Pengertian Frame Relay

Pengertian

Frame Relay adalah protokol WAN yang beroperasi pada layer pertama dan kedua dari model OSI, dan dapat diimplementasikan pada beberapa jenis interface jaringan. Frame relay adalah teknologi komunikasi berkecepatan tinggi yang telah digunakan pada ribuan jaringan di seluruh dunia untuk menghubungkan LAN, SNA, Internet dan bahkan aplikasi suara/voice.

Frame relay adalah cara mengirimkan informasi melalui wide area network (WAN) yang membagi informasi menjadi frame atau paket. Masing-masing frame mempunyai alamat yang digunakan oleh jaringan untuk menentukan tujuan. Frame-frame akan melewati switch dalam jaringan frame relay dan dikirimkan melalui virtual circuit sampai tujuan.

Contoh Surat Lamaran Kerja

Jl.  Raya bekasi 01
Bekasi
Bekasi Barat 17133

Phone : 021 - 88852859

August 17th, 2009

Attention To:
Mr. Joko
PT. Damai Indonesia
Jl. Sudirman
jakarta

Dear Mr. Joko,

I am a graduate student in Computer Science at Indonesia University, and I will be awarded an M.S. degree in July 2007. I am currently looking for a position related to Database/Graphics Package Design in the research and development department of a major company.

Before coming to Indonesia University, I designed, supervised, and completed a CAD system. The function covers vector, character and curve generation, windowing, shading, and transformations.

At Indonesia University, my research work involves Compilation of Relational Queries into Network DML. To enhance my background, I have taken some courses in computer graphics and database, and I have experience in and an understanding of the design of databases. With this b background, I certainly believe that I am competent to meet challenging tasks and can make a good contribution to your company.

Enclosed is my resume, which indicates in some detail my training and experience. I sincerely hope that my qualifications are of interest to you and that an interview might be arranged at your convenience.

Thank you for your consideration. I look forward to hearing from you soon.

Sincerely yours,



Lampard

Pronouns

Definition
Generally (but not always) pronouns stand for (pro + noun) or refer to a noun, an individual or individuals or thing or things (the pronoun's antecedent) whose identity is made clear earlier in the text. For instance, we are bewildered by writers who claim something like

    * They say that eating beef is bad for you.

They is a pronoun referring to someone, but who are they? Cows? whom do they represent? Sloppy use of pronouns is unfair.
Not all pronouns will refer to an antecedent, however.

    * Everyone here earns over a thousand dollars a day.

The word "everyone" has no antecedent.
The problem of agreement between a pronoun and its antecedent and between a pronoun and its verb is treated in another section on Pronoun-Antecedent Consistency. The quizzes on pronoun usage are also listed at the end of that section.
This section will list and briefly describe the several kinds of pronouns.

Simple Present and Present Progressive

Simple Present

FORM

[VERB] + s/es in third person

Examples:

• You speak English.
• Do you speak English?
• You do not speak English.

Complete List of Simple Present Forms 

USE 1 Repeated Actions

Use the Simple Present to express the idea that an action is repeated or usual. The action can be a habit, a hobby, a daily event, a scheduled event or something that often happens. It can also be something a person often forgets or usually does not do.

Examples:

• I play tennis.
• She does not play tennis.
• Does he play tennis?
• The train leaves every morning at 8 AM.
• The train does not leave at 9 AM.
• When does the train usually leave?
• She always forgets her purse.
• He never forgets his wallet.
• Every twelve months, the Earth circles the Sun.
• Does the Sun circle the Earth?

Articles and Determiners

Articles and Determiners

Part 1

English sometimes uses "articles" - the (the definite article) and a/an (the indefinite articles) - before nouns. Many languages (Asian and Eastern European, for example) do not use equivalent words, thus causing many problems for learners of English. If you use articles incorrectly, or don't use them at all, your tutors will probably understand your writing, but many will find the misuse extremely irritating, which in some cases could affect your mark. It is important, therefore, that you make an effort to use articles correctly.

The biggest problem is probably when students don't write an article when they need to. Here's a simplified guide which should cover most of these cases.

TDM, FDM, CDM

MULTIPLEXING

Pembagian suatu saluran komunikasi untuk dipakai secara bersama diistilahkan
sebagai multiplexing
Keuntungannya :

* Komputer host hanya butuh satu port I/O untuk banyak terminal
* Hanya satu line transmisi yang dibutuhkan


Tiga teknik multiplexing

· Frequency-Division Multiplexing (FDM), paling umum dipakai untuk radio
atau TV

· Time-Division Multiplexing (TDM) atau synchronous TDM, dipakai untuk
multiplexing digital voice dan banyak digunakan untuk menggabungkan
aliran suara digital dan aliran data
· Peningkatan efisiensi Synchronous TDM dengan variasi sebagai berikut :
· Statistical TDM atau
· Asynchronous TDM atau

· Intelligent TDM

Bertujuan memperbaiki efisiensi synchronous TDM dengan cara menambahkan
rangkaian yang lebih kompleks di sisi multiplexer

KEAMANAN SYSTEM dan JARINGAN KOMPUTER

KEAMANAN SYSTEM dan JARINGAN KOMPUTER
Perkembangan teknologi informasi, Internet seringkali disebut sebagai dunia tanpa batas. Beragam informasi bisa didapat di internet tak hanya memberikan kontribusi positif bagi kehidupan tetapi juga memberikan ancaman lebih menakutkan dari dunia maya atau Sekalipun sesuatu berasal dari sumber yang terpercaya dan aman untuk dijalankan. Maka ntuk itu, komputer membutuhkan suatu benteng yang mampu melindungi komputer dari ancaman berbahaya di internet. Keamanan komputer maupun jaringan komputer, terutama yang terhubung ke internetharus direncanakan dan dikoordinasikan dengan baik agar dapat melindungi sumber daya yang ada agar dapat mengoptimalisasikan keamanan system pada jaringan sehingga dapat mengurangi ancaman yang terdapat di dalam dunia internet dan kita menjadi merasa lebih nyaman menjelajahi dunia internet

Klafisifikasi Keamanan Sistem Informasi menurut David Icove ada 4 macam yaitu:

1. Fisik ( Physycal Security)
2. Manusia ( Personal Security)
3. Data, media dan teknik komunikasi
4. Kebijakan dan prosedur

Berdasarkan Elemen System Terdapat 3 bagian Keamanan

1. Network security
difokuskan pada saluran (media) pembawa informasi atau jalur yang dilalui.

2. Application security
difokuskan pada aplikasinya sistem tersebut, termasuk database dan servicesnya.

3. Computer security
difokuskan pada keamanan dari komputer pengguna (end system) yang digunakan untuk mengakses aplikasi,termasuk operating system (OS)