Use the Console to confirm if the corresponding port is LinkDown using the show interface status command. Use the command to reset the faulty port. This document describes how to troubleshoot fiber optic interfaces by addressing some of the fiber optic module and cabling specifications. The information in this document is based on all Catalyst 9000 Series switches. Hello, from your output I can't see which type of QSFP you have installed, your QFX discovers. Tip #1: How can we distinguish between the SFP module's RX and TX ports? The triangle indicates the Tx (transmit) port with the pole facing outward on the SFP module, whereas the. When the Status light is red, you can use a PC super terminal to confirm whether the switch's software is running normally. During the switch's boot process, all panel. Connection is from a fiber modem to the switch and from there cables to PC, TV-box and Philips Hue Hub. If I take the cable from the modem that is connected to the switch and connected directly to any of the mentioned devices ther e is no problem but if i connect all the devices from the switch. As core components in high-speed data networks, optical transceivers enable communication between switches, routers, and servers through fiber optic links. Despite their robust design, these modules can experience failures due to environmental stress, contamination, or incompatibility.