A question about MAN,DQDB and SMDS

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DQDB (Distributed Queue Dual Bus) operates by allowing multiple users to access a shared communication medium, facilitating efficient data transmission in metropolitan area networks (MAN). It utilizes a dual bus architecture where data packets are queued and transmitted in a round-robin fashion, minimizing delays. SMDS (Switched Multimegabit Data Services) provides high-speed data transmission over public networks, enabling organizations to connect their local networks to a MAN. While information on SMDS specifically for MAN is scarce, it is primarily known for its application in wide area networks (WAN). Further research into telecommunications resources may yield more insights into these technologies.
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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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Have you tried google yet?
 
ya,i have tried,i cannot found how SMDS is used for MAN,just can be found used for WAN.
 

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