Marconi Ericsson 1HAM60785AAY Marconi/Ericsson SMA/OMS/MSH86 SDH transmission systems Optical Transmission Module

The Marconi Ericsson 1HAM60785AAY is an unbalanced synchronisation Line Termination Unit for the Marconi SMA SDH multiplexer range, bringing an external timing reference into the shelf over an unbalanced 75-ohm coaxial interface rather than distributing timing purely from the aggregate line signal. External sync inputs of this kind are used where an SMA node needs to lock to a site’s building integrated timing supply (BITS) or a separate reference clock rather than relying solely on a recovered line clock, which matters for maintaining network-wide synchronisation across an SDH ring. It shares its plug-in format and general shelf position with the other SMA LTU cards covered in this listing, differing in interface function rather than physical fit. SMA equipment of this generation, inherited via GPT, Plessey and Marconi before passing to Ericsson in 2006, remains in service on established UK transmission networks. Confirm the exact timing configuration your shelf needs before ordering. Tech-Star (UK-based, shipped worldwide) stocks Marconi Ericsson SMA components to support ongoing network maintenance projects.