Design Guide — Doc. 9292A
Cresnet® Network • 23
External Power Supplies
A Cresnet server supports cumulative wire runs up to 1,500 ft (457 m). However, due to voltage
loss over longer distances, the internal Cresnet power supply in the Cresnet server may not
provide enough power for longer wire runs.
In these scenarios, adding external power supplies (
and
) ensure that
enough power is provided across longer wire runs. The Cresnet cable runs from the Cresnet
server to the power supply using only three of its four wires (Y data, Z data, and ground;
24VDC is not connected). Another Cresnet cable is run from the power supply to the Cresnet
client with all four wires connected.
NOTE: To determine the wire gauge required for a wiring run between power supply and
Cresnet client, only calculate the distance between the power supply and Cresnet client. The
wiring run between the Cresnet server and power supply is not included in this calculation.
For more information, refer to
Resistance Equation Formula (on page 21)
.
If a Cresnet network needs to be expanded beyond 1,500 ft (457 m), a Cresnet hub or
Ethernet-to-Cresnet bridge is required.
