Nortel 25UMU00750HUJ (OPTera Metro / PDH-SDH / Passport-MSS / networking portfolio) Telecom System Card / Module

The Nortel 25UMU00750HUJ is a plug-in unit from the Nortel TN-1X, the STM-1 add and drop multiplexer used across SDH access networks. Part numbers in the 25U 00750 series belong to that platform. Our supplier record labels this one ATV and gives nothing further, so we have not expanded the abbreviation into a function. Beyond that designation our record is silent, and the release the unit carries needs confirming against the item itself rather than assumed from the code.

The TN-1X is Nortel’s STM-1 add and drop multiplexer, installed widely across UK and European SDH access networks. A node is built up from a subrack of plug-in units: the subrack controller, a mixed payload manager, 2 Mbit/s and 34/45 Mbit/s tributary units, STM-1 optical and electrical tributaries, traffic access modules and a power supply. Keeping one in service means sourcing the exact unit rather than replacing the system.

Send us the platform and slot you are filling, or a picture of the front panel legend, and we will confirm the match physically before anything ships. Tech-Star (UK-based, shipped worldwide) sources and supplies Nortel hardware to order. Get in touch with our sales team for availability, tested condition and a price.