US3796835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching system for tdm data which induces an asynchronous submultiplex channel
Assignee: International Business Machines Corp
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Filing: 1971-09-03
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Granted: 1974-03-12
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Expires: 1991-09-03
Abstract
Abstract A TDM multiplex communications system for effectively transmitting voice, or high speed, and signalling information or low speed data, between a plurality of stations by employing an asynchronous sub-multiplex channel for the low speed data transmission. The sub-multiplex channel comprises one or more time slots of the equally divided time slot intervals of the normal multiplexing time frame, and is available for use by any connected station of the incoming highways to the central switch, having signaling information or low speed data ready for transmission. Each of the connected stations of the incoming highways having voice or high speed data is assigned, for synchronous operation, particular ones of the remaining time slots, in cyclic fashion, within the multiplexing time frame. Since the submultiplex channel is arranged so that the sending or receiving station address is carried beside the data to be transmitted, any data rate is acceptable thereby.
Inventors
- 👤 D Wild
- 👤 E Port
- 👤 H Rudin
- 👤 F Closs
- 👤 H Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:25
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/16; H04J3/1605; H04J3/1623; H04J3/1647; H04J3/02; H04J3/12; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/427; H04L12/43; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
446 words
A communication switching device for controlling and switching both high speed and low speed data between a plurality of incoming and outgoing highways, each of said highways comprising a plurality of stations connected to said switching device and arranged to transmit data in time frames divided into time slots with the low speed data ready for transmission from any of said connected stations having available for asynchronous occupancy with its associated address information at least one designated time slot assigned to low speed data transmission so as to form asynchronous sub-multiplex channel therefor and with the high speed data from said connected stations occupying the remainder of said time slots of said time frames in accordance with the assignment of designated time slots to particular stations so as to form a synchronous multiplex channel therefor, said switching device including: scanning means to scan every incoming highway during each time slot of each time frame to obtain the information received therein; selection means coupled to said scanning means for selecting information including said address information and said low speed data received during time slots assigned to said submultiplex channel during each time frame; intermediate storage means coupled to said selection means for storing any sending station address information received on said sub-multiplex channel during each time frame; control means responsive to the said information received on said sub-multiplex channel for determining whether the said low speed data received over said sub-multiplex channel is signaling information or data to be sent to another station; address storage means coupled to said intermediate storage means and to said control means and having stored therein an assignment list which identifies the address relationship between respective pairs of sending and receiving stations which are connected over said sub-multiplex channel, said address storage means being responsive to the said sending station address stored in said intermediate storage means and to said control means to produce at its output the address of the receiving station to which said sending station is connected; and outgoing highway selection and control means coupled to each of said address storage means, said selection means and said control means and responsive to select the appropriate one of outgoing highways in accordance with the respective receiving station addrEsses received from said address storage means, said receiving station addresses corresponding to the receiving stations identified by said assignment list as the one to which respective ones of said sending stations is connected, said outgoing highway selection and control means acting to store said receiving station addresses and the associated said low speed data to be sent therewith to said receiving stations as received from said selection means and said control means.
Claim 2
Dependent Claim
446 words
A communication switching device for controlling and switching both high speed and low speed data between a plurality of incoming and outgoing highways, each of said highways comprising a plurality of stations connected to said switching device and arranged to transmit data in time frames divided into time slots with the low speed data ready for transmission from any of said connected stations having available for asynchronous occupancy with its associated address information at least one designated time slot assigned to low speed data transmission so as to form asynchronous sub-multiplex channel therefor and with the high speed data from said connected stations occupying the remainder of said time slots of said time frames in accordance with the assignment of designated time slots to particular stations so as to form a synchronous multiplex channel therefor, said switching device including: scanning means to scan every incoming highway during each time slot of each time frame to obtain the information received therein; selection means coupled to said scanning means for selecting information including said address information and said low speed data received during time slots assigned to said submultiplex channel during each time frame; intermediate storage means coupled to said selection means for storing any sending station address information received on said sub-multiplex channel during each time frame; control means responsive to the said information received on said sub-multiplex channel for determining whether the said low speed data received over said sub-multiplex channel is signaling information or data to be sent to another station; address storage means coupled to said intermediate storage means and to said control means and having stored therein an assignment list which identifies the address relationship between respective pairs of sending and receiving stations which are connected over said sub-multiplex channel, said address storage means being responsive to the said sending station address stored in said intermediate storage means and to said control means to produce at its output the address of the receiving station to which said sending station is connected; and outgoing highway selection and control means coupled to each of said address storage means, said selection means and said control means and responsive to select the appropriate one of outgoing highways in accordance with the respective receiving station addrEsses received from said address storage means, said receiving station addresses corresponding to the receiving stations identified by said assignment list as the one to which respective ones of said sending stations is connected, said outgoing highway selection and control means acting to store said receiving station addresses and the associated said low speed data to be sent therewith to said receiving stations as received from said selection means and said control means.
Claim 3
Dependent Claim
432 words
A communicatin switching device for controlling and switching both high speed and low speed data between a plurality of incoming and outgoing highways, each of said highways comprising a plurality of stations connected to said switching device and arranged to transmit data in time frames divided into time slots with the low speed data ready for transmission from any of said connected stations havng available for asynchronous occupancy with its associated address information at least one designated time slot assigned to low speed data transmision so as to form an asynchronous sub-multiplex channel therefor and with the high speed data from said connected stations occupying the remainder of said time slots of said time frames in accordance with the assignment of designated time slots to particular stations so as to form a synchronous multiplex channel therefor, said switching device including; scanning means to scan each incoming highway during each time slot of each time frame to obtain the information received therein; separating means coupled to said scanning means for separating information including separating said low speed data and associated sending station address information received during time slots assigned to said asynchronous sub-multiplex channel during each frame from the said high speed data received during time slots assigned to said asynchronous multiplex channel during each time frame; address storage and control means coupled to said separating means and having stored therein an assignment list which identifies the address relationship between respective pairs of sending and receiving stations which are connected over said sub-multiplex channel, said address storage and control means being responsive to the respective said sending station address information separated by said separating means to produce at its output information as to the addresses of the respective receiving stations to which said sending stations are connected; and outgoing highway selection and control means coupled to both said address storage and control means and said separating means and responsive to select the appropriate outgoing highways in accordance with the said information as to the addresses of the respective receiving stations as received from said address storage and control means, said receiving stations corresponding to the receiving stations identified by said assignment list as the one to which respective ones of said sending stations are connected, said outgoing highway selection and control means acting to store at appropriate outgoing highway storage locations both the said information as to the addresses of said respective receiving stations and the associated said low speed data to be sent therewith as recieved from said separating means, until said storage locations may be read out over said sub-multiplex channel.
Claim 4
Dependent Claim
432 words
A communicatin switching device for controlling and switching both high speed and low speed data between a plurality of incoming and outgoing highways, each of said highways comprising a plurality of stations connected to said switching device and arranged to transmit data in time frames divided into time slots with the low speed data ready for transmission from any of said connected stations havng available for asynchronous occupancy with its associated address information at least one designated time slot assigned to low speed data transmision so as to form an asynchronous sub-multiplex channel therefor and with the high speed data from said connected stations occupying the remainder of said time slots of said time frames in accordance with the assignment of designated time slots to particular stations so as to form a synchronous multiplex channel therefor, said switching device including; scanning means to scan each incoming highway during each time slot of each time frame to obtain the information received therein; separating means coupled to said scanning means for separating information including separating said low speed data and associated sending station address information received during time slots assigned to said asynchronous sub-multiplex channel during each frame from the said high speed data received during time slots assigned to said asynchronous multiplex channel during each time frame; address storage and control means coupled to said separating means and having stored therein an assignment list which identifies the address relationship between respective pairs of sending and receiving stations which are connected over said sub-multiplex channel, said address storage and control means being responsive to the respective said sending station address information separated by said separating means to produce at its output information as to the addresses of the respective receiving stations to which said sending stations are connected; and outgoing highway selection and control means coupled to both said address storage and control means and said separating means and responsive to select the appropriate outgoing highways in accordance with the said information as to the addresses of the respective receiving stations as received from said address storage and control means, said receiving stations corresponding to the receiving stations identified by said assignment list as the one to which respective ones of said sending stations are connected, said outgoing highway selection and control means acting to store at appropriate outgoing highway storage locations both the said information as to the addresses of said respective receiving stations and the associated said low speed data to be sent therewith as recieved from said separating means, until said storage locations may be read out over said sub-multiplex channel.
Claim 5
Independent Claim
395 words
A method of time division multiplexing information over a communications medium between a plurality of sending stations and a plurality of receiving stations, the said information to be transmitted over said communications medium having data of varying speeds including high speed data and varying low speed data with said high speed data transmitted synchronously and said varying low speed data transmitted asynchronously over sequential time frames, said information being transmitted between sending stations and receiving stations by: assigning respective specified time slots within said time frames to each of said sending stations having said high speed data to be tRansmitted to a particular receiving station with the assigned time slots providing a high speed synchronous data channel for said sending stations; commonly assigning at least one specified time slot within each of said time frames to all sending stations having said low speed data to be transmitted, said at least one specified time slot acting to form a low speed asynchronous sub-multiplex data channel available to any of said sending stations having said low speed data to be transmitted; subdividing the said at least one specified time slot of said sub-multiplex data channel into at least two parts so that one part thereof is reserved for the transmission of an address for assigning as needed on a frame by frame basis said sub-multiplex data channel to any one of said sending stations having said low speed data to be transmitted and so that another part thereof is reserved for the transmission of the low speed data of the particular one of said sending stations whose address occupies said one part; said information to be transmitted from said sending stations to said receiving stations by: scanning each of said sending stations during each of said time frames; selecting from the scanned information the information from sending stations transmitted over said high speed synchronous channel; determining the respective receiving station addresses for the information scanned from said synchronous channel on the basis of the known assigned time slots of the sending stations; selecting from the scanned information the information from sending stations including sending station addresses transmitted over said low speed asynchronous sub-multiplex channel; and determining the respective receiving station addresses for the information scanned from said asynchronous sub-multiplex channel on the basis of the known addresses of the sending stations as selected from said scanned information.
Claim 6
Independent Claim
395 words
A method of time division multiplexing information over a communications medium between a plurality of sending stations and a plurality of receiving stations, the said information to be transmitted over said communications medium having data of varying speeds including high speed data and varying low speed data with said high speed data transmitted synchronously and said varying low speed data transmitted asynchronously over sequential time frames, said information being transmitted between sending stations and receiving stations by: assigning respective specified time slots within said time frames to each of said sending stations having said high speed data to be tRansmitted to a particular receiving station with the assigned time slots providing a high speed synchronous data channel for said sending stations; commonly assigning at least one specified time slot within each of said time frames to all sending stations having said low speed data to be transmitted, said at least one specified time slot acting to form a low speed asynchronous sub-multiplex data channel available to any of said sending stations having said low speed data to be transmitted; subdividing the said at least one specified time slot of said sub-multiplex data channel into at least two parts so that one part thereof is reserved for the transmission of an address for assigning as needed on a frame by frame basis said sub-multiplex data channel to any one of said sending stations having said low speed data to be transmitted and so that another part thereof is reserved for the transmission of the low speed data of the particular one of said sending stations whose address occupies said one part; said information to be transmitted from said sending stations to said receiving stations by: scanning each of said sending stations during each of said time frames; selecting from the scanned information the information from sending stations transmitted over said high speed synchronous channel; determining the respective receiving station addresses for the information scanned from said synchronous channel on the basis of the known assigned time slots of the sending stations; selecting from the scanned information the information from sending stations including sending station addresses transmitted over said low speed asynchronous sub-multiplex channel; and determining the respective receiving station addresses for the information scanned from said asynchronous sub-multiplex channel on the basis of the known addresses of the sending stations as selected from said scanned information.
Claim 7
Dependent Claim
51 words
The method as set forth in claim 3 wherein in subdividing the said specified time slot of said sub-multiplex data channel into at least two parts, a part therefrom is provided at the beginning thereof for indicating the status of the sub-multiplex data channel as between its free and busy states.
Claim 8
Dependent Claim
89 words
The method as set forth in claim 4 wherein said plurality of sending stations and said plurality of receiving stations are each divided into groups with each station in each of said groups sending or receiving high speed data being assigned one of the said respective specified time slots of said high speed synchronous data channel and with each station in each of said groups sending or receiving low speed data being commonly assigned said at least one specified time slot in said low speed asynchronous sub-multiplex data channel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |