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Huawei ES5D21Q04Q014 Port 40 Gig QSFP+ Rear Interface Card
PAC-600WA-B 600 W AC Power Module for S6720-EI series
PDC-350WA-B 350 W DC Power Module for S6720-EI Switch
Huawei W0PSA1701 supports 170 W AC Power Module apply to S5700 series switch