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4201891 |
Expandable digital switching network
A distributed control digital switching network is configured as a group switch having a plurality of stages of multiport single sided switching elements for selectively interconnecting a plurality...
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4154982 |
Switching network for establishing two-way connections between selected subscribers and an automatic exchange in a PCM telephone system
A switching network with k=p+q inputs and as many outputs comprises one or more symmetrical time-division matrices, k being eight or a multiple of eight in the embodiments specifically disclosed. A...
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4136263 |
Telephone system having space divided speech channels and a separate time divided data highway
A telephone intercommunications system has speech channels to which the telephone stations of the system can be selectively linked, a plurality of data channels in time-division multiplex to which...
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4125747 |
Telephone switching circuit
The present invention relates to telephony switching circuits which are used in electronic automatic exchanges operating on the time-division multiplex system known as PCM. According to the...
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4097693 |
Switching system for an automatic telecommunication exchange with a plurality of intermediate lines that are grounded when not in use
Switching system for an automatic telecommunication exchange with space- and time division multiplex. A two-stage switching network is described which, from the traffic-technical point of view is...
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4092497 |
Connection network for PCM TDM automatic telephone exchange equipment
A pulse code modulation (PCM) time division multiplex (TDM) automatic telephone exchange, comprising a series-to-parallel converter having incoming multiplex channel inputs and outputs,...
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4022979 |
Automatic in-service digital trunk checking circuit and method
The integrity of switched, time-division multiplexed digital trunks in a telephone switching system is verified on an individual and in-service basis wherein the digital check is accomplished...
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4009346 |
Distributional activity compression
Modular digital exchange terminals linked in a network by earth satellite provide coordinated multiplex switching and activity compression between line circuits and satellite time division...
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3941947 |
Connection unit for time division switching system
Connection unit for linking subscribers to an exchange in a time switching system comprising at least a space-time concentrator consisting essentially of a subscribers' connection circuit, a...
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3906161 |
Method for switching pulse code modulated signals using time-division multiplex principles
A method is described for effecting the connection of time division multiplex trunks. Through-connecting units are used which cause time channel conversion and spatial through-connection. These...
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3890469 |
Time division switching system
A plurality of 24-channel, 8-bit time division multiplex carrier lines are inserted with coding data in each channels thereof to identify the PCM data being transmitted. A first multiplexer unit...
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3840707 |
INTERMEDIATE EXCHANGE FOR DIGITAL SIGNALS, FOR CONNECTION OF ONE OF A NUMBER OF INLETS TO A SPECIFIC OUTLET OF A NUMBER OF OUTLETS
An intermediate exchange for digital signals, especially PCM-signals has a number of inlets (incoming links) and an equal number of outlets (outgoing links) which are time- and space-divided. For...
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3743785 |
TELECOMMUNICATION SWITCHING SYSTEM EMPLOYING TIME DIVISION MULTIPLEX CONNECTIONS
In a TDM-exchange involving space-division to time-division conversion lowpass filters associated with the space division transmission channels, as well as the subscriber line circuits, are...
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3743789 |
BUSY BIT FOR TIME DIVISION MULTIPLEX SIGNALS TO REDUCE SIGNAL PROCESSING TIME
A predetermined bit location in each time slot word of a time division multiplex signal is reserved for including a signal bit which indicates by its signal state whether or not that particular...
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3585306 |
TANDEM OFFICE TIME DIVISION SWITCHING SYSTEM
A tandem office switching system is disclosed which will accommodate both digital and analog signals transmitted in single or multiplexed message form. A space division system switches analog...
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3558823 |
TANDEM OFFICE SWITCHING SYSTEM
A telephone tandem office switching system accommodating information received in multiplexed digital form is disclosed. A combination time and space division network employing two signal...
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3499120 |
TIME MULTIPLEX COMMUNICATION EXCHANGE WITH STORAGE DEVICE OF INCREASED CAPACITY
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3478171 |
TIME-DIVISION TELEPHONE EXCHANGE SYSTEM HAVING A VARIABLY SPACED REPETITIVE SAMPLING RATE
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3458658 |
NONBLOCKING SWITCHING SYSTEM WITH REDUCED NUMBER OF CONTACTS
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3424868 |
COMBINED TIME DIVISION AND SPACE DIVISION SWITCHING SYSTEM USING PULSE CODED SIGNALS
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