According to Wikipedia, STM-1 (also known as SDH or OC-3) is a standardized multiplexing protocol that transfers multiple digital bit streams over optical fiber using lasers or light-emitting diodes (LEDs) with a transmission speed of up to 155.52 Mbit/s.

TelcoBridges and STM-1

TelcoBridges provides support for STM-1 connectivity with its Tmedia (TMG3200, TMG7800), Tdev TMP6400, and Tmonitor (TM3000) devices. This includes support for both electrical and optical variants.

TelcoBridges also provides support for Automatic Protection Switching.