公开(公告)号：US3566031A

公开(公告)日：1971-02-23

申请号：US3566031D

申请日：1968-12-23

Applicant: BELL TELEPHONE LABOR INC

Inventor： CARBONE JOHN T ,  MORRIS ROBERT C ,  PARKER GEORGE

IPC: H04L5/14

CPC classification number: H04L5/1423

Abstract: A data set receiver detects the direction and magnitude of the cumulative polar loop current on a full duplex two-wire line. The detected signals are applied to a signal slicer which is biased to discriminate between incoming and outgoing signals. The bias is modified to change the slicing level to compensate for the outgoing signal currents. Changes in the output of the slicer are momentarily precluded after transitions of the outgoing signals to filter out line transients. An alarm circuit for line signal failure is also included in the set.

公开(公告)号：US3573371A

公开(公告)日：1971-04-06

申请号：US3573371D

申请日：1968-12-23

Applicant: BELL TELEPHONE LABOR INC

Inventor： CARBONE JOHN T ,  PARKER GEORGE

IPC: H04L25/08 ,  H04L5/14

CPC classification number: H04L25/08

Abstract: The direction and magnitude of the cumulative polar loop currents on a full duplex two-wire line are monitored by an impedance network which is connected across the signal battery transmitter, the line loop and the line monitor in a manner which enables the monitor to detect incoming marking and spacing currents. The network is arranged to balance or cancel out ground or longitudinal currents that the line loop might apply across the monitor. The application of outgoing signal currents across the monitor is compensated by diodes which alternatively remove or insert impedances in opposing branches of the network when marking or spacing signals are being locally generated.

公开(公告)号：US3566032A

公开(公告)日：1971-02-23

申请号：US3566032D

申请日：1968-12-23

Applicant: BELL TELEPHONE LABOR INC

Inventor： CARBONE JOHN T ,  PARKER GEORGE

IPC: H04L5/14

CPC classification number: H04L5/1423

Abstract: The direction and magnitude of the cumulative polar loop current on a full duplex two-wire line are monitored by a three-level detector which determines when the incoming and outgoing current signals are both marking, both spacing, or concurrent marking and spacing. An appropriate one of the detector outputs is selected depending on whether an outgoing marking or spacing signal is being transmitted enabling the identification of incoming signals. Detection of the direction of loop current is accomplished by a pair of emitter-coupled transistor signal slicers. A third transistor signal slicer, whose emitter is coupled via a diode to the common emitter circuit, detects for the high magnitude current produced when both data sets generate spacing currents.

公开(公告)号：US3505475A

公开(公告)日：1970-04-07

申请号：US3505475D

申请日：1966-07-20

Applicant: BELL TELEPHONE LABOR INC

Inventor： CARBONE JOHN T ,  GERKENSMEIER OTTO F ,  PARKER GEORGE

IPC: H04L5/14 ,  H04L25/08 ,  H04L25/22 ,  H04M11/06 ,  H04M7/02

CPC classification number: H04L5/1423 ,  H04L25/08 ,  H04L25/22