Download PDF by Jozsef Kurschak, Elvira Rapaport: Hungarian olympiad problem book 2

By Jozsef Kurschak, Elvira Rapaport

ISBN-10: 0883856123

ISBN-13: 9780883856123

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Extra resources for Hungarian olympiad problem book 2

Example text

This yields an overall bit rate of 64 Kbps for each channel (eight bits per sampleր8,000 samples per second). The multiplexer gathers one eight-bit sample from each of the 24 channels, and aggregates them into a 192-bit frame. To the frame, it adds a frame bit, which expands the frame to a 193-bit entity. The frame bit is used for a variety of purposes that will be discussed in a moment. Regenerators Figure 1-22 Creating a T-Carrier frame. F 8-bits per sample, 24 samples per frame + frame bit = 193 bits.

SONET Bandwidth The SONET frame consists of 810 eight-bit bytes, and like the T-1 frame, it is transmitted once every 125 ␮sec (8,000 frames per second). 84 Mbps, the fundamental transmission rate of the SONET STS-1 frame. 736 Mbps DS-3, a respectable carrier level by anyone’s standard. What if more bandwidth is required, however? 84 Mbps, such as a 100 Mbps Fast Ethernet signal? 84 Mbps? In those cases, we have to invoke more of SONET’s magic.

The bulk of the frame itself, to the left, is the synchronous payload envelope (SPE), which is the container area for the user data that is being transported. The data, previously identified as the payload, begins somewhere in the payload envelope. The actual starting point will vary, as we will see later. The Path Overhead begins when the payload begins; because it is unique to the payload itself, it travels closely with the payload. The first byte of the payload is the first byte of the Path Overhead.

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Hungarian olympiad problem book 2 by Jozsef Kurschak, Elvira Rapaport


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