Wiring scheme and network adapter with digital and analog outputs to allow old pots coexistence with ISDN

• US 5,448,635 A
• Filed: 06/30/1993
• Issued: 09/05/1995
• Est. Priority Date: 06/30/1993
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Sederholm, Charles H., Hallock, Charles C., Landa, Robert E., Jones, Joe F. Jr., Biehl, Robert E., Mandalia, Baiju D.
• Primary Examiner(s): Dwyer, James L.
• Assistant Examiner(s): SAINT SURIN, JACQUES M
• Application Number:
  US08/085,333
• Time in Patent Office: 797 Days
• Field of Search: 379/399, 379/339, 379/96, 379/96, 370/110.1, 370/60
• US Class Current: 379/399.02
• CPC Class Codes: H04M 1/253 Telephone sets using digital voice transmission
• CPC Class Codes: H04Q 11/0471 Terminal access circuits
• CPC Class Codes: H04Q 2213/09 Subscriber related equipment; Analog terminal
• CPC Class Codes: H04Q 2213/096 Digital subscriber terminal
• CPC Class Codes: H04Q 2213/13034 A/D conversion, code compression/expansion
• CPC Class Codes: H04Q 2213/1307 Call setup
• CPC Class Codes: H04Q 2213/1309 Apparatus individually associated with a subscriber line, line circuits
• CPC Class Codes: H04Q 2213/13096 Digital apparatus individually associated with a subscriber line, digital line circuits
• CPC Class Codes: H04Q 2213/13103 Memory
• CPC Class Codes: H04Q 2213/13173 Busy signals
• CPC Class Codes: H04Q 2213/13176 Common channel signaling, CCS7
• CPC Class Codes: H04Q 2213/13202 Network termination [NT]
• CPC Class Codes: H04Q 2213/13209 ISDN
• CPC Class Codes: H04Q 2213/13216 Code signals, frame structure
• CPC Class Codes: H04Q 2213/13299 Bus
• CPC Class Codes: H04Q 2213/299 Bus

Abstract

A network adapter and wiring scheme makes use of existing plain old telephone service (POTS) wiring to provide support between analog devices within the subscriber premise and an Integrated Digital Service Network (ISDN). Moreover, the network adapter and wiring scheme provides further support between digital devices within the premise and the ISDN while concurrently supporting analog devices.

Claims

1. A communication system for connecting analog or digital devices in a subscriber premise to an ISDN digital network via "POTS" (plain old telephone service) wires linking said subscriber premise to said network, wherein said POTS wires consist of a first set of wires connected to said network and a second set of wires connected to said analog devices and not connected to said network, said system comprising:

an adapter for processing signals;

first connecting means connecting said adapter to both said first and said second sets of POTS wires;

said first connecting means serving to (a) transfer digital signals between said adapter and said first set of POTS wires such that digital signals in predetermined instances are conducted between said adapter and said network via said first set of POTS wires, and (b) transfer analog signals between said adapter and said second set of POTS wires such that analog signals in predetermined instances are conducted between said adapter and said analog devices via said second set of POTS wires; and

converting means in said adapter for converting signals transferred between said network and said first connecting means so as to sustain communication between said network and said analog devices, via said first and second sets of POTS wires and said first connecting means;

said converting means converting said signals between forms uniquely suited to said network and said analog devices.

2. The apparatus as in claim 1, further comprising:

a second connecting means for connecting said adapter to said digital devices; and

said converting means in said adapter further converting signals transferred between said network, said first connecting means and second connecting means so as to sustain communication concurrently between said network and said digital devices, via said first set of POTS wires, said first connecting means and said second connecting means;

said converting means further converting said signals between forms uniquely suited to said network, and said digital devices.

3. An arrangement for linking both analog and digital devices in a subscriber premise to a digital telephone network, said arrangement using pre-existing telephone wiring and wall jacks in said premises that could be used for providing analog signalling services to said premise, said wiring comprising two discrete pairs of signal wires, said wall jacks including at least two jacks, said arrangement comprising:

means connecting one of said two pairs of signal wires to said digital telephone network while isolating the other of said two pairs of signal wires from said network, said other of said two pairs of signal wires being connected to said analog devices; and

signal conversion means pluggably connected to any one of said wall jacks for interfacing between said two pairs of signal wires and both digital and analog devices located in said premise;

said signal conversion means comprising;

first converting means, coupled between said one of said two pairs of signal wires and said digital devices, for converting two wire subscriber loop signals between a first standardized digital form used by said carrier network and a second standardized digital form used by said digital devices, and

second converting means, coupled to said one and said other of said two pairs of signal wires, for converting two wire subscriber loop signals between said first standardized digital form used by said carrier network and an analog form used by analog devices connected to any wall jack other than the one to which said conversion means is connected.

4. An arrangement for adapting a telephone subscriber premise containing pre-existing telephone wiring to use both analog and digital devices while being served by a telephone carrier network providing only two wire subscriber loop digital service;

wherein said wiring comprising two pairs of "internal" telephone wires extending between a junction box that connects said premise to said carrier network and multiple modular telephone jacks situated on inside walls of said premise;

said arrangement comprising;

means at said junction box forming a connection exclusively between one of said pairs of wires and a pair of wires external to said premise extending to said telephone carrier network; and

digital conversion apparatus connected to both of said pairs of internal wires at any one of said inside wall jacks through a modular plug;

said conversion apparatus receiving and transmitting only baseband digital signals via said one of said pairs of wires that is connected to said telephone network at said junction box;

said conversion apparatus receiving and transmitting only analog signals via the other pair of internal wires that is not connected to said carrier network at said junction box;

said analog signals being conveyed thereby between said any one inside wall jack and an analog telephone device having an ordinary plug connection at any other said inside jack to only said other pair of internal wires;

said conversion apparatus comprising;

a bus interface for connecting to one or more digital devices in said premise;

digital signal conversion means connected to said bus interface for converting digital signals between a form used at said bus interface and a standard digital channelized form used in said telephone carrier network;

analog to digital signal conversion means connected to said other pair of internal wires for converting signals between an analog form, used by an analog device attached to said other pair of wires at said any other inside jack, and said standard digital channelized form used by said telephone carrier network; and

means, coupled between said one pair of internal wires that connects to said network and both said converting means, for selectively transferring digital signals, arranged in said standard digital channelized form, between said one pair of internal wires and each of said conversion means whereby signals representing digital data and analog functions such as voice in predetermined instances are concurrently transported between said network and digital and analog devices respectively coupled to said digital form conversion means and said analog to digital conversion means.

5. A method for linking both analog and digital devices using pre-existing telephone wires to a two wire subscriber loop digital carrier network, wherein said network is connected to one pair of said pre-existing telephone wires and analog devices are connected to another pair of said pre-existing telephone wires, said method comprising:

converting signals on said two wire subscriber loop, carried on said one pair of pre-existing telephone wires, between a standardized digital form used by said network and an analog form used by said analog devices; and

concurrently converting signals on said two wire subscriber loop, carried on said one pair of pre-existing telephone wires, between a first standardized digital form used by said network and a second standardized digital form used by said digital devices.

6. A telephone communication system comprising:

an ISDN network;

an adapter for processing signals;

at least one analog device;

a first pair of telephone wires operatively connected to said adapter and said ISDN network, said first pair of telephone wires providing a communication path between said adapter and said ISDN network;

a second pair of telephone wires operatively connected to said adapter and said analog devices, said second pair of telephone wires providing a communication path between said adapter and said analog devices; and

means, within said adapter, for converting signals transferred between said network and said analog devices so as to sustain communication between said network and said analog devices, via said first and second pairs of wires;

said converting means converting said signals between forms uniquely suited to said network and said analog devices.

7. A telephone communication system as in claim 6, further comprising:

at least one digital device;

a connecting means for connecting said adapter to said at least one digital device; and

said means, within said adapter, further converting signals transferred between said network and said digital devices so as to sustain communication between said network and said digital devices via said first pair of wires and said connecting means;

said converting means converting said signals between forms uniquely suited to said network and said digital devices.

8. A telephone communication system as in claim 7, wherein said means, within said adapter, concurrently sustains communication between signals on said network and said analog devices on said first and second pairs of wires and between signals on said carrier network and said digital device via said first pair of wires and said connecting means.