There are various parts of a network that can go wrong. You have to make sure that every part of the network functions correctly including the network adapters, cables, connectors, switches, hubs, routers, etc. Network hardware isn't the only thing that needs to be setup correctly; there may be software issues as well.
Here we'll talk just about some hardware aspects of a hub. A hub and a switch have practically the same function. Switches have replaced hubs, so if finding good troubleshooting for a hub is hard, try doing a search for an Ethernet switch- the information can easily be applied to a hub.
The speed of your network will only operate as fast as your slowest component if you have a 10/100 Megabit per second hub. If you have an old computer with a 10 Megabit per second (Mbps) network adapter consider upgrading to a 100 Mbps network adapter.
The length of cable also plays a role in the speed of the network. The maximum length for a RJ-45 cable for a 10 or 100 Mbps network is 328 feet. The length of cable between two 10/100 Mbps routers needs to be 15 feet or shorter.
Check how your cables are positioned if you have long cables. Make sure your network cable isn't coiled or bound together. This can create electromagnetic fields that will disrupt data transfer between the two Ethernet ports.
It's important to route your Ethernet cables properly. Try to avoid placing cables near lights, power outlets, and power supplies. These may create strong electromagnetic interference between the two Ethernet ports as well.
Make sure the connections at the Ethernet ports line up. Pins 1, 2, 3, and 6 need to line up exactly or you may have connectivity issues. Use a CAT5 cable to get the best results.
You cannot connect more than two 10/100 Mbps hubs together. To connect the hubs together make sure you use the uplink connector. If there is no uplink port then you need to use a crossed over network cable.
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