CA2255461A1 - A circuit to provide backup telephone service for a multiple service access system using a twisted pair - Google Patents

A circuit to provide backup telephone service for a multiple service access system using a twisted pair

Info

Publication number
CA2255461A1
CA2255461A1 CA002255461A CA2255461A CA2255461A1 CA 2255461 A1 CA2255461 A1 CA 2255461A1 CA 002255461 A CA002255461 A CA 002255461A CA 2255461 A CA2255461 A CA 2255461A CA 2255461 A1 CA2255461 A1 CA 2255461A1
Authority
CA
Canada
Prior art keywords
isd
twisted pair
fmp
subscriber
dlc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002255461A
Other languages
French (fr)
Other versions
CA2255461C (en
Inventor
Farhad Barzegar
Irwin Gerszberg
Philip Andrew Treventi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
AT&T Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AT&T Corp filed Critical AT&T Corp
Priority to CA002359340A priority Critical patent/CA2359340C/en
Publication of CA2255461A1 publication Critical patent/CA2255461A1/en
Application granted granted Critical
Publication of CA2255461C publication Critical patent/CA2255461C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/08—Indicating faults in circuits or apparatus
    • H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/005—Interface circuits for subscriber lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/2209—Arrangements for supervision, monitoring or testing for lines also used for data transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
    • H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop

Abstract

Abstract of the Disclosure A subscriber link to a central office which employs data compression, forward error correction, and advanced modulation techniques and to connect subscribers to multiple communications networks to provide an array of services. A device provides normal telephone service in the event of an equipment failure. At the subscriber end, a server called an intelligent services director (ISD) provides multiple independent connections for telephones which ordinarily connect to multiple access virtual circuits generated on the subscriber link over a twisted pair.
A device called a facilities management platform (FMP) at the central office end of the link, among other things, provides interfacing of the subscriber link to various networks including a digital subscriber loop (DLC) and packet switched networks.Ordinarily telephones connected to the ISD require power and correctly functioning modems and controllers in the ISD and the FMP to have access to the outside world. A fail-safe mechanism, however allows at least one chosen phone to function in the event of a failure. The chosen phone must be capable of pulse orDTMF dialing. The connection through which it operate can be switched directly to the twisted pair media connecting to the FMP. At the FMP, the twisted pair is switched to tie the connection directly to a line card of the DLC. Alternatively, the ISD contains an interface to a specialized phone designed for the ISD environment.
The interface provides the appearance to the DLC of a regular POT
CA002255461A 1997-12-31 1998-12-10 A circuit to provide backup telephone service for a multiple service access system using a twisted pair Expired - Fee Related CA2255461C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002359340A CA2359340C (en) 1997-12-31 1998-12-10 A circuit to provide backup telephone service for a multiple service access system using a twisted pair

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/001,343 US6347075B1 (en) 1997-12-31 1997-12-31 Circuit to provide backup telephone service for a multiple service access system using a twisted pair
US09/001,343 1997-12-31

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA002359340A Division CA2359340C (en) 1997-12-31 1998-12-10 A circuit to provide backup telephone service for a multiple service access system using a twisted pair

Publications (2)

Publication Number Publication Date
CA2255461A1 true CA2255461A1 (en) 1999-06-30
CA2255461C CA2255461C (en) 2002-08-06

Family

ID=21695564

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002255461A Expired - Fee Related CA2255461C (en) 1997-12-31 1998-12-10 A circuit to provide backup telephone service for a multiple service access system using a twisted pair

Country Status (2)

Country Link
US (5) US6347075B1 (en)
CA (1) CA2255461C (en)

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Also Published As

Publication number Publication date
US20090034409A1 (en) 2009-02-05
US6347075B1 (en) 2002-02-12
US20020027876A1 (en) 2002-03-07
CA2255461C (en) 2002-08-06
US20050128941A1 (en) 2005-06-16
US6868060B2 (en) 2005-03-15
US20020027927A1 (en) 2002-03-07
US7394757B2 (en) 2008-07-01

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