You will soon find the computers are able to communicate with the devices left on the network. You have now found the problem device. By making the network shorter, you are isolating the source f the problem. If you exceed the cable s limit without repeaters, you will run into problems. Always check the cable length and number of devices on the network.
Attenuation is the degradation of signal over distance.
To avoid this keep within the limits. Once you have isolated the problem, you can check whether the BNC connector is securely fastened and the NIC is not faulty. It is very important that you do not run your network cables near other cables, behind television sets or radios. The Electromagnetic signals will interfere with the communication between devices. EMI as it s called can cause the loss or corruption of data.