active and passive network devices 1

[y2k1981]

what's the difference between active network devices and passive network devices, I've never heard of either of these terms before, I've just seen it on a job spec. Can somebody explain?

 

[jahistx]

Hi y2k1981

An active network device (such as a network hub) requires its own power and will amplify and clean network signals before repeating them to all ports on the hub, whereas a passive device is usually unpowered and only creates a physical connection to allow communication between network hosts.

An active device increases the total available network segment distance through signal amplification. Devices using Cat-5 UTP cable are active hubs (in fact most hubs are active hubs).

Although an active hub repeats the signal to all ports, only one host is 'listening' for the signal.

Hope that is helpful.

'There's no such thing as an expert, just people that have learned from more mistakes.'

 

[y2k1981]

Thanks for the explanation john. One further question, would a repeat be considered active or passive? It doesn't require it's own power (or does it?) but it does "boost" the signal. So I guess the best example of a passive "device" is the cabling itself? Or is cabling considered a "device"?

 

[jahistx]

Hi y2k

Follow this link to read a more detailed explanation of network devices;

tech.clayton.edu/becsi/chap02.ppt

'There's no such thing as an expert, just people that have learned from more mistakes.'

 

[y2k1981]

thanks for the great link John. much appreciated