ROF1375339/11 R10J Ericsson Ericsson MD110 PBX Expansion Card

The Ericsson ROF1375339/11 R10J is an ELU 29 Extension Line Unit providing 16 analogue extension ports for Ericsson telephone exchange systems. This board enables connection of analogue telephone devices to the digital switching infrastructure, handling signalling and voice conversion for each connected line.

The ELU 29 is designed for deployment within Ericsson MD110 and AXE-based PABX systems, serving as a key component for expanding analogue extension capacity. It supports standard analogue telephone functionality including loop disconnect and DTMF signalling for connected devices.

This is a legacy Ericsson telecommunications product from the MD110/BusinessPhone era. While these systems have been superseded by IP-based platforms, significant installed bases remain operational globally, creating ongoing demand for replacement and expansion cards to maintain existing infrastructure.

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