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)