PoE Switch for VoIP Phones
Which of the following devices can provide combined data and power to hardwired VoIP phones in a small office?
Community Insight
This question tests knowledge of networking hardware capabilities, specifically identifying Power over Ethernet (PoE) switches as the solution that eliminates the need for separate power adapters.
A PoE switch is the correct device to provide both data connectivity and electrical power to hardwired VoIP phones in a small office environment.
Learners often confuse PoE switches with standard routers or optical terminals, failing to recognize that only specific PoE-enabled ports can deliver electricity alongside network data.
Community Discussion (1 comments)
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Expert Analysis
Why the Answer Is Correct
A PoE (Power over Ethernet) switch is designed to transmit data and electrical power simultaneously over standard Ethernet cabling. This feature is ideal for devices like VoIP phones, wireless access points, and IP cameras, as it simplifies installation by removing the need for local power outlets.Why the Other Options Are Wrong
An injector is typically used to add PoE capability to a non-PoE switch but is less common as a primary central device in a modern SOHO compared to a PoE switch. An Optical Network Terminal (ONT) converts optical signals for internet service and does not inherently provide PoE for internal devices. A router manages traffic between networks but generally does not supply power to connected devices unless it has integrated PoE ports, which is not its defining characteristic.Community Comment Notes
The community consensus strongly supports option B, noting that a PoE switch efficiently sends both network data and electricity to VoIP phones through Ethernet cables, streamlining the setup process.Exam Strategy
When troubleshooting or designing a small office network, look for keywords like 'combined data and power' or 'eliminate power cords'. If these appear, immediately consider PoE switches as the primary solution for powered devices.
Frequently Asked Questions
Can a regular switch provide power to VoIP phones?
No, a standard switch only transmits data. Only a PoE-enabled switch can deliver the necessary electrical power over the Ethernet cable.
What is the difference between a PoE injector and a PoE switch?
An injector adds PoE capability to a single port on a non-PoE switch, whereas a PoE switch has multiple ports that natively support power delivery.
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