Nortel 25UTJ00728DAG (OPTera Metro / PDH-SDH / Passport-MSS / networking portfolio) Telecom System Card / Module

The Nortel 25UTJ00728DAG is a multiplexer tributary card, one of the plug-in units that give the PDMX shelf access to individual subscriber and trunk circuits. It belongs to Nortel’s PDMX family, a programmable digital multiplexer built as a complete transmission system for private-network operators carrying voice and data traffic over PDH (plesiochronous digital hierarchy) circuits, where a shelf’s common control unit interfaces to the 2 Mbit/s trunk and individual plug-in tributary cards give access to subscriber and other outlets. PDMX shelves of this generation are still found supporting legacy private circuits at utilities, transport operators and other private-network users who have not yet migrated off PDH transmission, and a genuine spare such as this is a routine requirement for maintaining shelf capacity or restoring a failed channel. Card revisions on this platform can vary between shelf software loads, so confirm exact compatibility against your installed system before ordering. Tech-Star (UK-based, shipped worldwide) tests refurbished Nortel spares of this kind before they go back into service. Please contact our sales team for current stock and pricing.