METHOD AND APPARATUS FOR PROVIDING ON-HOOK TRANSMISSION FOR DIGITAL LOOP CARRIER CHANNEL UNITS

摘要

An-hook VF transmission through a channel unit toa subscriber telephone instrument is provided by acontrol unit which generates control signals for thechannel unit. The control unit responds to receipt ofan "idle" code by creating commands which establish aVF path through the channel unit regardless of whetherthe subscriber instrument is on-hook or off-hook.