21030523120 Huawei Huawei OptiX Telecom System Card

The Huawei 21030523120 is an SLT1 (Subscriber Line Terminal) card designed to provide analogue subscriber line interfaces within Huawei OptiX optical transmission and access network equipment. This board enables the connection of traditional analogue telephone services over modern optical transport infrastructure.

The SLT1 card is typically deployed in Huawei OptiX SDH or MSTP platforms, where it serves as the interface between the optical network and end-user analogue telephony equipment. It is commonly used in telecommunications access networks to deliver POTS (Plain Old Telephone Service) to residential or business subscribers.

This is a legacy product associated with Huawei’s earlier generation of optical transmission systems. While these platforms remain in service across many carrier and enterprise networks, the SLT1 board is suited for maintenance, spares replenishment, or network extension where existing OptiX infrastructure is deployed.

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