Threaded Case Study


A   1 mbps DSL Modem
B   Linksys 7-Port Router w/ Print Server
C   D-Link 8-Port Switch

Extended Star Topology

Star topology where a central hub is connected by vertical cabling to other hubs that are dependent on it.

Attenuation - Loss of communication signal energy. EIA/TIA-568B specifies the maximum length of horizontal cabling for unshielded twisted pair cable is ninety meters. In addition, we learned that the maximum length for patch cords at the telecommunications outlet/connector is three meters. We also learned that the maximum length for patch cords/jumpers at the horizontal cross connect is 6 meters. Thus, the maximum distance for a run of horizontal cabling that extends from the hub to any workstation is 100 meters.

In a star topology because each of the horizontal cabling runs can radiate out from the hub much like the spokes of a wheel, this means a local area network using this type of topology could cover a 100-meter by 100-meter area.

When signals first leave a transmitting station, they are clean and easily recognizable. However, the longer the cable length, the weaker and more deteriorated the signals become as they pass along the networking media. If a signal travels beyond that distance, there is no guarantee that when it reaches a NIC card, the NIC card will be able to read it.

If a simple star topology cannot provide enough coverage for the area to be networked, the star topology can be extended by using internetworking devices that do not result in attenuation of the signal. When this occurs, the resulting topology is referred to as an extended star topology.