Browse Prior Art Database

Support for Multiple Electrical Interfaces with a Single Electronic Assembly, with Selection by Means of Unique Cables

IP.com Disclosure Number: IPCOM000121641D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 5 page(s) / 144K

Publishing Venue

IBM

Related People

Johnson, DWJ: AUTHOR [+2]

Abstract

Some electronic products (e.g., communication products) are required to operate in a variety of environments. In many cases, the major portion of the product remains unchanged, but one or more interfaces must be different. Examples include products that must operate over multiple ranges of line voltage, or connect to telecommunication networks with different interfaces.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Support for Multiple Electrical Interfaces with a Single Electronic
Assembly, with Selection by Means of Unique Cables

      Some electronic products (e.g., communication products)
are required to operate in a variety of environments.  In many cases,
the major portion of the product remains unchanged, but one or more
interfaces must be different.  Examples include products that must
operate over multiple ranges of line voltage, or connect to
telecommunication networks with different interfaces.

      Such interfaces are characterized by the fact that each variety
requires a distinct cable connector.

      In some cases (telecommunications is one such case) the cost of
including the electronic components necessary to connect to all the
possible networks is far lower than the design, testing, production
and stocking costs associated with maintaining multiple, unique
assemblies for each network, given that a reliable foolproof method
is provided to assure that the correct interface drivers and
receivers are connected and that the correct impedance is presented
to the network.

      The invention will mostly be described in terms of
telecommunication networks, but it is not limited to that
application.  It can be applied to any connection interface with
multiple variations including, for example, line voltage connections.

      This invention takes advantage of the fact that each network
requires a different connector, and, hence, a different cable (or
possibly a compound cable) is required for each case.  The invention
has several distinct parts described below.

      A communication product (DTE) must connect to any of three
communication interfaces (DCEs), commonly identified by their CCITT
Recommendations: V.11, V.28, and V.35.  Each of these interfaces has
several circuits incoming to the DTE (e.g., Receive Data, Clock,
Clear to Send) and several that are produced by the DTE (e.g.,
Transmit Data, Request to Send).  For clarity, the figures that
illustrate this invention will show only one of these circuits.
Figs. 1,2 and 3 identify the elements involved and their
relationships for each of the three network interfaces.

      Drivers are the elements that convert signals generated in the
logic of the product to the levels and characteristics required by
the interface.

      It can generally be assumed that the logic can supply signals
to more than one dr...