Technical Support--FAQ


100Mbps Repeater HUBs -- FastHUB-4A / FastHUB-8A / FastHUB-16A
Q.	Computer X cannot connect to Computer Y.
A.	1. Verify the network cable first. - The cable length is 100 meters max. (Cat.5) - Try another good cable. 2. Verify the connection port of the Hub. - Try another port of the Hub. < Case [ A ] > - If straight-through cables (not crossover cables) are used, please use the MDI-X ports of Hub. The MDI (Uplink) port is for Hub-to-Hub connection. - If the last MDI-X port (Port 4 of FastHUB-4A, Port 8 of FastHUB-8A) is used, do not use the MDI (Uplink) port at the same time because they share the same components of the hub. - Because the MDI/MDI-X function of Port 16 of FastHUB-16A is switched by a push button, please switch that button to check if it is at the right function. < Case [ B ] > - Computer-to-Hub connection please use MDI-X ports. Hub-to-Hub/Switch connection can be done from the MDI (Uplink) port to the MDI-X port of another hub with straight-through cables. - If the MDI (Uplink) port is used, do not use the last MDI-X port (Port 4 of FastHUB-4A, Port 8 of FastHUB-8A) at the same time because they share the same components of the hub. 3. Class II Limitation of 100Mbps Hub - Cascading 100Mbps Hubs together, maximum 2 units is allowed. - The total cable length between any two network devices on the 100Mbps Hubs is 205 meters maximum, I.e. A+B+C < 205 meters. 4. Verify the function of the computer. - Try the connection on another computer that is no problem. - Verify the network adapter (10/100Mbps Ethernet Adapter) and network configuration of the computer. 5. Verify the Hub function. - Check the power input of the hub by the Power LED. If fail, try another power adapter. - Try another Hub. [Notes:] You can diagnosis the network problem with the LED of the Hub. 1. Power : Indicates the power input of the Hub. 2. Link : Indicates a valid network connection. 3. Act : Indicates network traffic on the port. On some models, Link and Act uses the same indicators. ¡§ON¡¨ means Link and ¡§Flashing¡¨ means Act. 4. Partition : Indicates some error happening on that connection and that connection has been partitioned from the hub. That can prevent the problem to interfere other connections. If the problem disappears, the partition of that port will OFF.