Nortel NTNA77AC 01 (telecommunications transmission and networking portfolio) Telecom System Card / Module

The Nortel NTNA77AC 01 is a DC BIM (Battery Interface Module) card, decoded directly from its own part label, from the NTNA76-NTNA80 sequentially numbered card series. A battery interface module of this kind sits between a shelf’s active cards and the site’s DC battery plant, monitoring and distributing DC power feeds and typically carrying the associated power-fail alarm circuitry, which is a common role in Nortel transmission and access shelves running from -48V DC telecom power. Because this function is safety- and power-critical, a failed or missing DC BIM card can take an entire shelf’s power feed or alarm reporting offline, so genuine like-for-like spares are a routine requirement for maintaining shelf resilience. Equipment using this card format remains in service on legacy Nortel access and transmission installations. Specifiers should confirm exact shelf and slot compatibility against their specific configuration before ordering. Tech-Star (UK-based, shipped worldwide) stocks Nortel power-interface cards to support ongoing network maintenance projects.