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Tele-Communication (Telecom) Terms Glossary and Dictionary
STM-4: Synchronous Transmission Module level 4
Synchronous Transmission Module level 4 (STM-4) is one of the transmission mode of the SDH ITU-T fiber optic network transmission standard. It has a bit rate of 622.08 Mbit/s and is the SDH equivalent of an OC-12 (SONET).
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