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Q
What is a Cisco PoE Injector?
A
A Cisco PoE Injector is a network accessory that supplies Power over Ethernet (PoE) to devices such as IP phones, wireless access points, and cameras without requiring a PoE-capable switch.
Q
How does a Cisco PoE Injector work?
A
A Cisco PoE Injector inserts DC power onto the Ethernet cable’s data pairs, enabling connected devices to receive both data and power through a single Cat5e/Cat6 cable.
Q
Which devices are compatible with Cisco PoE Injectors?
A
Cisco PoE Injectors are compatible with any IEEE 802.3af/at-compliant device, including Cisco IP phones, access points, security cameras, and third-party PoE endpoint devices.
Q
What are the power output specifications of Cisco PoE Injectors?
A
Cisco PoE Injectors deliver up to 15.4 W per port for 802.3af (PoE) and up to 30 W per port for 802.3at (PoE+), ensuring sufficient power for a wide range of network devices.
Q
What is the maximum cable length supported by Cisco PoE Injectors?
A
Cisco PoE Injectors support a maximum Ethernet cable length of 100 meters (328 feet) per IEEE standards, covering typical enterprise and campus deployments.
Q
How do I install a Cisco PoE Injector?
A
To install, connect your non-PoE switch to the injector’s data “IN” port, then link your PoE device to the injector’s “OUT” port and power the injector via AC mains.
Q
Can a Cisco PoE Injector power multiple devices?
A
No – each Cisco PoE Injector typically powers one device; to support multiple endpoints, deploy a Cisco PoE switch or multiple injectors.
Q
What are the differences between Cisco PoE and PoE+ Injectors?
A
Cisco PoE (802.3af) injectors deliver up to 15.4 W per port, while PoE+ (802.3at) injectors provide up to 30 W per port, enabling support for higher-power devices.
Q
Do Cisco PoE Injectors support IEEE 802.3at and 802.3af standards?
A
Yes – Cisco PoE Injectors comply with both IEEE 802.3af and 802.3at standards to ensure interoperability and reliable power delivery to compliant devices.
Q
How do I troubleshoot a Cisco PoE Injector?
A
Check LED status indicators for power and port activity, verify cable integrity and length, confirm device compatibility, and review the injector’s specifications against the device’s power requirements.
Q
What safety features do Cisco PoE Injectors have?
A
Cisco PoE Injectors include overcurrent protection, short-circuit protection, and thermal shutdown to safeguard both the injector and connected devices.
Q
How do I choose the right Cisco PoE Injector for my network?
A
Select a Cisco PoE Injector based on your device’s power requirements, the IEEE PoE standard needed (802.3af vs. 802.3at), and cable distance to ensure reliable operation.
Q
Can Cisco PoE Injectors be used with non-Cisco equipment?
A
Yes – as long as the non-Cisco equipment adheres to IEEE 802.3af/at standards, a Cisco PoE Injector will deliver power and data without compatibility issues.
Q
How energy-efficient are Cisco PoE Injectors?
A
Cisco PoE Injectors feature high-efficiency power conversion (up to 90%) and intelligent power management to minimize energy waste and lower operational costs.
Q
What are the typical use cases for Cisco PoE Injectors?
A
Common use cases include powering remote wireless access points, IP video cameras, VoIP phones, and any network device located beyond the reach of a PoE switch.
Q
Where can I find Cisco PoE Injector firmware updates and support?
A
Firmware updates, data sheets, and technical support for Cisco PoE Injectors are available on the Cisco Support & Downloads portal at www.cisco.com/go/support.
