T1 digital communications system for in-service detection and identification of malfunctioning repeaters
AssigneeTelecommunications Techniques Corporation
InventorJeremy E. Parsons
Life of this patent
Estimating the term…
Abstract
An improvement to T1 digital communications systems uses the alternate mark inversion (AMI) encoding format, typically used in T1 systems, and the D.C. system that powers the repeaters for enabling quick and accurate in-service detection and identification of malfunctioning or failed repeaters.
Claims11
In a T1 digital communications system using alternate mark inversion encoding and including first terminating equipment having a substantially constant voltage D.C. electrical power source, second terminating equipment, and a plurality of signal repeaters, each repeater comprised of a plurality of signal regenerator circuits each having an input and an output and each repeater connected in duplex electrical circuit relationship between said first and said second terminating equipment and in D.C. circuit relationship with said D.C. power source and said second terminating equipment, the improvement comprising apparatus for in-service detection and identification of malfunctioning or failed said repeaters, said apparatus comprising:
- first means in operative relationship with outputs of each of said regenerator circuits for detecting unintentional bipolar violations;
- impedance means in series D.C. circuit relationship with said D.C. power source, with said second terminating equipment and with first predetermined of said regenerator circuits;
- means in circuit relationship with said first detecting means and with said impedance means for changing impedance values of said impedance means by a predetermined amount in response to detection of unintentional bipolar violations by said first detecting means;
- means in circuit relationship with said first predetermined regenerator circuits, with said impedance means and with said D.C. power source for monitoring the voltage drop across said predetermined regenerator circuits and said impedance means;
- second means in operative relationship with second predetermined of said regenerator circuits for detecting unintentional bipolar violations from said second predetermined regenerator circuits;
- and
- means in operative relationship with said voltage monitoring means and with said second detecting means for determining and indicating the occurrence and location of a malfunctioning said repeater.
In a T1 digital communications system using alternate mark inversion encoding and including first terminating equipment having a substantially constant voltage D.C. electrical power source, second terminating equipment, and a plurality of signal repeaters, each repeater comprised of a plurality of signal regenerator circuits each having an input and an output and each repeater connected in duplex electrical circuit relationship between said first and said second terminating equipment and in D.C. circuit relationship with said D.C. power source and said second terminating equipment, the improvement comprising apparatus for in-service detection and identification of malfunctioning or failed said repeaters, said apparatus comprising:
- first means in operative relationship with each of said repeaters for detecting the occurrence of a malfunction or failure of each said repeater;
- impedance means in series D.C. circuit relationship with said D.C. power source, with said second terminating equipment and with first predetermined of said regenerator circuits;
- means in circuit relationship with said first detecting means and with said impedance means for changing impedance values of said impedance means by a predetermined amount in response to detection of a malfunction or failure of said repeater by said first detecting means;
- means in circuit relationship with said first predetermined regenerator circuits, with said impedance means and with said D.C. power source for monitoring the voltage drop across said predetermined regenerator circuits and said impedance means;
- second means in operative relationship with said repeaters for detecting a malfunction or failure of one or more of said repeaters;
- and
- means in operative relationship with said voltage monitoring means and with said second detecting means for determining and indicating the occurrence and location of a malfunctioning said repeater.
Dependencies are inferred from the claim text.