24 • Cresnet® Network
Design Guide — Doc. 9292A
Appendix A: Troubleshoot Cresnet IDs
Occasionally, a Cresnet client may change its Cresnet ID within the Cresnet network if it has
received data with corrupt data packets over the connected Y and Z data wires.
To determine whether a Cresnet client is receiving corrupt data packets, use the
Network Analyzer tool in Crestron Toolbox software as described in the
to determine the error(s). The following sections describe common ways in which data
packets may get corrupted.
Insufficient Power
Insufficient power is the most common cause for corrupt data packets. As Cresnet systems
become increasingly complex, integrators must ensure that enough power is supplied for all
Cresnet clients in the system. For more information on power requirements, refer to
l
Use the
Cresnet Power Calculator (on page 20)
to determine the total power
requirements for all client devices on a given leg of the Cresnet network. The total power
requirements must not exceed the power supplied by Crestron servers or external power
supplies on that leg.
l
If using a C2N-SPWS300 (300 W) power supply, ensure that each segment does not draw
more than 75 W and that the total power draw across the power supply does not exceed
300 W.
l
If using a CNPWS-75 (75 W) power supply, ensure that the total power draw across the
power supply (for all devices connected to the 24VDC connector) does not exceed 75 W.
l
For control systems, the internal power supply provides additional power for Cresnet
devices that are wired directly to the control system's 24VDC connector. For more
information on the power supplied by a particular control system model, refer to its
product page at
.
Incorrect Wire Gauge
When selecting a wire gauge (in AWG) that will be used to supply power to a Cresnet client, the
wire gauge resistance value must not exceed the resistance value required by the client device on
the network. For more information on calculating the correct wire gauge, refer to
Power Requirements for Wire Runs (on page 21)
.
Incorrect Wiring
Typically, incorrect wiring only occurs when wiring is used in a Cresnet network that is not
Crestron certified (such as CAT5e cable). For an overview on Cresnet wiring requirements and
supported Cresnet cables, refer to
Wiring and Connectors (on page 14)
.
