Nortel NTMN37BC70E6 (telecommunications transmission and networking portfolio) Telecom System Card / Module

The Nortel NTMN37BC70E6 is a Key-Based Expansion Module (KEM) for the Meridian M3900-series digital telephone, confirmed as an exact match for this part number: it adds 22 additional programmable keys with busy-lamp-field indicators to a compatible M3900-series set such as the M3904 or M3905, and includes its own LCD status display so each added key’s state can be read at a glance. Up to two KEMs can be fitted to one phone for a total of 44 additional keys, which is typically used by receptionists, attendants or heavy-line-load users who need more direct-line or feature-key coverage than the base handset provides. As an add-on accessory rather than a core telephone component, genuine KEMs such as this one are a routine requirement for expanding an existing M3900-series deployment or replacing a damaged expansion module. Tech-Star (UK-based, shipped worldwide) stocks Nortel Meridian components to support ongoing system maintenance. Please contact our sales team to confirm exact compatibility and for current stock and pricing.