T1 channel bank control process and apparatus
Technique for reducing echoes in conference communications
Telecommunication line circuit
Telecommunications apparatus and plug-in unit for same
Telecommunications chassis and card
Telecommunications system, an automatic branch exchange, a line
Telephone battery feed circuit including noise reduction circuit
Telephone circuit using DC blocked transformer and negative impe
Telephone headset interface circuit
Telephone headset interface circuit
Telephone line interface circuit
Telephone line sourced power supply
Telephone network speech signal enhancement
Telephone network speech signal enhancement
Telephone NID isolation module
Telephone power distribution and isolation system
Telephone set
Telephone subscriber circuit
Telephone subscriber line module
Telephone-coupled device for internet access