Question 1
IntermediateBasic Data Communications and Technical Knowledge of the Internet · Basic Data and Telephony Network Concepts
A telecommunications consultant is migrating a legacy analog PBX system to a converged Voice over IP (VoIP) architecture for a regional logistics hub. The facility experiences frequent micro-outages. When calculating the power distribution strategy for the new converged network, which fundamental difference between traditional telephony and data equipment must the consultant account for to ensure continuous voice services?
Answer and explanation
Correct answer: C
This is correct. In traditional telephony, the central office provides -48V DC power directly over the copper tip and ring wires, meaning phones work even if the building loses power. In a converged VoIP network, the IP phones and network switches rely on local AC power (often delivered via PoE from the switch). Therefore, local UPS systems are strictly required to maintain voice service during a power failure.
