Baseband vs. broadband signalling

I am currently in my second year at university and am experiencing difficulty in finding suitable sites to answer the following question: "Sychronous systems use either baseband or broadband signalling. Explain each and contrast the differences." Any help or appropriate links to sites would be appreciated.

Here is a list that highlights the main differences between baseband and broadband signalling.

BASEBAND

• Uses digital signalling
• Bi-directional transmission
• No frequency-division multiplexing Signal travels over short distances - (attenuation becomes evident after 1 km of medium, after which repeaters can be used to retransmit the signal)
• Used primarily on bus
• Uses Manchester or differential Manchester encoding

  BROADBAND

• Uses analog signalling
• Unidirectional transmission
• Frequency-division multiplexing is possible - Separate channels can support separate and independent data traffic)
• Signal can travel over long distances before being attenuated
• Good for both bus and tree topologies
• No digital encoding

  Here's a few links we found on the subject:  http://sunsite.queensu.ca/rmc/network/lanproject/lansample/network_implementation.htm  http://www.scottsnetworkclass.com/basic/basicprt.html