User’s Manual of POE-1200G / POE2400G
APPENDIX A
A.1 MDI Settings
The Medium-Dependant Interface (MDI or RJ-45) serves as the data/power interface between Ethernet elements. As such,
it has two optional connection methods, to carry the power. Named Alternative A & B. Table 1 details the two power feeding
alternatives.
Pin Alternative
A Alternative
B
1
Vport Negative
2
Vport Negative
3
Vport Positive
4
Vport
Positive
5
Vport
Positive
6
Vport Positive
7
Vport
Negative
8
Vport
Negative
Table -1 Alternative Table
Delivering power through an RJ-45 connector’s center tap (“Phantom Feeding”) guarantees that bi-directional data flow is
maintained, regardless of a module’s power status.
A.2 Power Device Classification values
Class PD Current – Classification Period
[mA]
PD Power – Operation Period
[W]
Note
0
0 – 4
0.44 – 12.95
Default
1
9 – 12
0.44 – 3.84
Optional
2
17 -20
3.84 – 6.49
Optional
3
26 – 30
6.49 – 12.95
Optional
4
36 - 44
Future use
Future use
55
