公开(公告)号：US3133152A

公开(公告)日：1964-05-12

申请号：US17833562

申请日：1962-03-08

Applicant: BELL TELEPHONE LABOR INC

Inventor： BACHELET ALBERT E ,  CROWSON FRED B ,  LARGE WAYNE V K ,  MARTINGANO GERALD A ,  PREVITE RICHARD A ,  REHM THEODORE C ,  SMITH TODD A

IPC: H04L12/00

CPC classification number: H04L12/00

公开(公告)号：US3435142A

公开(公告)日：1969-03-25

申请号：US3435142D

申请日：1965-08-16

Applicant: BELL TELEPHONE LABOR INC

Inventor： CROWSON FRED B ,  GROTH GEORGE S

IPC: H04L5/00 ,  H04L25/20 ,  H04L15/00 ,  H04L25/52

CPC classification number: H04L5/00

公开(公告)号：US2978534A

公开(公告)日：1961-04-04

申请号：US76051158

申请日：1958-09-11

Applicant: BELL TELEPHONE LABOR INC

Inventor： CROWSON FRED B ,  LOCKE GEORGE A ,  MACLAUGHLIN RALPH R

IPC: H04L12/54

CPC classification number: H04L12/54

公开(公告)号：US3591719A

公开(公告)日：1971-07-06

申请号：US3591719D

申请日：1968-06-07

Applicant: BELL TELEPHONE LABOR INC

Inventor： CROWSON FRED B ,  PREVITE RICHARD A

IPC: H04L12/26 ,  H04L25/04 ,  H04L25/02

CPC classification number: H04L43/50

Abstract: An automatic test circuit for simultaneously testing a plurality of data sets wherein the test circuit provided for each data set a multiphase program which includes sending test signals to the data set and measuring the distortion of signal received from the data set. During a measuring phase the test circuit enables each data set to contend for a common measuring circuit to apply signals to the measuring circuit upon seizure thereof and to thereafter release from the measuring circuit in response to a signal from the data set. The test circuit then either advances to the next program phase if the distortion of the measured signals is below a predetermined threshold level or again bids for the measuring circuit to repeat the measuring phase if the distortion exceeds the threshold level.

公开(公告)号：US3206551A

公开(公告)日：1965-09-14

申请号：US7178260

申请日：1960-11-25

Applicant: BELL TELEPHONE LABOR INC

Inventor： CROWSON FRED B ,  MICHEL WALTER S

IPC: H04M1/27 ,  H04M1/57

CPC classification number: H04M1/27 ,  H04M1/57

公开(公告)号：US3136851A

公开(公告)日：1964-06-09

申请号：US15249061

申请日：1961-11-15

Applicant: BELL TELEPHONE LABOR INC

Inventor： CROWSON FRED B ,  ROBERTS VINCE M

IPC: H04L12/26 ,  H04L25/04

CPC classification number: H04L43/50