The STM-4 (Synchronous Transport Module level-4) is a transmission rate defined within the Synchronous Digital Hierarchy (SDH), a set of optical network standards specified by the International Telecommunication Union Telecommunication Standardization Sector (ITU-T). The SDH frame structure and. This article compares the capacity and speed of STM0, STM1, STM4, STM16, STM64, and STM256. We'll explore the differences between these Synchronous Transport Modules (STMs) concerning their data-carrying capabilities. Depending on the cable type (multimode or single-mode fiber), wavelength (850 nm, 1310 nm, 1550 nm or CWDM/DWDM) and data rate, the SFPs are available in. Good quality 622Mbps CWDM SFP Transceiver Module (SMF, 1270~1610nm, 80km, LC, DDM). Optcore's OPC622-xx80DCR is a high performance and cost-effective CWDM (Coarse Wavelength-Division Multiplexing) SFP transceiver module for SDH STM-4/SONET OC-12 and 622Mb/s ATM long reach the application, which. Product Custom Request FS Product Customis a customized service provided by FS to meet customers' hardware and software development needs, including product compatibility and software feature development for PicOS®, AmpCon, and transceivers. Add to Cart Specifications Q&A Reviews Resources. The SLQ4 transmits and receives STM-4 optical signals, performs O/E conversion for the STM-4 optical signals, extracts and inserts overhead bytes, and generates alarm signals on the line.