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overlay networks. The public switched network, or circuit |
network, mainly for voice, is the base network. Two kinds of |
overlay networks provide special services. Channel networks |
carry private lines leased by large customers and transmit |
much of today's data and image traffic; they also handle |
traffic for network operations support. Packet networks |
carry data communications, while packet switching is used |
internally to public networks for common channel signaling to |
set up, route and take down calls, or to give customers |
information. |
"Overlay networks help telecommunications companies |
efficiently meet growing demand for digital transmission and |
special services," says Stan Johnston, Market Planning |
Manager, Network Systems Evolution, in AT&T Network Systems. |
"Their integration into a single network, however, would be |
still more effective." |
Phase two, the Integrated Services Digital Network (ISDN). |
~~~~~ ~~~~ ~~~ ~~~~~~~~~~ ~~~~~~~~ ~~~~~~~ ~~~~~~~ ~~~~~~~ |
The ISDN is a concept to which AT&T is committed - and it's |
the foundation for Universal Information Services. The |
central idea of ISDN, as AT&T Network Systems sees it, is to |
provide an individual user a link to the local central office |
of generous band-width - a digital subscriber line that can |
carry 144,000 bits per second (sure beats 2400 baud!). The |
band-width is subdivided into two 64,000-bit channels, which |
may carry voice or data or both, and one 16,000-bit channel |
for packetized signaling information or data transport. Such |
a link provides convenient "integrated" network access by |
accommodating voice, data and signaling over a single line. |
The ISDN will make it easier for a customer to get |
varied services from public and private networks. More |
bandwidth for big customers will be available through another |
ISDN access standard, the extended digital subscriber line, |
which provides 1.5 billion bits per second as 24 channels of |
64,000 bits each. |
In 1986, new software from Bell Labs will enable the |
5ESS switch to accommodate ISDN-sized 144,000-bit channels |
that standardize and simplify subscribers' use of local |
networks. AT&T is committed to future products that will |
also be ISDN-compatible. Other vendors, too, some of whom |
already plan to build premises, terminal, and other |
equipment to ISDN standards, will make ISDN a cooperative |
effort. |
By providing integrated digital access to networks, |
ISDN will make important progress toward the goal of |
Universal Information Services. But overlay networks will |
continue to divvy up the transport job. And messages needing |
less than 144,000 bits per second will not fill their |
allotted bandwidth, leaving capacity underutilized. |
Phase three, Universal Information Services. |
~~~~~ ~~~~~~ ~~~~~~~~~ ~~~~~~~~~~~ ~~~~~~~~~ |
Rooted in the fertile ground of 5ESS switches, ISDN equipment |
and technologies such as wideband packet transport, Universal |
Information Services will bear fruit during the 1990s. From |
a single kind of network will hang services as different as |
apples, oranges and pears. Just as network access was |
integrated in ISDN, transport functions will increasingly be |
integrated by powerful new network equipment evolved from |
equipment developed for the ISDN. Where customers once got |
standard-sized ISDN channels, they'll get big bandwidth for |
large jobs, little bandwitdh for small jobs. |
==Phrack Inc.== |
Volume One, Issue Two, Phile 7 of 9 |
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@ @ |
@ _ _ _______ @ |
@ | \/ | / _____/ @ |
@ |_||_|etal / /hop @ |
@ __________/ / @ |
@ /___________/ @ |
@ Headquarters of Phrack Newsletter @ |
@ @ |
@ (314) 432-0756 @ |
@ @ |
@ Proudly Presents @ |
@ @ |
@ MCI Overview @ |
@ @ |
@ Written on 11/16/85 @ |
@ @ |
@ by @ |
@ @ |
@ Knight Lightning & Taran King @ |
@ @ |
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MCI Communications Corporation, headquartered in Washington, D.C., provides a |
full range of domestic and international telecommunications services, including |
voice and data, telex and cable, paging and mobile telephone, and time |
sensitive message delivery. |
Since its founding in 1968, MCI has grown to more than $1.6 billion in annual |
sales and serves more than 1.9 million business, residential and government |
customers through its four major business units: |
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