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Signaling in Telecommunication Networks(2nd Edition)
(2007 Wiley)Signaling in Telecommunication Networks(2nd Edition) | | 收藏 | | | 作者 | John G. van Bosse, Fabrizio U. Devetak | | ＩＳＢＮ | 0-471-66288-7 | | 出版日期/版本 | 2007/2nd Edition | | 格式 | ＰＤＦ Adobe Acrobat |
主题内容 | | The first edition of this book covered signaling for telecommunications through the
early 1990s. Telecommunication technology has continued its remarkable progress
in the years that followed. New technologies and services have come into use, and
are supported by a number of new or expanded signaling systems. The aim of this
second edition is to cover some of the most important of these new technologies
and their signaling. Six new chapters, briefly outlined below, have been added for
that purpose.
Access systems (Chapter 8) have become a part of the local network architecture.
Several access systems (AS) surround a local exchange, each one serving the analog
and digital lines of a group of nearby subscribers. Such systems, once called ‘remote
line concentrators’, used to have proprietary interfaces to the local exchanges. Interfaces
and signaling have now been standardized, allowing a telecom to purchase
access and switching hardware equipment from different product suppliers.
In code-division multiple access (CDMA) wireless systems (Chapter 13) all
traffic channels in a cell are carried in two common (forward and reverse) frequency
channels. Individual traffic channels can be separated because the data stream from
the user is encoded at the sending end with a special bit sequence that identifies the
channel. To recover this information, the receiving end decodes the sender’s data
stream with the same sequence. Regardless of the number of cells, a CDMA
system thus needs only one pair of frequency bands. This is an important advantage
over AMPS and TDMA systems, which manage interference by assigning different
RF bands (up to seven pairs) to adjacent cells.
INAP (Chapter 18) is the ITU-T-sponsored architecture and protocol for remote
operations, equivalent to, but much more ambitious and complex than, the
Advanced Intelligent Network described in Chapter 17. INAP standards are based
on a sophisticated multi-level abstract view of features and services.
The first edition of this book did not cover networks for data communication,
which made their appearance around the 1970s. Data communication
(Chapter 20) has expanded tremendously over the last 30 years, reflecting the enormous
increase in the availability of computers and in the number of applications that
require distributed data processing. A data message consists of a sequence of
‘packets’, short data bursts that have two parts: the ‘header’, which contains signaling
information used by intermediate nodes to route the packet to its destination, and
a second part that carries user information. Among the most important innovations
in communications is the convergence of voice and data in packet networks, popularly
known as Voice over IP (VoIP). The door to convergence was opened in the
1960s with the introduction of digital voice transmission. Digitally coded speech
can be transported in a data network as a sequence of packets, each one carrying
a number of speech samples. This technology is revolutionizing telecommunications
and the driving factors for that are discussed in Chapter 20.
The most popular and widely deployed signaling protocols for VoIP, such as
H.323, SIP, H.248, and BICC are discussed in Chapter 21.
ATM, or asynchronous transfer mode (Chapter 22), closes the book with a discussion
of a packet technology that supports broadband multimedia communication,
and facilitates the interworking of packet-switched and circuit- switched networks.
Although widely deployed in carrier backbone networks and in ADSL access networks,
ATM appears to have lost momentum to packet technology based on
TCP/IP protocols.
Chapters 11 (ISUP), 14 (Introduction to Transactions), and 16 (TCAP) have been
rewritten to cover the newest developments in ITU-T standards. Chapters 1 through
7 have also been updated to reflect current standards.
[ 本帖最后由 hanswoo 于 07-5-3 20:08 编辑 ] |
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