How can Cisco IP phones receive both power and data using one Ethernet cable? Learn how Power over Ethernet (PoE) simplifies IP phone deployment and why it’s essential for Cisco Certified Field Technician (CCT) exam success.
Table of Contents
Question
A technician needs to configure a Cisco IP phone for power and data on a single Ethernet cable. What technology enables this?
A. QoS
B. VLAN trunking
C. PoE
D. Port mirroring
E. LLDP
Answer
C. PoE
Explanation
Power over Ethernet (PoE) allows both power and data to be delivered over the same Ethernet cable, eliminating the need for separate power adapters.
Power over Ethernet (PoE) is the technology that enables both electrical power and data to be delivered to Cisco IP phones over a single Ethernet cable. PoE allows network switches or dedicated injectors (power sourcing equipment) to transmit DC power alongside data signals through standard copper Ethernet cabling, eliminating the need for separate power adapters or electrical outlets at each phone location.
- PoE works by sending low-voltage DC power over the same twisted-pair cabling (such as Cat 5 or Cat 6) that carries Ethernet data, using either the data pairs or spare pairs in the cable.
- Cisco IP phones are designed to receive and use this power, simplifying installation and allowing for flexible placement anywhere there is network connectivity.
- This approach reduces cabling complexity, centralizes power management, and supports features like backup power during outages when connected to an uninterruptible power supply (UPS).
PoE enables Cisco IP phones to receive both power and data through a single Ethernet cable, streamlining deployment and maintenance in enterprise networks.
Cisco Certified Field Technician (CCT) certification exam practice question and answer (Q&A) dump with detail explanation and reference available free, helpful to pass the Cisco Certified Field Technician (CCT) exam and earn Cisco Certified Field Technician (CCT) certification.