Pcm network synchronization

Claim 2

In combination, a transmitting terminal, a common timedivided transmission facility, and a receiving terminal, a plurality of n asynchronous pulse sources whose pulse trains are to be multiplexed on said common time-divided pulse transmission facility, means at said transmitting terminal for converting the pulse repetition rate of each of said pulse trains to a common lower pulse repetition rate by the deletion of signals from said pulse trains, means at said transmitting terminal for multiplexing said converted pulse trains on said common timedivided transmission facility, means at said transmitting terminal for generating a first predetermined code word to establish a time reference, means at said transmitting terminal for generating a second predetermined code word composed of n portions each portion being allocated to a predetermined one of said pulse sources to indicate when an output signal has been deleted from a pulse train, means for generating a third predetermined code word composed of n portions each portion being allocated to a predetermined one of said pulse sources to indicate the nature of the signal deleted from the output of a pulse source, means for transmitting each bit of said code words in a predetermined portion of the transmission space of said transmission facility, means to repeat the transmission in said predetermined Portion of the transmission space of said first code word prior to the transmission of said second and third code words to reestablish said time reference and to determine that a pulse signal has been deleted from the output of a pulse source and the nature of the signal deleted, means at the receiving terminal for demultiplexing the transmitted signals, means at the receiving terminal to recreate said time reference in response to the reception of said first code words, and means at said receiving terminal responsive to said time references generated at said receiving terminal and the reception of said second and third code words for inserting deleted pulse signals into the demultiplexed signals.

Claim 3

In combination, a transmitting terminal, a common time-divided transmission facility, and a receiving terminal, a plurality of n asynchronous pulse sources whose pulse trains are to be multiplexed on said common time divided pulse transmission facility, means at the transmitting terminal for converting the pulse repetition rate of those pulse trains whose repetition rates are less than the repetition rate of the transmission space allocated for their transmission to a common higher repetition rate by the insertion of control signals into each such pulse train, means at the transmitting terminal of said transmission facility for converting the pulse repetition rate of each of said pulse trains whose repetition rate is greater than the repetition rate of the transmission space allocated for the transmission of that pulse train to a common lower pulse repetition rate by the deletion of signals from those said pulse trains, means at the transmitting terminal for multiplexing said converted pulse trains on said common time-divided transmission facility, means at the transmitting terminal of said facility for generating a first predetermined code word to establish a time reference, means for generating a second predetermined code word composed of n portions each portion being allocated to a predetermined one of said pulse sources to indicate the presence of an inserted control signal in the pulse train from any of said pulse sources, means for generating a third predetermined code word composed of n portions each portion being allocated to one of said pulse sources to indicate when an predetermined signal has been deleted space of said first code word prior to the transmission of said pulse train, means for generating a fourth predetermined code word composed of n portions each portion being allocated to a predetermined one of said pulse sources to indicate the nature of the signal deleted from the output of a pulse source, means for transmitting each bit of said code words in a predetermined portion of said common time-divided pulse transmission facility, means to repeat the transmission in said predetermined portion of the transmission space of said first code word prior to the transmission of said second, third and fourth code words to reestablish said time reference and determine that a control signal has been added to the output of a pulse source and to determine that a pulse signal has been deleted from the output of a pulse transmitter and the nature of the signal deleted, means at said receiving terminal for demultiplexing the transmitted signals, means at said receiving terminal to recreate said time reference in response to the reception of said first code words, means at said receiving terminal responsive to said time reference generated at said receiving terminal and the reception of said second generated code words for removing inserted control signals from the demultiplexed signals, and means at said receiving terminal responsive to said time reference generated at said receiving terminal and the reception of said third and fourth code words for inserting deleted pulse signals into the demultiplexed signals.

Claim 4

In combination, a transmitting terminal, a common time-divided transmission facility, and a receiving terminal, a plurality of n asynchronous pulse sources whose pulse trains are to be multiplexed on said common time divided pulse transmission facility, means at the transmitting terminal for converting the pulse repetition rate of those pulse trains whose repetition rates are less than the repetition rate of the transmission space allocated for their transmission to a common higher repetition rate by the insertion of control signals into each such pulse train, means at the transmitting terminal of said transmission facility for converting the pulse repetition rate of each of said pulse trains whose repetition rate is greater than the repetition rate of the transmission space allocated for the transmission of that pulse train to a common lower pulse repetition rate by the deletion of signals from those said pulse trains, means at the transmitting terminal for multiplexing said converted pulse trains on said common time-divided transmission facility, means at the transmitting terminal of said facility for generating a first predetermined code word to establish a time reference, means for generating a second predetermined code word composed of n portions each portion being allocated to a predetermined one of said pulse sources to indicate the presence of an inserted control signal in the pulse train from any of said pulse sources, means for generating a third predetermined code word composed of n portions each portion being allocated to one of said pulse sources to indicate when an predetermined signal has been deleted space of said first code word prior to the transmission of said pulse train, means for generating a fourth predetermined code word composed of n portions each portion being allocated to a predetermined one of said pulse sources to indicate the nature of the signal deleted from the output of a pulse source, means for transmitting each bit of said code words in a predetermined portion of said common time-divided pulse transmission facility, means to repeat the transmission in said predetermined portion of the transmission space of said first code word prior to the transmission of said second, third and fourth code words to reestablish said time reference and determine that a control signal has been added to the output of a pulse source and to determine that a pulse signal has been deleted from the output of a pulse transmitter and the nature of the signal deleted, means at said receiving terminal for demultiplexing the transmitted signals, means at said receiving terminal to recreate said time reference in response to the reception of said first code words, means at said receiving terminal responsive to said time reference generated at said receiving terminal and the reception of said second generated code words for removing inserted control signals from the demultiplexed signals, and means at said receiving terminal responsive to said time reference generated at said receiving terminal and the reception of said third and fourth code words for inserting deleted pulse signals into the demultiplexed signals.

Claim 5

In combination, a transmitting terminal, a common time-divided transmission facility whose transmission space is divided into frames, and a receiving terminal, a plurality of asynchronous pulse source whose output pulse trains are to be multiplexed on said common time-divided pulse transmission facility, means at the transmitting terminal for converting the pulse repetition rate of those pulse trains whose repetition rates are greater than the repetition rate of the transmission space allocated for the transmission of that pulse train to a common lower pulse repetition rate by the deletion of signals from those said pulse trains, means at said transmitting terminal for multiplexing said converted pulse trains on said common time-divided transmission facility, means at the transmitting terminal of said facility for generating a first predetermined code word to establish a time reference comprising, a shift register having at least S stages where S is the number of time slots in said first predetermined code word, means to insert a marking pulse in the first stage of said shift register and a space in all other stages, means to shift said marking pulse through said shift register under the control of a signal generated during a predetermined time slot of said transmission frame in which said code signals are transmitted, an OR gate connected to the output terminals of selected stages of said shift register so that the signal appearing at the output terminal of said OR gate constitutes said first code word, and AND gate connected to receive the output of said OR gate, a divide-by-four circuit having a plurality of output terminals and an input terminal connected to receive an input signal from the output of one of the stages of said shift register, the output signal from a first output terminal of said divide-by-four circuit indicating that the time of occurrence of first said code word is present, means to enable said AND gate with said output signal from said first output terminal of said divide-by-four circuit, a second OR gate connected to receive the output of said AND gate, and a second AND gate the output terminal of said second OR gate being connected to one input terminal of said second AND gate which is enabled by a signal applied to a second input terminal during each predetermined time slot of said transmission frame during which a code bit is transmitted, and whose output terminal is connected to said transmission facility, means for generating a second predetermined code word to indicate when an output signal has been deleted from a pulse train, means for generating a third predetermined code word to indicate the nature of the signal deleted from the output of a pulse source, means for transmitting each bit of said code words in a predetermined portion of said common time-divided pulse transmission facility, means at said receiving terminal of said transmission facility for demultiplexing the transmitted signals, means at said receiving terminal to create a time reference in response to the reception of said first code word, and means at said receiving terminal responsive to said time reference generated at said receiving terminal and the reception of said second and third code words for inserting deleted pulse signals into the demultiplexed signals.

Claim 6

In combination, a transmitting terminal, a common time-divided transmission facility whose transmission space is divided into frames, and a receiving terminal, a plurality of asynchronous pulse source whose output pulse trains are to be multiplexed on said common time-divided pulse transmission facility, means at the transmitting terminal for converting the pulse repetition rate of those pulse trains whose repetition rates are greater than the repetition rate of the transmission space allocated for the transmission of that pulse train to a common lower pulse repetition rate by the deletion of signals from those said pulse trains, means at said transmitting terminal for multiplexing said converted pulse trains on said common time-divided transmission facility, means at the transmitting terminal of said facility for generating a first predetermined code word to establish a time reference comprising, a shift register having at least S stages where S is the number of time slots in said first predetermined code word, means to insert a marking pulse in the first stage of said shift register and a space in all other stages, means to shift said marking pulse through said shift register under the control of a signal generated during a predetermined time slot of said transmission frame in which said code signals are transmitted, an OR gate connected to the output terminals of selected stages of said shift register so that the signal appearing at the output terminal of said OR gate constitutes said first code word, and AND gate connected to receive the output of said OR gate, a divide-by-four circuit having a plurality of output terminals and an input terminal connected to receive an input signal from the output of one of the stages of said shift register, the output signal from a first output terminal of said divide-by-four circuit indicating that the time of occurrence of first said code word is present, means to enable said AND gate with said output signal from said first output terminal of said divide-by-four circuit, a second OR gate connected to receive the output of said AND gate, and a second AND gate the output terminal of said second OR gate being connected to one input terminal of said second AND gate which is enabled by a signal applied to a second input terminal during each predetermined time slot of said transmission frame during which a code bit is transmitted, and whose output terminal is connected to said transmission facility, means for generating a second predetermined code word to indicate when an output signal has been deleted from a pulse train, means for generating a third predetermined code word to indicate the nature of the signal deleted from the output of a pulse source, means for transmitting each bit of said code words in a predetermined portion of said common time-divided pulse transmission facility, means at said receiving terminal of said transmission facility for demultiplexing the transmitted signals, means at said receiving terminal to create a time reference in response to the reception of said first code word, and means at said receiving terminal responsive to said time reference generated at said receiving terminal and the reception of said second and third code words for inserting deleted pulse signals into the demultiplexed signals.

Claim 7

In combination, a transmitting terminal, a common time-divided transmission facility and a receiving terminal, a plurality of asynchronous pulse sources whose output pulse trains are to be multiplexed on said common time-divided transmission facility, means at said transmitting terminal for converting the pulse repetition rate of each of said pulse trains whose pulse repetition rate is greater than the repetition rate of the transmission space allocated for he transmission of that pulse train to a common lower pulse repetition rate by the deletion of signals from those said pulse trains, means at said transmitting terminal for multiplexing said converted pulse trains on said common time-divided transmission facility, means at said transmitting terminal for generating a first predetermined code word to establish a time refereNce, means for generating a second predetermined code word to indicate when an output signal has been deleted from a pulse train, means for generating a third predetermined code word to indicate the nature of the signal deleted from the output of a pulse source, means for transmitting each bit of said code words in a predetermined portion of said common time-divided pulse transmission facility, wherein said means at the transmitting terminal for converting the pulse repetition rate of said pulse trains to a common lower pulse repetition rate by the deletion of signals and said means for generating said second and third predetermined code word comprises in combination, an elastic store having a pulse input terminal, a pulse output terminal, and a phase output terminal a at which a voltage is generated indicative of the occupancy of said store, means for periodically reading pulse signals out of said store, means for applying one of said asynchronous pulse trains to the pulse input terminal of said store, comparison means connected to the phase output terminal of said store to generate an output signal when the occupancy of said store falls below a predetermined value, means for periodically examining the output signal from said comparison means at a predetermined examining time and generating an output signal from a first AND gate when the occupancy of said store has fallen below a predetermined value at that time, a bistable circuit connected to receive the output signal from said first AND gate to generate a reference signal indicative of the fact that a signal is to be deleted from the output signal of said elastic store, gating means connected to receive the output signal from said bistable circuit to generate a signal to read out a pulse signal from said elastic store without transmitting it on said transmission facility, a second AND gate which is enabled by the output voltage from said bistable circuit during the time allocated to the occurrence of said second code word to generate said second predetermined code word indicative of the fact that a signal has been deleted from a pulse train, a second bistable circuit connected to receive the signal readout of said elastic store and not transmitted on said transmission facility, a third AND gate responsive to the output signal from said second bistable circuit to generate said third predetermined code word indicative of the nature of the signal deleted during the time allocated to the occurrence of said third code word, means at said receiving terminal of said transmission facility for demultiplexing the transmitted signals, means at said receiving terminal to create a time reference in response to the reception of said first code word, and means at said receiving terminal responsive to said time reference generated at said receiving terminal and the reception of said second and third code words for inserting deleted pulse signals into the demultiplexed signals.

Claim 8

In combination, a transmitting terminal, a common time-divided transmission facility and a receiving terminal, a plurality of asynchronous pulse sources whose output pulse trains are to be multiplexed on said common time-divided transmission facility, means at said transmitting terminal for converting the pulse repetition rate of each of said pulse trains whose pulse repetition rate is greater than the repetition rate of the transmission space allocated for he transmission of that pulse train to a common lower pulse repetition rate by the deletion of signals from those said pulse trains, means at said transmitting terminal for multiplexing said converted pulse trains on said common time-divided transmission facility, means at said transmitting terminal for generating a first predetermined code word to establish a time refereNce, means for generating a second predetermined code word to indicate when an output signal has been deleted from a pulse train, means for generating a third predetermined code word to indicate the nature of the signal deleted from the output of a pulse source, means for transmitting each bit of said code words in a predetermined portion of said common time-divided pulse transmission facility, wherein said means at the transmitting terminal for converting the pulse repetition rate of said pulse trains to a common lower pulse repetition rate by the deletion of signals and said means for generating said second and third predetermined code word comprises in combination, an elastic store having a pulse input terminal, a pulse output terminal, and a phase output terminal a at which a voltage is generated indicative of the occupancy of said store, means for periodically reading pulse signals out of said store, means for applying one of said asynchronous pulse trains to the pulse input terminal of said store, comparison means connected to the phase output terminal of said store to generate an output signal when the occupancy of said store falls below a predetermined value, means for periodically examining the output signal from said comparison means at a predetermined examining time and generating an output signal from a first AND gate when the occupancy of said store has fallen below a predetermined value at that time, a bistable circuit connected to receive the output signal from said first AND gate to generate a reference signal indicative of the fact that a signal is to be deleted from the output signal of said elastic store, gating means connected to receive the output signal from said bistable circuit to generate a signal to read out a pulse signal from said elastic store without transmitting it on said transmission facility, a second AND gate which is enabled by the output voltage from said bistable circuit during the time allocated to the occurrence of said second code word to generate said second predetermined code word indicative of the fact that a signal has been deleted from a pulse train, a second bistable circuit connected to receive the signal readout of said elastic store and not transmitted on said transmission facility, a third AND gate responsive to the output signal from said second bistable circuit to generate said third predetermined code word indicative of the nature of the signal deleted during the time allocated to the occurrence of said third code word, means at said receiving terminal of said transmission facility for demultiplexing the transmitted signals, means at said receiving terminal to create a time reference in response to the reception of said first code word, and means at said receiving terminal responsive to said time reference generated at said receiving terminal and the reception of said second and third code words for inserting deleted pulse signals into the demultiplexed signals.

Claim 9

In combination, a transmitting terminal, a common time-divided transmission facility and a receiving terminal, a plurality of asynchronous pulse sources whose output pulse trains are to be multiplexed on said common time-divided transmission facility, means at said transmitting terminal for converting the pulse repetition rate of those pulse trains whose repetition rates are greater than the pulse repetition rate of the transmission space allocated for their transmission to a common lower pulse repetition rate by the deletion of signals from those said pulse trains, means at said transmitting terminal for multiplexing said converted pulse trains on said common time-divided transmission facility, means at the transmitting terminal of said facility for generating a first predetermined code word to establish a time reference, means for generating a second predetermined code word to indicate when an output signal has been deleted from a pulse train, means for generating a third predetermined code word to indicate the nature of the signal deleted from the outpuT of a pulse transmitter, means for transmitting each bit of said first, second, and third code words in a predetermined portion of said common time-divided pulse transmission facility, means at said receiving terminal of said transmission facility for demultiplexing the transmitted signals, means at said receiving terminal to create a time reference in response to the reception of said first code word comprising, a shift register having an input terminal and at least S stages where S is the number of bits in said first predetermined code word, means to apply said signals transmitted in said predetermined portion of said transmission facility allocated to the transmission of said codes to said input terminal of said shift register, means to shift said shift register in response to each such received predetermined bit, detector means to detect the presence of said first predetermined code word in said shift register, means responsive to said detector means to insert a timing mark in said first stage of said shift register upon the occurrence of said first predetermined bit, and means at said receiving terminal responsive to said time reference generated at said receiving terminal and the reception of said second and third generated code words for inserting signals deleted from the demultiplexed signals at the transmitting terminal.

Claim 10

In combination, a transmitting terminal, a common time-divided transmission facility and a receiving terminal, a plurality of asynchronous pulse sources whose output pulse trains are to be multiplexed on said common time-divided transmission facility, means at said transmitting terminal for converting the pulse repetition rate of those pulse trains whose repetition rates are greater than the pulse repetition rate of the transmission space allocated for their transmission to a common lower pulse repetition rate by the deletion of signals from those said pulse trains, means at said transmitting terminal for multiplexing said converted pulse trains on said common time-divided transmission facility, means at the transmitting terminal of said facility for generating a first predetermined code word to establish a time reference, means for generating a second predetermined code word to indicate when an output signal has been deleted from a pulse train, means for generating a third predetermined code word to indicate the nature of the signal deleted from the outpuT of a pulse transmitter, means for transmitting each bit of said first, second, and third code words in a predetermined portion of said common time-divided pulse transmission facility, means at said receiving terminal of said transmission facility for demultiplexing the transmitted signals, means at said receiving terminal to create a time reference in response to the reception of said first code word comprising, a shift register having an input terminal and at least S stages where S is the number of bits in said first predetermined code word, means to apply said signals transmitted in said predetermined portion of said transmission facility allocated to the transmission of said codes to said input terminal of said shift register, means to shift said shift register in response to each such received predetermined bit, detector means to detect the presence of said first predetermined code word in said shift register, means responsive to said detector means to insert a timing mark in said first stage of said shift register upon the occurrence of said first predetermined bit, and means at said receiving terminal responsive to said time reference generated at said receiving terminal and the reception of said second and third generated code words for inserting signals deleted from the demultiplexed signals at the transmitting terminal.