Identification of damaged cable pairs in a telecommunications ne
Impedance blocking filter circuit
Impedance blocking filter circuit
Impedance blocking filter circuit
Impedance blocking filter circuit
Impedance measuring apparatus for R.F. baseband signals over two
In-line switched telephone line tester
In-line telephony data protector with line condition announce
Incentive-based DSL system
Individual telephone line call event buffering system
Indoor telephone network interface device
Inductive amplifier having automatic gain control for butt set
Inductive amplifier having comb filter
Information terminal apparatus
Informing system
Instructive out-of-service telephone lines
Integrated bit error rate test function in analog channel unit o
Integrated communication error reporting system
Integrated international telephone circuit monitoring system
Integrated metallic access for high port density DSLAM