Discussion Assignment Unit 3 CS 3303-01 Data Structures University of the People Majd Alhaddad Compare ATM (Asynchronous Transfer Mode) and ETHERNET on the following aspects: · Bandwidth · Scalability · Interoperability · Quality of Service ATM (Asynchronous Transfer Mode) : It is a switching and multiplexing technology that combines the advantages of circuit switching and packet switching. Circuit switching is the foundation of the traditional telephone network, a technology that provides guaranteed power and a stable transmission delay. On the other hand, packet switching technology provides flexibility and efficient use of total network bandwidth. Cell switch positions between these two and provide networks with low latency and high throughput ETHERNET It is the most popular LAN technology today. Approximately 80% of all LAN installations use ethernet Traditional Ethernet is a shared access technology, based on a broadcast medium in which all stations connected to an Ethernet network share a single communications medium, coaxial cable or twisted pair cable. The broadcast nature of Ethernet is very different from that of peer-to-peer ATM networks Bandwidth ATM Massive bandwidth at the time it was introduced. Speeds of up to 155 Mbps and 622 Mbps Limited bandwidth of 10 Mbps ETHERNET Note: The actual bandwidth of the payload is always smaller than the full transmission speed of the medium. This is because protocols reduce overall bandwidth, and there are usually several layers of protocols. Scalability ATM can be used as LAN/MAN/WAN technologies, thus using the same protocol over the entire network, Ethernet is purely a LAN technology
Interoperability Quality of Service References : Because we can use all network technologies and with the same protocol, ATM is highly compatible · CBR constant bit rate provides a constant and stable bit rate for real-time data. Similar to a line switched circuit. This is the simplest level of service. · Variable Bitrate, VBR, provides service for real-time and streaming data where the bitrate varies. This category has recently been divided into real-time and non-real-time. Unlimited Bitrate, UBR, does not guarantee any bit rate. Used for data that can tolerate delays, such as traditional computer data. This can be seen as an interpretation of the popular term "best effort service". · Available Bitrate, ABR, is a service for applications that can negotiate bitrate during transmission. The bit rate available in the network varies and applications have to adapt to different bit rates based on feedback from the network. Limited compatibility QoS for Ethernet. Existing implementations include policy servers, tag switching, smart queuing, and various IP based applications and tools but the problem with existing implementations is that they are not standards based for their own and their hardware will not work. Standards are clearly needed or Ethernet can end up in a mess of non- integrated proprietary networks. QoS is implemented in Ethernet via the standards 802.1q and 802.1p, proposed by IEEE. They both operate at layer 2. 802.1q is a standard for providing virtual LAN definition and quality of service levels. virtual local network IEEE 802.1