Marconi 1HAM60798ABN ESR/ESX routing switches and SDH/PDH transmission systems Optical Transmission Module

The Marconi 1HAM60798ABN is a line termination unit for the 140 and 155 Mbit/s rates, and it is listed under exactly this code in published Marconi parts data as LTU 140/155. It terminates the highest of the tributary rates the SMA shelves handle, covering both the 140 Mbit/s PDH circuit and the 155 Mbit/s STM-1 electrical presentation. The ABN suffix marks the build issue and is worth quoting when you order.

The SMA multiplexers are Marconi SDH equipment with roots in GPT and Plessey, and they are still carrying traffic on utility, rail and private networks in the UK. A shelf combines line termination units for the tributary rates in use, optical aggregate interfaces, a system controller, alarm collection and local craft access, and dual power feeds. The 1HAM and 1HAT prefixes on the part numbers separate the unit families, and the trailing letters mark the build issue.

If you can give us the model or the release you are matching, we will confirm what we hold before anything ships. Tech-Star is UK-based and ships worldwide. Contact our sales team for current stock, condition details and pricing.