D channel monitor

D2B divice address initialization by use of default address

Daisy chain multiplexer

Data acquistion and control system

Data and signaling time slot transfer and processing system for

Data and voice communications system

Data base creation in stored program controlled switching system

Data bit synchronizer

Data bus system

Data bus tester for autonomous data communications system

Data capture arrangement for a conference circuit

Data channel scheduling discipline arrangement and method

Data coding method for use in digital communication systems

Data collection and transmission system with real time clock

Data communicating method with capability of full-duplex communi

Data communication apparatus

Data communication apparatus

Data communication apparatus for adjusting frame length and meth

Data communication apparatus having communication-mode changeove

Data communication arrangement with embedded matrix switch