Coaxial Architectures

The original definition of the 802.3 model included a bus topology using a baseband coaxial cable. From this model came the first Ethernet architecture. Ethernet was originally codeveloped by Digital, Intel, and Xerox and was known as DJX Ethernet. 

A special type of network architecture that deserves mention is the Attached Resource Computer Network (ARCNet). Developed in 1977, it was not based on any existing IEEE 802 model. However, ARCNet is important to mention because of its ties to IBM mainframe networks and also because of its popularity. Its popularity comes from its flexibility and price. It is flexible because its cabling uses large trunks and physical star configurations, so if a cable comes loose or is disconnected, the network will not fail. Additionally, since it used cheap, coaxial cable, networks could be installed fairly cheaply. 

D.The names of each of these tells you exactly what they are. In the case of Ethernet 10Base2, the Ethernet part states that it is of Ethernet architecture, the 10 means that it can transmit up to 10Mbps, Base signifies baseband transmission, and the 2 is the distance and, in this case, equates to the 185-meter limitation of coaxial Thinnet cable. 

Viry, L., Moulton, S.E., Romeo, T., Suhr, C., Mawad, D., Cook, M., and Wallace, G.G. (2012) Emulsion-coaxial electrospinning designing novel architectures for sustained release of highly soluble low molecular weight drugs. J. Mater. Chem., 22, 11347-11353. 

To use the OSI model, a network analyst lists the known protocols for each computing device or network node in the proper layer of its own seven-layer OSI model. The collection of these known protocols in their proper layers in known as the protocol stack of the network node. For example, the physical media employed, such as unshielded twisted pair, coaxial cable, or fiber optic cable, would be entered as a layer 1 protocol, whereas ethemet or token ring network architectures might be entered as a layer 2 protocol. Other examples of possible protocols in respective layers wiU be explored in the remainder of this section. 

The choice of a particular network architecture will have a definite bearing on the choice of network adapter cards and less of an impact on the choice of media or network operating system. For instance, an ethernet network architecture requires ethernet adapter cards. As will soon be seen, it is the adapter card which holds the key, or media access control (MAC) layer protocol, which determines whether a network is ethernet, token ring, fiber distributed data interface (FDDI) or any other network architecture. Ethernet runs over thick or thin coaxial cable, shielded or unshielded twisted pair, fiber or wireless—clearly a wide choice of media options. 

Very elegant approach was demonstrated recently when zinc -tetra(4-pyridyl) porphyrin molecules were assembled together with fullerene derivatives into hydrid nanorods. These nanorods demonstrate coaxial cable architecture with the central fullerene-composed n-type wire surrounded by the p-type porphyrin cladding (Figure 33). ... 

GMSL uses CML as its physical layer. It supports both two-wire STP and coaxial cable as well as the distribution of power over the signal wires. The GMSL architecture includes an embedded control channel. 

A different example of miniaturized OLEDs, excellently integrated with nanofiber fabrication technologies and geometries, does not rely on conventional, planar architectures. These devices are realized via coaxial electro spinning... 

Each of these methods overcome the difficulties of aperture-based systems and produce electrospun fibers at a much greater rate due to the formation of multiple Taylor cones simultaneously. Thus, such systems are more amenable to scale-up for membrane fabrication. However, the lack of an aperture reduces control over the process, for example, twin-lumen or coaxial needles that can produce core-sheath fibers cannot be implemented in a bowl electrospinning setup, and the flow rate of electrospinning solution can be harder to accurately control, making the formation of more advanced fiber architectures such as beaded structures or electrosprayed micro or nanospheres difficult. 

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