Before the 21 century that supply of Internet is not expanded
like today, energy consumption of network devices were not in
interest because Internet diffusion rates of Internet all over the
world and computer were insignificant. But, one of the most
challenging issues of this century is high consumption of energy, so efforts to produce and save the energy are constantly being continued.
In global information-oriented society like today, we are using
Internet in entire field of our life, for example, creating new
knowledge and information using IT. Also, IT medias are placed whenever and wherever so that it can always be used. Most of the devices associated with computer and network communicate each other, and connected to Internet to exchange information and share it.
With the expansion of Internet supply, multimedia traffic on
network is increasing constantly. For this reason the installation of computer network devices are increasing, and power consumption is increasing greatly because of network equipment''s high speed, and these lead to the research about energy-efficient protocol of access network.
Ethernet is a world-wide deployed networking technology, and
this is a wire communication technology used greatly at LAN.
According to the trend to improve energy-efficiency on Ethernet, working group of IEEE 802.3az proceeded the standardization work on EEE. And they adopted a standard proposal based on LPI mode in september 2010, and confirmed the standard with details of physical layer to support this. But this doesn''t stated when and how to determine to control LPI mode, and the details of LPI client layer, so research on optimal mechanism of this field is being done actively.
LPI mechanism is active when transmitting data, and it becomes sleep mode when not transmission data so that it makes most of the components to be in inactive mode and consequently, minimize the power consumption. And it becomes in active mode again and transmit packet when new packet arrives. So, considering that the utility of link is low in access network''s characteristics and the devices are mostly activating when in low-power mode, great deal of energy save can be happen.
In this thesis, we introduced researches analyzed the problems on energy control mechanism of Ethernet switch associated with IEEE 802.3az that is adopted as a standardization proposal based on LPI, and proposed new mechanism and had experiments and analyzed it to solve that problems, and simulated to experiment the mechanism recommended is yielding data correctly, and consequently proved that improved mechanism is suitable for use
energy-efficiency.
Enhanced Synchronizing Packet Coalescing mechanism measures the inflow of traffic amount during certain period, and predicts traffic characteristic of next cycle. In this way it could improve energy efficiency by controlling optimal threshold value to relevant traffic load. Although it slightly increase the average packet delay comparing to original method, it declines power consumption greatly, so it was analyzed to improve the performance, overall.
And in Adaptive Synchronizing LPI Control Mechanism, it
measures incoming traffic load at a certain period, and it
determines on/off cycles based on this, and it transmits this to
xswitch, so that it can perform data transmission between switch and motivational mechanism. In this way switch performs LPI mode adapted to traffic load, improving the problem of original mechanism. And it also declines the energy consumption significantly while keeping average packet delay compared to original method, so it is analyzed to improve the performance overally.
Green network field is a worthwhile research field because it is
very useful considering in industrial perspective as well as the
environment problems caused by increase of greenhouse emission and energy shortage caused by resource depletion. If we develop and improve the mechanism researched in this thesis, the application of Ethernet switch and network interface card will be possible, and through this, it can contribute to energy efficiency of access network.