公开(公告)号：DE2556600A1

公开(公告)日：1976-07-01

申请号：DE2556600

申请日：1975-12-16

Applicant: NORTHERN TELECOM INC

Inventor： OSBORNE DEANE C ,  HARRISON JOHN M ,  HILLMAN ALFRED K

IPC: G01D5/12 ,  H04M3/32 ,  H04B17/00 ,  H04B3/46

Abstract: Improvements in apparatus for measuring characteristics of a communications channel, characterized in that a programmable local unit is arranged in one of two terminals between which the measurement is made, to exchange analog test signals with the communication channel; a central digital computer device for exchanging digital information signals with the programmable local unit, and a first communication link between the control device and the local unit for retransmitting said digital information signals. (Machine-translation by Google Translate, not legally binding)

公开(公告)号：CA1054258A

公开(公告)日：1979-05-08

申请号：CA241754

申请日：1975-12-15

Applicant: NORTHERN TELECOM INC

Inventor： OSBORNE DEANE C ,  HARRISON JOHN M ,  HILLMAN ALFRED K JR

IPC: G01D5/12 ,  H04M3/32 ,  G08C25/00 ,  G06F15/20

Abstract: A communications line under test intercouples programmable local units, one of which transmits an analog waveform to the other in response to digital control signals received from a computer. The receiving programmable local unit transmits a digital signal to the computer representative of the received analog signal to thereby enable the computer to determine transmission characteristics of the communications line intercoupling the programmable local units.