ROF1375412/3 Ericsson Ericsson AXE Telecom System Card

The Ericsson ROF1375412/3 is an ELU 31/3 (Extension Line Unit) printed board assembly designed for use in Ericsson AXE digital telephone exchange systems. This circuit board provides subscriber line interface functionality, enabling connection of extension lines to the switching system.

The ELU 31/3 board is deployed within AXE exchange environments to handle subscriber line termination and signalling. It forms part of the subscriber stage hardware, managing the interface between end-user telephone lines and the central switching fabric of the exchange.

This is a legacy component from the Ericsson AXE platform, which was widely deployed by telecommunications operators globally. Whilst the AXE architecture has been superseded by modern packet-switched systems, many installations remain operational and require spare parts for ongoing maintenance and support.

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