Power Sourcing Options
Power Considerations
The EISW can be powered from either a single source of AC or DC. Dual source power-
ing is possible with two DC supplies isolated from one another. Recommended size for
solid power conductors is 16–22 AWG; for stranded conductors, use 16–18 AWG. Input
connections are reverse polarity protected. The earthing screw terminal on the switch
must be grounded if there is no other option for grounding the case.
Network Connections
The switch employs Auto-MDIX technology so that either straight-through or crossover
cables can be used to connect to network interface adapters or to another hub.
LED Indicators
The “P1” LED glows green to indicate Power Input 1 (PWR1) has power, and the “P2”
LED glows green to indicate Power Input 2 (PWR2) has power. Each Ethernet port has
a LNK/ACT LED that glows solid green to indicate an established 10 or 100 Mbps link,
and flashes green to indicate that network traffic is occurring over that port.
Single Source Powering
PWR1 with AC
PWR1 with DC
12-48
VDC
+
12-48
VDC
+
12-48
VDC
+
*
V1+
1 2 3 4 5 6
V1-
PWR1
V2+ V2-
PWR2
Fault
V1+
1 2 3 4 5 6
V1-
PWR1
V2+ V2-
PWR2
Fault
V1+
1 2 3 4 5 6
V1-
PWR1
V2+ V2-
PWR2
Fault
24
VAC
Primary
* Possible grounded secondary.
Redundant Powering
PWR1 with DC
PWR2 with DC
Power supplies must be
isolated from each other.
