Q: What is a PoE Ethernet switch?
A: A Power over Ethernet (PoE) switch is a network device that delivers both data connectivity and electrical power over standard Ethernet cables. It eliminates the need for separate power sources for connected devices like IP cameras, wireless access points, or VoIP phones.
Velolan Networks provide full range of PoE ethernet switch, from unmanaged, web managed, to L2 and L3 managed, and 4/8/16/24/48 ports available for different applications.
Q: How does PoE work?
A: PoE injects low-voltage DC power into Ethernet cables alongside data signals. The connected device (e.g., a security camera) separates the power from the data, using it to operate without needing a separate power adapter.
Q: What are the key standards for PoE?
A: Common standards include IEEE 802.3af (PoE, up to 15.4W per port), IEEE 802.3at (PoE+, up to 30W), and IEEE 802.3bt (PoE++, up to 60W or 100W). These define power delivery capabilities and compatibility. Velolan Networks can also provide passive PoE switch for special requirements.
Q: What devices are typically powered by PoE switches?
A: Common devices include IP cameras, Wi-Fi access points, VoIP phones, intercoms, LED lighting systems, and IoT sensors.
Q: What is "PoE budget"?
A: The PoE budget is the total power (in watts) a switch can deliver across all ports. For example, a switch with a 150W budget can power ten 15W devices (802.3af) or five 30W devices (802.3at). Most of Velolan Networks PoE switches support BT90W per port for 1-4 ports.
Q: Can a PoE switch damage non-PoE devices?
A: No. PoE switches use a handshake protocol to detect PoE-compatible devices before delivering power. Non-PoE devices only receive data, ensuring safety.
Q: What is the maximum cable length for PoE?
A: The maximum recommended distance is 100 meters (328 feet) for both data and power transmission, using Cat5e/Cat6 cables. Beyond this, power loss and signal degradation may occur.Velolan networks can support long distance transmission for special projects.
Q: Do all ports on a PoE switch provide power?
A: Not necessarily. Some switches have only a subset of PoE-enabled ports. Contact Velolan networks to check specifications to confirm.
Q: Can I use a PoE switch with non-PoE switches?
A: Yes. PoE and non-PoE switches can coexist on the same network. Please notice only devices connected to PoE ports will receive power.
Q: How do I troubleshoot a device not receiving power from a PoE switch?
A: Verify the device is PoE-compatible. Ensure the switch’s PoE budget isn’t exceeded. Check cable quality and length. Test with another port or cable. Update the switch firmware if applicable.
Velolan Networks is always here to answer your questions about PoE Ethernet Switch.