Integrated digital network (IDN)

• US 4,612,634 A
• Filed: 04/26/1984
• Issued: 09/16/1986
• Est. Priority Date: 04/26/1984
• Status: Expired due to Term

• Current Assignee: General Electric Capital Corporation (General Electric Company)
• Original Assignee: Data General Corp. (Dell Technologies Inc.)
• Inventors: Bellamy, John C.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Rokoff, Kenneth I.
• Application Number:
  US06/604,093
• Time in Patent Office: 873 Days
• Field of Search: 370/58, 370/66, 370/56, 370/99, 370/110.1
• US Class Current: 370/359
• CPC Class Codes: H04L 5/1492 with time compression, e.g. operating according to the ping-pong technique
• CPC Class Codes: H04Q 11/0428 Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals

Abstract

An integrated digital network (IDN) includes a matrix and user signal ports for exchanging voice, data, IDN control, and building control digital signals between the matrix and user equipment, the digital signals comprising single samples of each signal type from each user port in each IDN sample time interval, the IDN further including a transmission system for concentrating user port digital signal samples of each sample time interval, by common signal type, into multiple bit channel signals for exchange between the user ports and matrix signal ports of the matrix switch, the matrix switch interconnecting each channel signal from one or more user ports to one or more other user ports.

Claims

1. An integrated digital network (IDN) for exchanging digital signal information between user signal equipment, comprising:

plurality of station devices, each having a station I/O interface, and each having a plurality of signal port input/output (I/O) interfaces responsive to a cluster of user equipment each signal port I/O exchanging digital signal information with user equipment in signal bit packets of pulse code modulated (PCM) voice, data, and port control bit samples, by receiving an equipment digital signal bit packet from, and transmitting an IDN digital signal bit packet to, the user equipment in each of successive IDN sample periods, said station devices in each sample period multiplexing said equipment signal packet received at each port I/O into a system input signal having a plurality of equipment signal packets at said station I/O interface and demultiplexing the plurality of IDN signal packets of a system output signal received at said station I/O into an IDN signal packet at each port I/O;

call processor means, having a station I/O, for exchanging with said station I/O in each sample period, system input and system output signals comprising a plurality of call control signal bit packets indentifying, by signal port identity, the user signal equipment exchanging information in each sample period;

transmission system means, having a plurality of system I/O interfaces for receiving and sending said system input and system output signals from and to said station I/O interfaces, and having a plurality of matrix I/O interfaces, said transmission system multiplexing said equipment signal packets and said control signal bit packets received in each sample period at two or more system I/O interfaces into a matrix input signal comprising a plurality of serial voice, data, and control signal bit units of common signal type at each matrix I/O, said transmission system means demultiplexing the serial signal bit units of a matrix output signal received at said matrix I/O in each sample period into said control signal bit packets and equipment signal packets to provide said system output signals at two or more system I/Os; and

matrix switch means, having a plurality of switch signal inputs and switch signal outputs, arranged in pairs, one pair for each matrix I/O, said matrix switch means transferring each signal bit unit of each matrix input signal at a switch signal input to those switch signal outputs indentified by said call control signal bits for exchanging information with a switch input in each sample period, whereby each matrix output signal comprises signal bit units from different matrix input signals.

2. The IDN of claim 1, wherein said matrix switch means further comprises:

matrix control means, including a station I/O interface for sending system input signals to and receiving system output signals from said transmission system, a matrix signal processor means responsive to said station I/O, and a matrix time slot interchange (TSI) memory responsive to said matrix signal processor and to said switch signal inputs and said switch signal outputs, said TSI memory transferring, in each sample period in response to instruction signals from said matrix processor, signal bit units stored in a plurality of input address locations thereof associated with said switch signal inputs to a plurality of output address locations thereof associated with said switch signal outputs, said matrix processor providing said instruction signals in responsive to system output signals provided by said transmission system means from said call processor means through said matrix switch means.

3. The IDN of claim 1, wherein:

said station devices each include an auxiliary I/O interface for exchanging an auxiliary (X) signal bit with optional user equipment connected thereto, said station devices receiving an equipment auxiliary signal bit from and sending an IDN auxiliary signal bit to said optional equipment in each sample period, said station devices multiplexing said equipment auxiliary bit sample with said equipment signal packets to provide said system input signal at said station I/O and demultiplexing said IDN auxiliary bit from said system output signal received at said station I/O to said auxiliary I/O; and

wherein

said transmission system means further multiplexes said system input signals to further provide auxiliary signal bit units at each matrix I/O for presentation to said matrix switch means, each auxiliary signal bit unit comprising auxiliary bits from a plurality of staton devices, said transmission system means similarly demultiplexing said auxiliary signal bit units of each matrix output signal into said IDN auxiliary bits for each of a plurality of said system output signals.

4. The IDN of claim 3, wherein:

said IDN sample period frequency is 8.0 KHZ; and

wherein

said station devices each include three signal port I/O interfaces, said equipment and said IDN signal bit packets each including one start (S) bit, one port control (C) bit, eight voice (V) bits, and one extra (E) data bit, to provide an 88 KBPS line rate through each port I/O between each station device and the connected user equipment, said auxiliary I/O interface providing said auxiliary (X) bit at an 8.0 KBPS transmission line rate between said station devices and said optional user equipment, said station devices multiplexing the C, V, and E bits of each equipment packet, together with said X bit and a frame (F) bit, to provide said system input signal at a 256 KBPS line rate at said system I/O.

5. The IDN of claim 4, wherein:

said IDN sample period frequency is 8.0 KHZ; and

wherein

said signal bit units each comprise eight bits, to provide a 64 KBPS signal bit unit line rate to said matrix switch means.

6. The IDN of claim 1, wherein:

said IDN sample period frequency is 8.0 KHZ; and

wherein

said equipment signal bit packets and said IDN signal bit packets each include one start (S) bit, one port control (C) bit, eight voice (V) bits, and one extra (E) data bit, to provide an 88 KBPS line rate between said station device and user equipment connected to each signal port I/O interface.

7. The IDN of claim 1, wherein:

said IDN sample period frequency is 8.0 KHZ; and

wherein

said signal bit units each comprise eight bits, to provide a 64 KBPS signal bit unit line rate to said matrix switch means.

8. The IDN of claim 6, further comprising:

at least one trunk device means, having a station I/O interface for sending and receiving said system input signals and said system output signals to and from said transmission system means, and having a plurality of telephone network I/O interfaces adapted for sending and receiving telephone signal information to and from telephone lines of a public telephone network, said trunk device including signal conversion means for each network I/O for providing, in each IDN sample period, conversion of a sample of the received telephone signal information into the format of said equipment signal bit packet and reconversion of each of said IDN signal bit packets into a return telephone signal information sample to the network, said trunk device means further including signal conditioning means responsive to each of said signal conversion means, for multiplexing each of said equipment signal packet received therefrom in each sample period into a system input signal having a plurality of equipment signal packets at said station I/O interface and demultiplexing the plurality of IDN signal packets of a system output signal received at said station I/O into an IDN signal packet for presentation through each conversion means to the associated network I/O.