Tele-Communication (Telecom) Terms Glossary and Dictionary
STS-N: Synchronous Transport Signal level N
Synchronous Transport Signal Level N (STS-N) refers the basic logical building block signal of synchronous optical networks (SONET) data rate. There are 5 different data rates currently available and denoted as STS-N where N = 1,2,12,48, and 192). The STS-1 signal is known as the SONET basic rate (data rate of 51.84 Mbps) and is designed to carry one DS-3 Signal (the most popular long-haul digital signal in North America).