|
|
This is only a preview of the paper
Click here to register and get the full text.
Existing members click here to login
|
|
|
Ethernet vs. Token Ring by Ting Kwan HUNG -------------------------------------------------------------------------------- Contents [What are Ethernet and Token Ring] [Ethernet] [Forms of Ethernet] [Token ring] [Comparing Ethernet and Token Ring ] [Links of Interest] -------------------------------------------------------------------------------- What are Ethernet and Token Ring ? The use of microcomputers and workstations and the need for these computer systems to communicate lead to the evolvement of local area network, (LAN). On a LAN there are multiple devices and they are able to communicate directly with each other. In order to communicate they have to "share" acess to a physical medium. There are several methods that control this sharing. The methods are the medium access control (MAC) sublayer of the Data Link layer in the Open System Interconnection (OSI) model specified by join technical committee formed by International Electrotechnical Commission (IEC) and International Organization for Standardization (ISO). Ethernet is a random medium control while Token Ring is a distributed medium access control. History of Ethernet Ethernet was first developed by Xerox , Intel and Digital Equipment in the 1970s. The evolvement of ethernet included various ways. The IEEE (Institue of Electrical and Electronic Engineers) devoted the IEEE 802.3 as the full Ethernet standard. -------------------------------------------------------------------------------- CSMA/CD (carrier sense multiple access with collision detection) This method allows only one of the devices on the LAN cabling to transmit at any given time. When any of the devices want to transmit, it must first "listen" to the medium and to determine whether there is any data being transmitted at that time. It will continue to monitor the medium until it is free. When the network is clear it will go ahead with the transmission. Data is transmitted in "packet", which may vary in size from 64 bytes to 1500 bytes. If a larger document is needed to be sent, it has to be broken down into packets and each of them is sent separately until the whole document is transmitted and reasssembled by the receiving device. -------------------------------------------------------------------------------- Forms of Ethernet The standards for the original Ethernet are 10Mbps and a bus-based 50 ohm coaxial cable. After Ethernet was standardized by the IEEE 802.3 committee, five more alternative "Ethernets" appeared: 10BASE-5 10BASE-2 1BASE-5 10BASE-T 10BROAD36 The names of these CSMA/CD networks denote the followings:- speed in Mbps / type of signaling (BASE for baseband and BROAD for Broadband) / maximum segment length For example: 1BASE-5 means a 1Mbps baseband LAN with a maximum segment length of 500 meters.
Approximate Word count = 1496
Approximate Pages = 6
(250 words per page double spaced)
|
|
|
|
|
|