ROF1575018/3 Ericsson MD110 PBX Expansion Card

The Ericsson ROF1575018/3 is a BTUP (Basic Tie-line Unit for PCM) tie line card designed for Ericsson telephony systems. This card provides digital tie line connectivity, enabling inter-PBX communication over PCM (Pulse Code Modulation) trunk circuits between multiple telephone exchanges or switching systems.

The BTUP tie line card is engineered for deployment within Ericsson MD110 and BusinessPhone PBX environments. It facilitates the connection of private branch exchanges across different sites, supporting corporate telephony networks that require dedicated inter-office voice communication paths.

This is a legacy product from Ericsson’s enterprise telephony portfolio, which has since transitioned through various ownership changes. Despite its discontinued status, the ROF1575018/3 remains in demand for organisations maintaining existing MD110 installations or requiring spare components for established PBX infrastructures.

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