Again in 1990, the company went through a major technical overhaul with the replacement of the step-switch with a “Digital Switch”. The digital switch occupied less than half the area of the mechanical switch and increased both efficiency and reliability by a significant factor when it went live on December 1st of that year. The digital switch remained in service and near-continuous operation for almost 30 years until it was replaced in 2018 by an IP switch less than 5% of its size.