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HG821-3PU-100IPEX HG821-3PUSQ-100IPEX HG8245 EPON HG8245 GPON SFP(H248) HG8245F E8C for EPON HG8245R HG8245R EPON BOB HG8245R GPON BOB HG827-03PU-100IPEX HG82C51N