78CHAPTER 6: SWITCH MONITORING AND MAINTENANCE

The Input LED (green) and Output LED (green) stay ON, but the display power command shows that the PSU is not in position (but the other PSU operates normally). Such a problem is likely caused because of the poor contact between the PSU and the backplane due to a badly seated PSU. In this case, switch off the power supply, loosen the captive screws on the PSU, push the PSU into the chassis a little bit, tighten the captive screws, and switch on the power supply to check that the normal state is resumed.

The Input LED (green) and Output LED (green) are OFF. In this case, check that the power cords are connected correctly, the power cords are in good condition, and the power switch has been put in the ON position.

The Fail LED (red) is ON. In this case, check that the correct power voltage is in use (i.e., 90 to 264VAC, 50-60 Hz for AC PSU).

The Fail LED (red) is ON. In this case, check that the air filter protecting the fan tray is clean. Excessive dust accumulated on the air filter will block the fan tray from free ventilation and even lead to power supply failure.

If you cannot solve the problem yet after going through the above checking steps, contact 3Com technical support engineers rather than disassembling the PSU yourself.

Troubleshooting Fan The Switch 8800 Family provides two LEDs on the fan tray. You can read them and Tray know if the fan tray is OK.

Table 74 Description of fan tray LEDs

Indicator

State description

 

 

RUN

Green indicates that the fan tray is normally operating.

 

OFF indicates that the fan tray has failed.

ALM

Red indicates that the fan tray has failed.

 

OFF indicates that the fan tray is in normal state.

 

 

n The ALM LED on the fan tray keeps ON for 2 to 3 seconds when the switch is powered on.

If the RUN LED is OFF, check if:

The fan tray has been well seated.

All the cables connecting the fan tray and the backplane have been correctly connected and are in good condition.

The fans are working normally.

The rotation of the fans has not been blocked.

The blank filler panels have been inserted into those I/O module slots.

Troubleshooting I/O The Switch 8800 Family provides I/O moduleX LEDs on the fabric for the user to Module observe the state of these I/O modules.

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3Com 8807, 8814, 8810 manual Description of fan tray LEDs, Indicator State description

8810, 8814, 8807 specifications

The 3Com 8814, 8810, and 8807 are renowned products from the networking giant 3Com, which played a significant role in the evolution of networking technology in the early 1990s. These devices were instrumental during a time when organizations were transitioning from traditional communication systems to more sophisticated networking solutions.

The 3Com 8814 is a multi-port networking hub designed for small to medium-sized businesses. One of its main features includes a 10Base-T Ethernet capability, allowing for fast and reliable connectivity among various devices within a local area network (LAN). The 8814 supports up to 14 connections, providing scalability for growing businesses. The hub’s ease of use is notable; it features a plug-and-play design, which aids in quick setup without requiring extensive configuration. This plug-and-play functionality, alongside its robust physical and electrical performance, made the 8814 an appealing choice for organizations looking to enhance their networking infrastructure without significant investment.

Moving on to the 3Com 8810, this device is labeled as an intelligent network switch and ushered in advancements in network management and performance. A critical element of the 8810 is its ability to support both 10/100Base-T Ethernet connections, effectively allowing mixed-speed environments. Its built-in management features, enabled by 3Com's networking technologies, offered users the ability to monitor traffic flow, manage bandwidth allocation, and configure network settings through a user-friendly interface. This switch also incorporated advanced features like VLAN support, increasing security and segmentation within networks, which proved invaluable for sophisticated networking environments.

Lastly, the 3Com 8807 represents a more versatile and high-performance switch option suited for larger networks. This model features a stackable design that allows for a broader range of scalability and redundancy. It supports both fast Ethernet and Gigabit Ethernet, ensuring that organizations can expand their network speeds as needed. The 8807 includes features for enhanced fault tolerance and link aggregation, which bolsters reliability and performance under heavy traffic loads. Its integration with 3Com's Network Management Software provided administrators with unprecedented control over their networks, empowering them to optimize performance and troubleshoot issues effectively.

Overall, the 3Com 8814, 8810, and 8807 exemplified the company's commitment to innovation in networking technology, providing businesses with the tools necessary to develop efficient, scalable, and reliable network infrastructures. Each of these devices played a crucial role in shaping the landscape of networking, emphasizing ease of use, management capabilities, and performance.