Communications system and method for testing of a communications apparatus

A method of testing, under operational load conditions, a telephone communications apparatus which contains a plurality of telephones (T1-Tn), particularly mobile telephones, a plurality of electrical connection lines and at least one transmission station (UEV) for transmitting signals in said telephone communication apparatus (KV), comprising the steps:

• generating and executing test instructions with a programmable data processing apparatus (S) of a central signal processing apparatus (ZV) for testing said telephone communication apparatus (KV);
• transmitting digital test signals generated according to test commands to a converter apparatus (WV) and converting said digital test signals into operating signals for systematically interrupting at least one electrical connection line of said plurality of electrical connection lines;
• transmitting said operating signals from said converter apparatus (WV) to an interrupt apparatus (UV) and operationally controlling said interrupt apparatus (UV) according to said operating signals to interrupt at least one electrical connection line for time intervals predetermined by said operating signals,
• comparing actual signal changes produced on account of said systematic interruptions with associated reference signal changes and
• signaling deviations of said actual signal changes from said reference signal changes.

A method of testing, under operational load conditions, a telephone communications apparatus which contains a plurality of telephones (T1-Tn), particularly mobile telephones, a plurality of electrical connection lines and at least one transmission station (UEV) for transmitting signals in said telephone communication apparatus (KV), comprising the steps:

• generating and executing test instructions with a programmable data processing apparatus (S) of a central signal processing apparatus (ZV) for testing said telephone communication apparatus (KV);
• transmitting digital test signals generated according to test commands to a converter apparatus (WV) and converting said digital test signals into operating signals for systematically interrupting at least one electrical connection line of said plurality of electrical connection lines;
• transmitting said operating signals from said converter apparatus (WV) to an interrupt apparatus (UV) and operationally controlling said interrupt apparatus (UV) according to said operating signals to interrupt at least one electrical connection line for time intervals predetermined by said operating signals,
• comparing actual signal changes produced on account of said systematic interruptions with associated reference signal changes;
• signaling deviations of said actual signal changes from said reference signal changes;
• setting up a voice channel between each pair of telephones of a plurality of telephones (T1 to Tn) in a call involving two parties or a conference call involving three or more participants;
• on the basis of a first telephone, repeatedly transmitting with a predetermined frequency via said voice channel a pattern of tone pulses that clearly identifies said first telephone, and
• having a second telephone participating in the call monitor the reception of said first telephone's pattern of tone pulses transmitted via said voice channel;
• wherein the transmission of said pattern of tone pulses between said first and second telephones includes voice compression and voice decompression;
• and
• said pattern of tone pulses being selected such that an identification of said first telephone is possible when said pattern of tone pulses is received at said second telephone if voice compression and voice decompression are used.