Learn how electromagnetic interference (EMI) from a three-phase motor can cause high latency for users connected to an access switch through a Cat 6 cable. Discover the most likely cause of the issue and understand the importance of proper cable management in network environments.
Table of Contents
Question
An AP uses a 98ft (30m) Cat 6 cable to connect to an access switch. The cable is wired through a duct close to a three-phase motor installation. Anytime the three-phase is turned on, all users connected to the switch experience high latency on the network. Which of the following is MOST likely the cause of the issue?
A. Interference
B. Attenuation
C. Open circuit
D. Short circuit
Answer
A. Interference
Explanation
The most likely cause of the high latency experienced by users connected to the access switch is interference, specifically electromagnetic interference (EMI). The Cat 6 cable connecting the access point (AP) to the switch is routed through a duct near a three-phase motor installation. When the motor is turned on, it generates strong electromagnetic fields that can interfere with the data transmission in the cable.
EMI occurs when electromagnetic waves from an external source disrupt the normal operation of electronic devices or cables. In this case, the three-phase motor acts as the source of EMI, and its proximity to the Cat 6 cable allows the electromagnetic waves to couple with the cable, inducing noise and distortion in the data signals.
The resulting interference can lead to increased bit error rates, packet loss, and ultimately, high latency for the users connected to the affected switch. The latency occurs because the switch and connected devices need to retransmit corrupted or lost packets, causing delays in data delivery.
To mitigate the issue, the Cat 6 cable should be rerouted away from the three-phase motor installation or properly shielded to minimize the impact of EMI. Using shielded twisted pair (STP) cables or installing EMI-resistant conduits can help reduce the interference and improve network performance.
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