18.91.8.230.0042 18.937500(X-TAL) 18.9375MHZ 18.9375MHZ +/-10PPM 20PF 18.A1.8.230.0000 18.KSZ8081MNXCA-TR 18.ZN3R3AMT4 18/22 18/22CDC.41.B4 18/22CDC.99.B4