Battery feed circuit for a telephone system
Battery feed circuit for subscriber line
Battery feed circuit for supplying feed current to telephone...
Battery feed circuit for telephone subscriber line
Battery feed for telephone line cards
Battery powered in-line amplifier
Battery-feed circuit for exchange
Batteryless data receiver having power supply isolation...
Baud-rate-independent asvd transmission built around g.729...
Bell signal generating circuit
Bell system and/or multiple door intercom system
Bi-directional buffer line amplifier
Bidding for telecommunications traffic
Bidding for telecommunications traffic over route segments
Bidirectional data transfer and storage system
Bidirectional point to multipoint network using multicarrier...
Bilateral voice-signal controller for use in the two-wire...
Bill image generation
Bill processing system
Billing arrangements for communication call segments having...