Patent ID: 6026076
Filing Date: 2000-02-15
Classification: H04J

Abstract:
In a digital switching system for switching tiered multiplexed incoming pulse code modulation (PCM) signals to tiered multiplexed outgoing PCM signals, each for carrying a plurality of multiplexed PCM signals, said system comprising tiered demultiplexing apparatus for demultiplexing an incoming tiered PCM signal into a plurality of multiplexed PCM incoming signals, apparatus, external to said demultiplexing apparatus, for checking for proper operation of said demultiplexing apparatus, comprising:means for converting a tiered multiplexed incoming PCM signal into a plurality of multiplexed PCM signals;means for selecting one of said plurality of multiplexed PCM signals in said means for converting;means for selecting a corresponding one multiplexed incoming signal from said demultiplexing apparatus; andmeans for matching said one of said plurality of multiplexed PCM signals of said means for converting with said corresponding multiplexed incoming signal of said demultiplexing apparatus.