Grievance call processing system
Ground fault detector
Ground fault detector for T1 span equipment
Ground key detector for a SLIC
Ground start circuit
Hand-held telecommunication loop testing device
Hand-held telephone line signaling test instrument
Handset identifier using support vector machines
High impedance absolute telephone line voltage measurement...
High speed automatic test apparatus especially for electronic di
Hot cut procedure for telecommunications network
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