Ruijie RG-AP820-I Installation And Reference Manual page 43

Hardware Installation and Reference Guide
7.4
Power Supply

DC power adapter:
Input voltage: 48 V
Rated current: 0.6 A
Table 7-3 Technical Specifications of the DC Power Connector
Inner Diameter
2.1 mm (0.08
in.)
Figure 7-8 Size of DC Power Adapter
Outer Diameter
5.5 mm (0.25 in.)
Depth
10 mm (0.39 in.)
35
Appendix
Polarity
Inner pole: positive
Outer pole: negative