Lantronix
LSS2200-8P Install Guide
41
Mixing PoE and Non-PoE Devices
You can mix PoE and non-PoE devices on the same PoE switch (i.e., you can put PCs on the same PoE switch
as a SIP phone or a VOIP phone). The PSE (your switch) will only send power if requested by the PD.
Ethernet and PoE Intra-Building Cabling Warnings
1. Ethernet cables are intended for intrabuilding use only. Connecting your Lantronix switch directly to Ethernet
cables that run outside the building in which the switch is housed will void the user's warranty and could
create a fire or shock hazard.
2. PoE cables are intended for intrabuilding use only. Connecting your Lantronix switch directly to PoE cables
that run outside the building in which the switch is housed will void the user's warranty and could create a fire
or shock hazard.
3. For outdoor PoE applications, we recommend using Lantronix' SI-IES-1200-LRT Unmanaged Hardened
PoE+ Injector or SI-IES-111D-LRT Unmanaged Hardened PoE+ Injector/Converter Use of any other PoE
injector will void the user's warranty and could create a fire or shock hazard.
PoE Troubleshooting
Basic Steps
Try these simple steps first:
Verify that the PD accepts Power over Ethernet.
Check the PoE cabling.
Make sure PoE power is sufficient.
Make sure that the switch port is properly connected to the PD.
Check if PDs work on other PoE ports.
Check if other PDs work on this PoE port.
Check your RJ-45 outlet for power using a PoE AF/AT/BT tester.
Verify the PoE parameter selections in the Web Ui or CLI.
Check the port configuration parameters in the Web Ui or CLI.
Additional Steps
1. Note that this product is to be connected only to UL listed PoE networks and without routing to the outside
plant.
2. Note that PoE devices initially draw more power during their boot up sequence than during normal operation.
3. Determine what the requested power was at the time of failure.
4. Identify how long the device was operational and what events may have occurred at the time of the error to
help find the root cause (e.g., an IP phone that comes out of sleep and turns on fully may draw more power
momentarily).
5. Determine if there is an issue with the PD drawing too much power; check the PD vendor documentation to
determine why it exceeds the power it has negotiated with the switch.
6. Check the type and length of the cabling for any effect on the electrical characteristics and impact on the
amount of power drawn on a port.
7. Investigate the power negotiation and confirm that the power requested by a device is also the amount of
power that gets allocated. For example, using LLDP requires additional power budget for cabling between the
PD and the PSE.
8. Use power measuring and testing equipment to determine if the PD overdraws the amount of power it gets
allocated.