Browse Prior Art Database

Integration of Integrated Services Digital Network in an Object Structure

IP.com Disclosure Number: IPCOM000102200D
Original Publication Date: 1990-Nov-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 5 page(s) / 163K

Publishing Venue

IBM

Related People

Herring, JJ: AUTHOR [+2]

Abstract

A Network Interface Description, which integrates the Integrated Services Digital Network's (ISDN's) multiple, non-homogenous data links into an existing communications object hierarchy, is disclosed. It is a new object describing the various data and voice bearer channels that are controlled by one signalling channel, and may span more than one physical ISDN interface. This object provides the new level of multiplexing required to allow the existing communications objects to remain relatively unchanged when participating in an ISDN environment.

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Integration of Integrated Services Digital Network in an Object Structure

       A Network Interface Description, which integrates the
Integrated Services Digital Network's (ISDN's) multiple,
non-homogenous data links into an existing communications object
hierarchy, is disclosed.  It is a new object describing the various
data and voice bearer channels that are controlled by one signalling
channel, and may span more than one physical ISDN interface.  This
object provides the new level of multiplexing required to allow the
existing communications objects to remain relatively unchanged when
participating in an ISDN environment.

      ISDN provides a set of high speed, digital interfaces for data
and voice communications.  This physical interface is subdivided into
several logical bandwidths using Time Division Multiplexing (TDM).
These bandwidths are referred to as channels and are categorized as
bearer channels (referred to as B-channels) and signalling channel
(the D-channel).  B-channels are used to transmit data, voice or
image at 64 Kbps and may be "switched" to any other end node in the
network, analogous to today's telephone network's switched lines.
The D-channel is used to communicate with the network in order to
establish and terminate these switched connections.  Fig. 1 depicts
the relationship of ISDN channels and end nodes.

      There are two types of interface:
      1.   Basic Rate Interface (BRI) - The Basic Rate Interface is
subdivided into two B-channels and a D-channel, which runs at 16
Kbps.  This is sometimes referred to as 2B+D.  Fig. 1 illustrates
three nodes, each with a Basic Rate Interface.
      2.   Primary Rate Interface (PRI) - The Primary Rate Interface
is subdivided into 23 (in North America and Japan) or 30 (in Europe)
B-channels and a 64 Kbps D-channel.  The B-channels of the Primary
Rate Interface may be combined to form hyper channels, or H-channels.
Furthermore, in North America, the D-channel of one interface may do
the signalling for one or more interfaces, freeing up the bandwidth
usually reserved for signalling on those interfaces to use as a
B-channel or part of an H-channel.  PRI is sometimes referred to as
23B+D or 30B+D.

      AN OBJECT-ORIENTED DATA COMMUNICATIONS MODEL:
 Most implementations of a data communications configuration con tain
a set of elements which describe the hardware and protocols required
to communicate in a meaningful way with another terminal or
application.  Depending on the interfaces and protocols supported by
the system, these may be organized differently in some models.  One
such organization may be in objects, where information describing
various components of the physical and logical network is kept.

      For ISDN, the most significant object type is the Network
Description (ND) object.  The ND describes both the physical
interface to the network and the Data Link Control (DLC) protocol
used to communicate with the o...