Wireless Networking Technology: From Principles to by Stephen A. Rackley

By Stephen A. Rackley

Because the call for for greater bandwidth has result in the advance of more and more complicated instant applied sciences, an realizing of either instant networking applied sciences and radio frequency (RF) ideas is vital for enforcing excessive functionality and value powerful instant networks.

Wireless Networking Technology in actual fact explains the most recent instant applied sciences, protecting all scales of instant networking from own (PAN) via neighborhood zone (LAN) to metropolitan (MAN). construction on a complete evaluation of the underlying applied sciences, this sensible consultant includes ‘how to’ implementation info, together with a case learn that appears on the particular standards for a voice over instant LAN program. This important source will supply engineers and bosses the entire important wisdom to layout, enforce and function excessive functionality instant networks.

· discover intimately instant networking applied sciences and comprehend the options in the back of RF propagation.
· achieve the data and abilities required to put in, use and troubleshoot instant networks.
· how you can handle the issues all for imposing a instant community, together with the influence of sign propagation on working diversity, gear inter-operability difficulties and plenty of more.
· Maximise the potency and defense of your instant community.

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Additional resources for Wireless Networking Technology: From Principles to Successful Implementation

Example text

This is a similar mechanism to the back-off in CSMA/CD, except that here it is designed to avoid collisions between stations that are waiting for the end of another station’s transmitted frame rather than being a mechanism to recover after a detected collision. 11 MAC Layer, p. 11 MAC is discussed in more detail, and variations on CSMA/CA used in other types of wireless network will be described as they are encountered. Physical Layer Technologies When the MPDU is passed down to the PHY layer, it is processed by the PHY Layer Convergence Procedure (PLCP) and receives a preamble and header, which depend on the specific type of PHY layer in use.

5 committee. 96 µs. A 125 MHz clock speed is required to deliver a 100 Mbps effective data rate because of the 4B/5B encoding described below. 5 MHz, 125 MHz and above. 4B/5B encoding is the first step in the encoding scheme (Figure 2-7). Each 4-bit nibble of input data has a 5th bit added to ensure there are sufficient transitions in the transmitted bit stream to allow the receiver to synchronise for reliable decoding. In the second step an 11-bit Feedback Shift Register (FSR) produces a repeating pseudo-random bit pattern which is XOR’d with the 4B/5B output data stream.

PHY layer technologies determine the maximum data rate that a network can achieve, since this layer defines the way the data stream is coded onto the physical transmission medium. However, the MAC and PLCP headers, preambles and error checks, together with the idle periods associated with collision avoidance or backoff, mean that the PMD layer actually transmits many more bits than are passed down to the MAC SAP by the Data Link layer. The next sections look at some of the PHY layer technologies applied in wired networks and briefly introduces the key features of wireless PHY technologies.

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