I. Marsic's Computer Networks - Performance and QOS PDF

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If it encounters a special control sequence, say preamble (call it PRE), then it “stuffs” (adds) a control escape sequence ESC into the transmitted data stream, before PRE (resulting in ESC PRE), to indicate that the following PRE is not a preamble but is, in fact, actual data. Similarly, if the control escape pattern ESC itself appears as actual data, it too must be preceeded by an ESC. The method receiveBits() removes any control escape patterns that it finds in the received packet before delivering it to the upper-layer method handle() (Figure 1-14).

The method receiveBits() removes any control escape patterns that it finds in the received packet before delivering it to the upper-layer method handle() (Figure 1-14). The pseudo code in Listing 1-1 is only meant to illustrate how one would write a protocol module. It is extremely simplified and certainly not optimized for performance. My main goal is to give the reader an idea about the issues involved in protocol design. 1. Chapter 1 • Introduction to Computer Networking 21 When Is a "Little in the Middle" OK?

Another important parameter is the round-trip time (or RTT), which is the time a bit of information takes from departing until arriving back at the sender if it is immediately bounced back at the receiver. This time on a single transmission link is often assumed to equal RTT = Ivan Marsic • 28 Rutgers University Sender Receiver Transport layer Send data Receive ACK Network layer Send ACK Link+Phys layer Receive data Network layer Processing delay within network layers Receive packet Send packet Transport layer Processing delay within transport layers Receive packet Send packet Processing and transmission delays within link/physical layers Link+Phys layer Propagation delay (receiver → sender) Propagation delay (sender → receiver) Figure 1-18: Delay components that contribute to round-trip time (RTT).

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Computer Networks - Performance and QOS by I. Marsic


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