# MUXER--A New Equipment for Energy Saving in Ethernet
## 4 Results  
In this section, the paper makes a comparison about the power consumption in low-traffic condition between a normal LAN without MUXER (model 1) and another LAN within some MUXERs (model 2). Each model includes k routers, n switches and p end-terminals. The model 2 which contains MUXERs has q MUXERs (q \(\leq\) n) with k ingress ports in each MUXER, and each MUXERs controls some switches and end-terminals which connected to these switches in normal LAN. To visualize the result, this paper uses a network of a university campus with 10 buildings. Each building has several floors. In here, we assume the number of floor of the campus is 73 floors, and the average number of 8-port switch in each floor are 8 switches. It means this paper analyzes the power consumption of 584 switches. Each switch has four components which consume the powers: chassis, switching fabric, line-cards and ports. The chassis includes the cooling equipment, among other things, and its power consumption is denoted as P\({}_{\text{s-fixed}}\). The switching fabric is responsible for learning and maintaining the switching tables, and its power consumption is denoted as P\({}_{\text{fabric}}\). The line-cards maintain buffers for storing packets. Each switch has the finite buffer, and is denoted as K\({}_{\text{buffer}}\). The power consumption of line-cards are denoted by P\({}_{\text{line-card}}\). Every port also consumes the power, each of them is denoted by P\({}_{\text{port}}\). We uses the values for P\({}_{\text{s-fixed}}\), P\({}_{\text{fabric}}\), P\({}_{\text{line-card}}\), and P\({}_{\text{port}}\) from Cisco Power Calculator [18], and assume that the power consumed by this switch is indicative and typical of similar product (Table 2). We experimented the power consumption rate with the switch and Router from different manufacturer for deciding our load model. Dasan (V2624G-PoEK, DASAN Networks, Inc., Seongnam-si, Gyeonggi-do, Korea) (56 Gbps/30 W) switch was tested with Wattman power meter (HPM-300A, AD POWER Co., Ltd., Bucheon-si, Gyeonggi-do, Korea) and Yokogawa WT210 (760401 model, Yokogawa Co., Ltd., Japan) measurement equipment, result is in Figure 11a. Cisco (WS-C3560G-24 TS-S, Cisco Systems, Inc., San Jose, CA, USA) (32 Gbps/74 W) switch was tested with Yokogawa WT210 (760401 model, Yokogawa Co., Ltd., Tokyo, Japan) equipment and result given in Figure 11b. In both cases User Datagram Protocol (UDP) packets were collected for this experiment. CISCO 7609 router (OSR-7609, Cisco Systems, Inc., San Jose, CA, USA) (720 Gbps) with got 1 router processor, 1 switch fabric, 1 power supply and 2 line cards was used and tested with HPM-300A device (HPM-300A, AD POWER Co., Ltd., Bucheon-si, Gyeonggi-do, Korea) and result given in Figure 11c. In this router, Agilent Technologies N2X (Agilent N2X, Agilent Technologies, Inc., Santa Clara, CA, USA), IxN2X 7.40 GA Release with static routing protocol was used. Detail result of this router's power consumption are given in Figure 11c. A portion of the complete result is stated here and we also collected data with other devices and packet type. At the same time, we experimented removing line card, all those data leading us that power consumption of tested equipment are linear. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Parameter** & **Value (100\%)** & **Value (30\%)** & **Description** \\ \hline Ps-fixed & 60 W & 18 W & Power consumption of chassis of a switch \\ \hline Pfabric & 315 W & 94.5 W & Power consumption of switching fabric of switch \\ \hline Pline-card & 49 W & 14.7 W & Power consumption of line-cards of switch \\ \hline Pport & 3 W & 0.9 W & \\ Pport-idle & 0.1 W & 0.03 W & \\ Pport-transition & 2 W & 0.6 W & Power consumption of different states of ports \\ P\({}_{\text{port-transition}}\) (port-transition—Time) & 1 ms to 10 ms & 1 ms to 10 ms & \\ \hline Pic-chip & 100 W & 30 W & Power consumption of IC Chip of MUXER \\ \hline Pm-fixed & 30 W & 9 W & Power consumption of Ports of a MUXER \\ \hline \hline \end{tabular}
\end{table}