A question about MAN,DQDB and SMDS

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DQDB (Distributed Queue Dual Bus) is a network protocol that facilitates data transmission by using two buses to manage data packets in a distributed manner, ensuring fair access and reducing collisions. SMDS (Switched Multimegabit Data Services) provides high-speed data transmission over a metropolitan area network by utilizing packet-switching technology, allowing for efficient data transfer between multiple locations. Both DQDB and SMDS are essential for organizations looking to implement effective communication solutions within a city. Resources for further research on these topics are limited, but exploring telecommunications and networking websites may yield useful information. Understanding these technologies is crucial for leveraging metropolitan area networks effectively.
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This is a question from my lecturer,i really cannot answer it because i dun understand about DQDB and SMDS,so wish anyone expert can tell me about it or give me some information for it.It is not much website can be found the information.If u know some website about this,please let me know,i will research it.Thank you all...

The question is:

A metropolitan areal network(MAN) is a network designed to extend over an entire city.Most organizations find that even if they could get permits to lay cables on public land,a better alternative is to use the services of existing utilities,such as Telephone Company.These services include:distributed queue dual bus(DQDB) and switched multimegabit data services(SMDS).Explain how the data transmission in DQDB is done and how SMDS is used for MAN.

Thanks a lot for help me.
 
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