Chapter 7 : Fundamentals of Data Communications (Page Twelve)

Port Security
Port security is essential in order to deny unauthorized remote access. Passive devices will report on unauthorized access, usage anomalies, etc. Active devices, which are preferable, will act to deny access to unauthorized users and to disable ports in the event that user-definable parameters are exceeded.
Transmission Security
Transmission Security is critical to ensure that unauthorized [...]

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Chapter 7 : Fundamentals of Data Communications (Page Eleven)

Open Systems Interconnection (OSI) Model
The OSI Reference Model is a layered architecture (Figure 7.10) consisting of a set of international networking standards known collectively as X.200. Developed by the International Standards Organization (ISO), the basic process began in 1977 and was completed in 1983. The OSI model defines a set of common rules that can [...]

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Chapter 7 : Fundamentals of Data Communications (Page Ten)

High-Level Data Link Control (HDLC)
HDLC was developed by the International Standards Organization (ISO) as a superset of IBM’s SDLC and the United States National Bureau of Standard’s (NBS) ADCCP protocols. A version of HDLC is the Link Access Protocol-Balanced (LAP-B), which is used in ITU-TS X.25 packet switched networks. While HDLC was built on SDLC [...]

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Chapter 7 : Fundamentals of Data Communications (Page Nine)

Asynchronous Data Link Control (DLC) Protocols
Asynchronous protocols are used primarily for low-speed data communications between PCs and very small computers. Framing occurs at the byte level, with each byte surrounded by a start bit (a 0 bit) and a stop bit (a 1 bit). A parity bit often accompanies each character, as well. Telex transmission [...]

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Chapter 7 : Fundamentals of Data Communications (Page Eight)

Parity Checking
Parity checking is by far the most commonly used method for error detection and correction, as it is used in asynchronous devices such as PCs. Parity involves the transmitting terminal’s appending one or more parity bits to the data set in order to create odd parity or even parity. In other words, an odd [...]

Tags: asynchronous devices, computer communications environments, Cyclic Redundancy Checking, Error Correction, Euclidean algorithm, Forward, Samuel Morse

Penemu Blue Energy Ditemukan

Teka-teki hilangnya penemu “Blue Energy”, Djoko Suprapto, asal Nganjuk, Jawa Timur, mulai terkuak. Dalam surat yang dikirim melalui orang dekatnya, Djoko Suprapto menyatakan dirinya berada di rumahnya di Desa Ngadiboyo, Kecamatan Rejoso, Nganjuk. Lewat sepucuk surat itu pula, Djoko sekaligus menepis isu bahwa dirinya diculik.
Warga Nganjuk ini dikabarkan menghilang terkait penemuannya yang tergolong visioner. Dengan [...]

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Tentang Blue Energy: Berbahan Dasar Air, Dipamerkan dalam Konferensi Perserikatan Bangsa-Bangsa (UNO)

Tak banyak yang tahu, penemu bahan bakar blue energy yang sedang dikampanyekan Presiden Soesilo Bambang Yudhoyono (SBY) ternyata berasal dari Nganjuk. Dia adalah Joko Suprapto, warga Desa Ngadiboyo, Kecamatan Rejoso.
Kemarin, tim uji coba kendaraan berbahan bakar tersebut mengunjunginya. Mereka dipimpin staf khusus Presiden SBY, Heru Lelono. Rombongan itu dalam perjalanan dari Cikeas, Bogor menuju Nusa [...]

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