zero voltage switching or zero current switching

zero voltage-switching ZVS zero-current-switching

zero voltage-switching(ZVS)zero-current-switching(ZCS)

Layer2 Forwarding

Layer2 Management Link L2ML

Layer2 protocol

Layer2 Relay L2R

layer2 switch

Layer2 VPN

Layer3 Mobility Management L3MM

Layer3 switcher

Layer3 VPN

Radio Interface Layer3 RIL3

(1+1)switching protection

1+1 switching solution

1×N electro-optical switching

10kV standby power supply automatic switching device

18-pulse switching mode

220 kV switching station