Ericsson ROJ20725/1 AXE810 Optical Transmission Module

The Ericsson ROJ20725/1 is an ET155E HOT-O card, part of the ET155 family of STM-1 (155Mbps) optical transmission boards used within Ericsson’s AXE810 switching platform. ET155 boards handle STM-1 optical transport interfacing for the exchange, converting between the internal switch fabric and the STM-1 SDH optical network, and are fitted into dedicated ET155 magazines such as those found in Ericsson’s BFD 511 series racks. The ‘HOT’ designation on this card generally denotes a hot-standby or protection variant used for resilience within the ET155 magazine, working alongside its partner cards to maintain service continuity if a fault occurs. AXE810 exchanges equipped with ET155 optical transport hardware remain in service in a number of legacy transmission networks, and operators continue to maintain them with tested used parts as new stock is no longer produced. Tech-Star supplies the ROJ20725/1 as a tested pull from decommissioned Ericsson equipment, suitable for engineers who need a working replacement card, a hot spare, or stock to support an ongoing maintenance contract. Get in touch to confirm the exact revision and configuration required for your system before ordering.