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Kebeberadaan jaringan komputer merupakan hal mutlak dalam suatu perusahaan. Anak cabang perusahaan di berbagai daerah seharusnya dapat menjalin komunikasi dan menjaga keamanan data. Salah satu teknologi yang sedang berkembang adalah VPN berbasis IPSec. Sistem yang dibuat mensimulasikan bagaimana VPN tunnel berbasis IPSec dapat terkoneksi. Setelah itu dilakukan penghitungan dan analisa QoS terhadap routing OSPF, RIPv2 dan EIGRP. Simulasi dilakukan di EVE-NG dengan mengibaratkan sebuah perusahaan yang memiliki 1 kantor pusat dan 2 kantor cabang dengan server yang berada di data center. Simulasi dilakukan pada layanan VoIP dengan server asterisk. Dari hasil pengujian fungsional, sistem dapat berfungsi sesuai yang direncanakan. Uji performansi menunjukan packet loss untuk OSPF, RIPv2 dan EIGRP adalah 0.0 %. Dari hasil pengujian yang telah dilakukan semua parameter dalam batas kualitas standar ITU-T.

One of the technologies that has wireless application nowadays was 5G mobile communication.This paper presents the designing of a Tri-band microstrip antenna for targeting 5G broadband communications,This element antenna has 3x3 rectangular patches with feeding line structures are branched. With the use of double feeding proximity coupling structure, we intend to maximize antenna bandwidth, therefore the antenna cover range tri-band frequency from 40 GHz to 70 GHz. The reflection factor comparation between simulation and measurement has a minimum with respective frequency at 45.3 GHz, 57 GHz, and 66 GHz. The total measurement bandwith 11.5 Ghz. With this combination tecnique, the proposed antenna is a promising candidate for 5G communication systems.

Flood is still a problem that always been a mayor obstacle in several big cities in Indonesia such as DKI Jakarta. If the rainfall so high and river can be accommodate the rainfall, there will be flooding. So that river water doesn’t overflow, it is necessary to make a floodgate in the river flow. One of the previous studies that has been carried out regarding the control and monitoring of water dam gates is researched by Fahruddin. 2014 from the Faculty of Science and Technology, Makassar State Islamic University: Describes the design of a device capable of monitoring the height of water activity in the reservoir and controlling the floodgates automatically according to the height of water activity. The research that the writer is currently carrying out is the design method which consists of a series of sensors, NodeMCU microcontrollers, and Stepper Motors. The workflow of this system is when the water rises or falls, it send a signal to the sensor. And then the signal will be input for the microcontroller which is then processed to turn on the motor, so that it can open or close the floodgates, and send information to the indicator screen and Telegram application. After the experiment is carried out, it can be said that the system can work properly, namely when the ultrasonic sensor experiment, it was found that the sensor has been sent an output signal that was in accordance with the water level in actual condition. Based on testing using the fuzzy method, it was found that opening value at the floodgate obtained during the test had an average accuracy rate of 91% with an error difference of 9%.

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