Telephonic communications – Special services – Anonymous party
Patent
1994-07-19
1996-10-15
Barry, Esq., Lance Leonard
Telephonic communications
Special services
Anonymous party
379 90, 379 93, 379 96, 39520017, 395250, 395850, 395872, 395877, 39520013, 36429294, 364DIG1, 3642222, 3642379, 3642385, 3642396, 3642397, 36424296, H04L 1200
Patent
active
055663010
DESCRIPTION:
BRIEF SUMMARY
This is a continuation-in-part of PCT International Patent Applications that designated the U.S. Nos. PCT/US92/01084 filed 11 Feb. 1992, that was published 19 Aug. 1993, International Publication No. W0 93/16557; PCT/US92/01446 filed 24 Feb. 1992, that was published 2 Sep. 1993, International Publication No. WO 93/17526; and PCT/US92/04944 filed 11 Jun. 1992, that was published 23 Dec. 1993, International Publication No. WO 93/26095.
TECHNICAL FIELD
The present invention relates generally to the technical field of digital telecommunication and, more particularly, to communicating audiovisual information using digital telecommunications services such as Integrated Services Digital Network ("ISDN") communication.
BACKGROUND ART
To deal rationally with the complexity of present communication systems and with the need to make different systems mutually compatible, the International Standards Organization ("ISO") developed a model for specifying such systems. Using this model, called the Open Systems Interconnect ("OSI") model, a communication system can be broken down into a hierarchial structure that permits standards to be defined at each level in the structure. The OSI model provides a hierarchy of seven different layers that can occur in a communication system. Each layer in the OSI model specifies a different function performed by the communication system.
The lowest layer in the OSI model, called the physical layer, specifies the physical structure of interfaces in a particular communication system or network. Thus, a standard for the physical layer of a communication system specifies such things as the number of wires, their electrical characteristics, the characteristics of signals transmitted over the wires, connectors used for joining two sets of wires into a single longer set of wires, etc.
The next higher layer in the OSI model, called the data link layer, specifies how data is transmitted error free through the communication system. Thus, a standard for the second layer in the OSI model specifies how to detect errors in transmissions passing over the physical layer, and how to correct any errors that may occur during transmission.
The next higher layer in the OSI model, called the network layer, specifies the manner in which connections are formed between various places in the communication system for transmitting data between them. The standard for the third layer in the OSI model, therefore, specifies the signals transmitted over the data link layer that cause the communication system to transfer data between two places on the network.
A recommendation by an International Telegraph and Telephone Consultative Committee ("CCITT") for the ISDN communication channel specifies the three lowest levels in the OSI model. Under the CCITT recommendation, a basic ISDN access consists of two full-duplex 64 kilobits per second ("kbps") digital data channels, called channel B1 and channel B2, plus another full-duplex 16-kbps digital channel, called a D-channel. Under the CCITT recommendation, using time division multiplexing, all three of these digital data channels may be transmitted over a single pair of twisted wires, or over two pairs of twisted wires. ISDN basic rate access, as specified by CCITT, was originally intended to provide a basic digital data transmission capability suitable for use by individuals such as in their homes or small businesses.
When ISDN basic rate access was initially specified, each of the B-channels was intended to carry either: terminal; digitized voice that were each encoded at a fraction of each B-channel's full 64-kbps capacity.
Under the ISDN recommendation, the D-channel serves two purposes. First, the D-channel carries signaling information that controls the transmission of data over the two B-channels. In addition, when the D-channel is not carrying signaling information, it may be used to transmit packet-switching or low-speed telemetry. The combined data rate at which digital data may be transmitted over twisted pairs of wires in accordance with the ISDN recommen
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Koz Mark C.
Lix Jack W.
Barry, Esq. Lance Leonard
FutureTel, Inc.
Schreiber Donald E.
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