Communications

Telephonic Communications

Including Fault Responsive Disconnection Of Tested Component

No:6574311

Apparatus and method for detecting a bridged tap and/or an end-of-line of a conventional telephone line using delay-line time-domain reflectometry

No:6014425

Apparatus and method for qualifying telephones and other attached equipment for optimum dsl operation

No:3864533

Automatic line transfer system and method for a communications system

No:4455645

Back-up control system implemented with a redundancy scheme for protection against failure

No:5719917

Circuit for activating back-up lines

No:5457729

Communication network signalling system link monitor and test unit

No:5483574

Communication terminal equipment

No:5768341

Communications channel testing arrangement

No:5937029

Data logging system employing m n +1! redundancy

No:5436953

Digital longitudinal balance measurement

No:5142571

Digital telephone set having an emergency switching function and communication system having the same

No:4059736

Dual testing system for supervising duplicated telecommunication equipment

No:6356625

Environment monitoring telephone network system

No:4853949

Fail safe voice system for integrated services for digital network subscribers

No:4743887

Fault locating system and method

No:5862200

Ground fault detector for t1 span equipment

No:5577099

Inductive amplifier having comb filter

No:6425132

Ingress testing of catv system utilizing remote selection of catv node

No:6239699

Intelligent alarm filtering in a telecommunications network

No:5293556

Knowledge based field replaceable unit management

No:5590171

Method and apparatus for communications monitoring

No:5146452

Method and apparatus for rapidly restoring a communication network

No:7031435

Method and apparatus for simultaneous line-interface wiring collision detection

No:6449365

Method and apparatus providing notification of network conditions

No:5367562

Method and device for returning to a normal communication link after using a standby link

No:7076030

Method and system for testing xdsl wiring

No:5835564

Method for enhancing the reliability of a wireless telecommunications system

No:7042984

Method for inspecting transmission channels in a communications system having peripheral modules

No:6367035

Methods and apparatus for diagnosing and correcting faults in computers by a support agent at a remote location

No:6072857

Methods and system for monitoring the operational status of a network component in an advanced intelligent network

No:6636585

Metrics-related testing of an operational support system (oss) of an incumbent provider for compliance with a regulatory scheme

No:6282271

Modem protection device

No:5579367

Multi-medium closed-loop controlled satellite broadcast network for simple end-user operation

No:6112249

Non-disruptively rerouting network communications from a secondary network path to a primary path

No:6246748

Power feeding system using two-wire subscriber lines

No:5857010

Power-failure resistant communication system

No:3001027

Private line transfer switching circuit

No:5602828

Protect path switching in a performance monitoring and test system

No:5390231

Protection and recovery of telephone line interface circuits

No:5479396

Redundant system having signal path operation function

No:3958111

Remote diagnostic apparatus

No:4718079

Remote unit monitoring system

No:5604785

Remotely actuated switch and protection circuit

No:5887050

Repeater apparatus having isolation circuit

No:6278769

Signaling method for invoking a test mode in a network interface unit

No:5751789

Snid with wireless backup

No:6519320

State monitoring method and apparatus in subscriber line test

No:4575842

Survivable local area network

No:5818926

Switching device for telecommunications channel

No:4477895

Synchronized protection switching arrangement