Loop status verification system

Loop-back test system using a suppressed ringing connection

Measurement of transmission quality of a telephone channel

Method and apparatus for dispatching services

Method and apparatus for testing cables

Method for measuring quality determining parameters of a firmly

Method for measuring the bit error rate in the transmission of d

Method for performing continuity check in an electronic exchange

Method for testing the line connection before switching from a t

Method of adapting processing parameters in a call processing sy

Method of controlling time switch for diagnosing failure on call

Method of rapidly assessing damage to outside loop plant

Non-interfering method for measuring propagation delay of teleco

Personal virtual assistant

Programmable automatic call-thru set

Qualifying telephone line for digital transmission service

Qualifying telephone line for digital transmission service

Remote disconnection and short-circuiting apparatus and method

Remote testing of metallic loops with a trans hybrid signal

Self calibration arrangement for a voice switched speakerphone