurality of transmission cables being connected to one of said + signal contact and said − signal contact.