Select Page




Industrial Ethernet-unmanaged electric and fiber network switches with 2 electric port and 1 fiber port. Plug and play, simple and reliable, quickly realize the expansion function of the network port, and enhance the reliability and security of the industrial network.

  • Support 2 Ethernet ports (electrical ports) and 1 fiber port, 10/100Mbps rate adaptation.
  • Support level 4 electrostatic protection, level 4 power surge protection, level 3 network port surge protection, IP40 and other advanced protection.
  • Phoenix terminal power interface.
  • Support 10-58V wide voltage, natural heat dissipation, DIN-Rail mounting
Model USR-SDR021
Interface Power interface Phoenix terminal, redundant dual power supply
Network interface 10/100 Base – T
Ethernet port number 2*10/100M,1*100 Base-FX
LED indicators PWR,Link/ACT
Cable type Twisted-pair 100m(CAT5E, CAT6)
Monomode optical fiber 20/40/60/80/100KM
Multimode (optical) fiber 550m
Electrical specifications Input voltage DC 10-58V
Power consumption Normal model<5W; POE model<65W
Network Topology Star topology support
Bus topology support
Tree Topology support
Parameters MAC address table 1K
Buffer 512K
Forwarding delay <3us
MDX/MIDX support
Flow control support
Jumbo frame 2048 bytes
Switching capacity 1G
Packet forwarding rate 0.744Mpps
EMC&Ingress protection IP level IP40
Power surge protection IEC 61000-4-5  Level 3(4KV/2KV)(8/20us)
Ethernet port surge protection IEC 61000-4-5  Level 3(4KV/2KV)(10/700us)
ESD IEC 61000-4-2  Level 4(8K/15K)
Free fall 0.5m
Environment Operating temperature -40℃~+85℃
Storage temperature -40℃~+85℃
Relative humidity 5%~95%,(non-condensing)
MTBF MTBF 100000 hours
Mechanical structure Size 143X104X48mm
Installation method DIN rail
Shell material Aluminium alloy
Weight 0.52kg