A question about MAN,DQDB and SMDS

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In summary, DQDB is a LAN technology that uses a dual bus access method, while SMDS is a WAN technology that uses packet switching for high-speed data transmission over large distances and can also be used to connect multiple LANs together in a MAN.
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kidd
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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.

I post it also at electronic engineering,but i dun know where i should post at,sorry...i think i should post at there.
 
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Distributed Queue Dual Bus (DQDB) is a local area network (LAN) technology, developed by the Institute of Electrical and Electronics Engineers (IEEE). It is based on an access method known as a “dual bus”. In this type of network, all stations are connected to two separate physical buses, which are also connected to each other. Each station is assigned an address, and when a station wants to send data, it sends out a request onto the bus, which is then seen by all other stations. If this request is addressed to a particular station, that station will respond with an acknowledgement, and the sending station can then start sending its data. If multiple stations try to send data at the same time, the dual bus system will queue the requests in the order they were received, allowing for fair access between all stations. Switched Multimegabit Data Services (SMDS) is a wide area network (WAN) technology, developed by Bellcore and standardized by the American National Standards Institute (ANSI). It is designed to provide high-speed data transmission over large distances, such as between cities or states. In order to achieve this, SMDS uses packet switching, in which data is broken up into small packets, each with a header containing addressing information. These packets are sent at the same time, along different routes, and reassembled at the destination. As well as providing high-speed data transmission over long distances, SMDS can also be used to connect a number of local area networks together, which is useful for connecting a MAN.
 
  • #3


I am happy to help you understand more about DQDB and SMDS in the context of a metropolitan area network (MAN).

Distributed queue dual bus (DQDB) is a network protocol used for MANs. It is based on the concept of a dual bus, where data is transmitted on two separate buses in opposite directions. This allows for simultaneous communication in both directions, increasing the efficiency of the network. DQDB uses a token passing mechanism to control access to the buses, ensuring that only one device can transmit data at a time. This helps to prevent collisions and maintain the integrity of the data being transmitted.

Switched multimegabit data services (SMDS) is another network protocol commonly used in MANs. It is a high-speed, packet-switched technology that allows for the transmission of data at speeds up to 45 Mbps. SMDS works by breaking data into smaller packets and sending them through the network using the most efficient route. This allows for faster data transmission and better network performance.

In a MAN, DQDB and SMDS can be used together to provide a reliable and efficient network infrastructure. DQDB can be used for local communication within a specific area, while SMDS can be used for long-distance communication between different areas of the city. This allows for seamless connectivity and data transmission across the entire MAN.

In terms of data transmission, DQDB and SMDS both use a form of packet switching, where data is broken into smaller packets and sent through the network. However, DQDB uses a token passing mechanism to control access to the network, while SMDS uses a routing algorithm to determine the most efficient path for data transmission.

In conclusion, DQDB and SMDS are both important components in a MAN, providing efficient and reliable data transmission. I recommend researching more about their specific protocols and mechanisms to gain a deeper understanding of their role in a MAN. Additionally, there are numerous resources available online, such as technical articles and white papers, that can provide more information on DQDB and SMDS in the context of MANs. I hope this helps answer your question.
 

FAQ: A question about MAN,DQDB and SMDS

What is MAN?

MAN stands for Metropolitan Area Network. It is a network that connects multiple LANs within a specific geographical area, typically a city or a large campus.

What is DQDB?

DQDB stands for Distributed Queue Dual Bus. It is a network architecture that allows multiple nodes to access a shared medium, such as a network cable, to transmit data.

What is SMDS?

SMDS stands for Switched Multimegabit Data Service. It is a wide area network technology that allows for high-speed data transmission over long distances.

What are the main differences between MAN, DQDB, and SMDS?

MAN is a type of network that covers a smaller geographical area compared to SMDS, which can cover larger distances. DQDB is a network architecture that allows for shared access to a medium, while SMDS uses a switching technology. Additionally, MAN and DQDB are typically used for local data transmission, while SMDS is used for long-distance data transmission.

What are some common applications of MAN, DQDB, and SMDS?

MAN is commonly used by businesses, universities, and government agencies to connect multiple LANs within a city or campus. DQDB is often used for data transmission in metropolitan areas, while SMDS is used for long-distance data transmission for applications such as video conferencing, file sharing, and online transactions.

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