Telephone software testing system and method
Telephone subscriber line diagnostics system and method
Telephone subscriber line fault detector
Telephone subscriber loop test system
Telephone switch dual monitors
Telephone system communication mechanism employing central offic
Telephone system diagnostic measurement system including a dista
Telephone system loop current detector
Telephony interface device for providing diagnostic...
Telephony line test unit and method
Telephony test system with adjustable output impedance
Telephony testing system
Telephony testing system
Terminal device for subscriber telephone interconnection
Test apparatus for a subscriber line
Test set interface for automatically detecting line type
Test telephone
Test unit for use at a network interface device
Test unit for use at a network interface device
Testing a subscriber terminal of a wireless telecommunications s