Skip to main content

Growing Vulnerability of the Public Switched Networks Implications for National Security Emergency Preparedness (1989) / Chapter Skim
Currently Skimming:

3 Public Switched Networks in the Year 2000
Pages 22-32

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 22...
... divestiture and the introduction of competition into discrete equipment and transmission markets coincided with the advent of economically available fiber optic transmission, common channel signaling, and digital switching techniques. Together, these factors have stimulated customer demand for new services that are permissible by regulation and possible through technology.
Read the entire page →
From page 23...
... Transmission Modes The dominant force in telecommunications transmission throughout the 1990s will be the widespread deployment of optical fiber. By the mid-199Os virtually all the trunk portions of the public networks will be fiber; but fiber will be introduced only gradually into the local
Read the entire page →
From page 24...
... However, some number of terrestrial microwave routes track closely the rightsof-way used for coaxial and fiber cable routes. Such close physical proximity of alternate transmission mode routes limits the gain in network survivability that physical route diversity would otherwise provide within the public networks.
Read the entire page →
From page 25...
... There is a second simultaneous trend and countertrend in switching. Within the public networks, network intelligence is being concentrated into fewer, centralized software databases, connected by signal transfer points (STPs)
Read the entire page →
From page 26...
... Software-defined virtual networks, already introduced for large customers, will be available for many medium and small customers. Network Standards Competition in terminal equipment, the AT&T divestiture, and regulatory rules mandating equal network access to providers of information services have led to a new need for effective network standards.
Read the entire page →
From page 27...
... The effects of competition are visible in many areas of telecommunications. Local exchange carriers compete with interexchange carriers from business and government networks that partially or totally bypass the public networks.
Read the entire page →
From page 28...
... Vigorous demand for cellular service, coupled with limited spectrum availability, is driving cellular systems toward digital cellular technology, which will substantially increase channel capacity. Cellular providers are dominated by larger entities, as economies of scale enable larger companies to build cellular mobile switching nodes more efficiently.
Read the entire page →
From page 29...
... Favored applications will include network control and management, business database management, and customized consumer services, for example, custom local area signaling services, which allow residential customers to obtain centrally delivered network services hitherto economically available only to business customers (Wallace, 1988~. On balance, it appears that competition will have a detrimental impact on national security emergency preparedness (NSEP)
Read the entire page →
From page 30...
... However, distributed intelligence is encouraging a proliferation of private networks bypassing the public ones. This tends to siphon off revenues from the public network exchange carriers and to impair their ability to provide economical services.
Read the entire page →
From page 31...
... Signaling within the public networks and in private ones as well—will be software driven and subject to customer control for many functions. Data services, as prime business revenue sources, will drive network evolution.
Read the entire page →
From page 32...
... Presentation to the Committee on Review of Switching, Synchronization and Network Control in National Security Telecommunications, Washington, D.C., March 15. Stanley, T
Read the entire page →

Key Terms

  • customer demand
  • public switched
  • network control
  • optical fiber
  • telephone companies

  • switched networks
  • public network
  • network services
  • voice service
  • security telecommunications

  • network redundancy
  • data services
  • network intelligence
  • cellular mobile
  • data transmission

  • private networks
  • basic voice
  • transmission mode
  • network transmission
  • exchange carriers

  • mobile radio
  • customer control
  • terrestrial microwave
  • emergency preparedness
  • regulatory constraints

  • local exchange
  • service offerings
  • route diversity
  • network architectures
  • physically separate


    • This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
    More information on Chapter Skim is available.