Computer Networks: An Open Source Approach (Connect, Learn, Succeed)
Format: PDF / Kindle (mobi) / ePub
Ying-Dar Lin, Ren-Hung Hwang, and Fred Baker’s Computer Networks: An Open Source Approach is the first text to implement an open source approach, discussing the network layers, their applications, and the implementation issues. The book features 56 open-source code examples to narrow the gap between domain knowledge and hands-on skills. Students learn by doing and are aided by the book's extensive pedagogy.
Lin/Hwang/Baker is designed for the first course in computer networks for computer science undergraduates or first year graduate students.
rate of which is roughly 51.8*x Mbps. Therefore, the line rate of OC-3 is roughly 155 Mbps, and that of OC-12 is roughly 622 Mbps, and so on. Highspeed SONET/SDH, such as OC-192 at roughly 10 Gbps, is usually deployed in the backbone. Due to the large infrastructure of SONET/SDH, it is difficult to replace it with Ethernet rapidly. This is why 10 Gigabit Ethernet supports the so-called WAN PHY, which can be directly connected to an OC-192 interface. Therefore, it is feasible to make 10 Gigabit
requirements of a data flow. It merges other data flows of digital streams, or digital signals such as the passband signals. Hence multiplexing could take place at different places. Multiplexing can create logical channels in frequency, time, code, or space by frequency-division multiplexing (FDM), time-division multiplexing (TDM), codedivision multiplexing (CDM), or space-division multiplexing (SDM). The schemes of multiplexing differ in how they divide a physical channel into multiple channels
optimized to adapt to the characteristics of any given medium. For example, in wireless communications, link adaptation, or adaptive coding and modulation (ACM), is the technique that matches the methods of coding and modulation and the parameters of communication protocols to the channel conditions. 2.1.4 Transmission Impairments Transmission media are not perfect. Signals received are not exactly the same as those transmitted. Several factors might impair the transmission reliability of the
2-bit patterns for four combinations. A combination represents a symbol. Hence, a symbol of 2N combinations can carry N-bit data at a time. QAM needs at least two amplitudes and two phases. Like QPSK, QAM uses two sinusoidal carriers that are out of phase by 90º. QAM employs two types of constellation diagrams: circular and rectangular. Figure 2.26 shows several circular constellation diagrams, where the diagram of 4-QAM is the same as that of QPSK. Figure 2.27 shows the rectangular constellation
The relaying functionality enhances the coverage of high data rates, group mobility, and temporary network deployment, and provides coverage in new areas. LTE-advanced also employs band aggregation of spectra in 20 MHz chunks to obtain the bandwidth for a logical channel. This can lead to a total of 100 MHz (5 chunks) transmission in each direction, downlink or uplink. The enhanced peak data rate of ITE-advanced that supports advanced services is 100 Mbps for high mobility, or 1 Gbps for low