Marconi/Nokia T31491.05 Nokia Synfonet / Marconi SDH transmission Optical Transmission Module

The Marconi/Nokia T31491.05 is a Synfonet core unit from the SAN group, the compact node variant of the platform. Documented builds under this base number combine the core function with 2 Mbit/s interfaces and dual short reach STM-1 optics, so this is the card that gives a small Synfonet node both its switching core and its tributary presentation. Impedance and optics vary between suffixes in this group and we would confirm those on the physical unit rather than from the code.

The Synfonet range covers SDH add and drop multiplexing and small cross connection at STM-1, STM-4 and STM-16, and it survives today mostly on private networks in transport, utility and public sector use. Nokia developed it, Marconi acquired it in 1999, and neither company supports it now, so every remaining site depends on the secondary market for plug-in units, subracks, power assemblies and fan parts. The suffix after the decimal point identifies the build variant and is not always interchangeable within one base number.

Give us the system details or a picture of the part label and we will physically check the match before despatch. Tech-Star is UK-based and ships worldwide. Please contact our sales team for current availability and pricing.