ROF1375334/2 Ericsson Ericsson MD110 PBX Expansion Card

The Ericsson ROF1375334/2 is an ELU 28 Extension Line Unit providing 16 analogue extension ports for connection of standard analogue telephones and devices. This board serves as a key interface component within Ericsson’s business communication systems, enabling the integration of traditional analogue endpoints into the digital switching infrastructure.

The ELU 28 is designed for deployment in Ericsson MD110 and BusinessPhone PBX platforms, where it provides line interfaces for analogue extensions across enterprise telephony installations. Each port supports standard loop-start signalling for compatibility with a wide range of analogue devices including telephones, fax machines, and modems.

This is a legacy product from the Ericsson MD110 platform, which has been widely deployed in enterprise environments globally. While the platform has been superseded by more modern IP-based solutions, many MD110 systems remain in active service, creating ongoing demand for replacement and expansion boards such as the ELU 28.

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