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  • Book Overview & Buying Understanding TCP/IP
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Understanding TCP/IP

Understanding TCP/IP

By : CP Books a.s.
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Understanding TCP/IP

Understanding TCP/IP

5 (1)
By: CP Books a.s.

Overview of this book

This book covers in detail the Open System Interconnection (OSI) reference model and the TCP/IP protocols that operate that different layers. Its coverage includes various application protocols. The authors explain in an easy-to-read style networking concepts and protocols, with examples that make the book a practical guide in addition to its coverage of theory.
Table of Contents (20 chapters)
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19
Index

3.3 Digital Circuits

Until now, we have discussed only analog circuits. Gradually, however, analog distribution is being replaced by digital distribution. Initially, this process was confined only to the phone companies. Today, even users can take advantage of digital circuits, i.e., ISDNs.

3.3.1 ISDN

Telecom companies offer the following two types of ISDN connections:

  • Basic Rate: This type of connection consists of one line (a twisted-pair) containing two B data channels, each with a capacity of 64 Kbps and one signalization D channel with a capacity of 16 Kbps.
  • Primary Rate: This type of connection consists of the following:
    • In North America: 23 B data channels, each having a capacity of 64 Kbps, and 1 D signalization channel with a capacity of 64 Kbps.
    • In Europe: 30 B data channels, each having a capacity of 64 Kbps and 1 D signalization channel with a capacity of 64 Kbps.
3.3.1 ISDN

Figure 3.14: Basic Rate and Primary Rate

The D channel is used in ISDN for signaling, i.e., for establishing a virtual...

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