The Huawei ISV3 is an Interface and Service Vector Processing Unit board used in Huawei’s OptiX OSN series of transport network equipment. It functions as a multi-service adaptation and processing card, primarily handling E1 and CPOS (Channelized POS) interfaces. Its key role is to aggregate and groom multiple lower-rate TDM signals (like E1 lines from 2G/3G base stations) onto a higher-capacity SDH/SONET or OTN optical link. This makes it a crucial component for integrating legacy TDM traffic with modern packet-based transport networks.

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