huawei transmission equipment sdh multiplexer osn7500 pdh

华为osn7500

sdh/ason osn3500/7500设备2×10g 光线路板 ssnd0sld64

华为智能光传输设备osn7500

mstp osn7500 ssn1dcu series osn3500 ssn1dcu(60km/60km lc)