Contemporary Control Systems Compact Unmanaged Switches - Manual (Page 3)

Power Considerations
Voltage in the range of 10–36 VDC or 8–24 VAC must
deliver current commensurate with power consumption.
Power conductors can be stranded (16–18 AWG) or
solid (16–22 AWG). Zero volts and the chassis are
isolated from each other. Input connections are reverse-
polarity protected. Primary power backup for a substitute
DC supply or backup battery is possible by way of built-in
redundant diode-isolated inputs, but separate provisions
are required for charging any backup battery.
LED Indicators
To aid troubleshooting, each port LED glows solid if a link
exists, flashes to show activity and shows data rate by
colour: green for 100 Mbps and yellow for 10 Mbps. A
power LED is provided.
Network Connections
Cabling requirements appear in the table below. With
the Auto-MDIX feature, either crossover or standard
straight-through cables may be used to connect to any
copper port. When connecting fibre between one device
and another, the transmit port of one unit must connect to
the receive port of the other unit — and vice versa. Half-
duplex operation is not supported on the fibre port.
Power Options
The EICP can be
powered in various
ways as illustrated
below :