Patent US3787627A successfully refreshed from Google Patents.
US3787627A
Expired / Lapsed
US
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Central address distributor
Assignee: Adaptive Technologies Inc
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Filing: 1971-12-15
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Granted: 1974-01-22
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Expires: 1991-12-15
Abstract
Abstract An address-coded communication system is disclosed wherein the size of the address set required in the system is reduced essentially to the maximum number of stations communicating at any time, as contrasted with requiring an address set size equal to the number of stations located in the system. Specifically, a central address distributor is provided which distributes available identifying address codes on the transmission medium in a manner which makes such address codes available to communicating stations for the duration of a link. In one embodiment, a station desiring to go on line makes a bid for an identification address from the central address distributor and by means of a special handshaking technique, the central address distributor assigns an identification address to that user. When such station terminates the call, it returns its assigned address to the central address distributor so that such address can subsequently be re-assigned to another station or user. Special subperiods are assigned within a period for both sending addresses being distributed from the central address distributor, and for returning the addresses from the stations to the central address distributor after use. In another embodiment, the central address distributor continuously polls the stations of the system to determine which addresses are in use at a given time. This is accomplished by generating addresses at the distributor and inserting the addresses, one at a time, into a special polling subperiod which is sent around the entire system. If this address is removed from the transmission line and absorbed by a station or mutilated by the system and therefor not returned to the central address distributor, then it is assumed the address is in use. On the other hand, if this address returns on the line to the central address distributor, this indicates that the address is not in use and, consequently, is placed in a storage register containing available addresses. The available addresses are subsequently sent by the distributor on the line in designated address distributor subperiods from which any station can remove and use an address on a first come basis. In this embodiment, after a station terminates a call and is through using an address, it need not return the address directly to the central address distributor since such distributor is continuously polling the stations to determine which addresses are in use. The central address distributor permits reduction of the size of the address set required, resulting in economizing on system bandwidth and increased system efficiency.
Inventors
- 👤 C Abramson
- 👤 M Nadir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:17
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42; H04L9/00; H04L9/40
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
195 words
An address-coded data communication system wherein communications between stations is carried out by sending station identifying address codes which permit an intended receiving station to distinguish its own intended data from other data carried on a transmission medium for other stations, comprising: a generator for producing a set of station identifying address codes; status means for indicating which of said set of identifying address codes are available and not in use by any of the stations at a given time; distributor means responsive to said generator and said status means for transmitting available identifying address codes on the transmission medium thereby making said address codes available to stations desiring to communicate; assignment means for assigning one or more distribution subperiods located at a predetermined position within repetitive periods (P) of time, said distribution subperiods being used by said distribution means for sending said available identifying address codes on said transmission medium; a distribution subperiod detector at each station and at said distributor means for recognizing said distribution subperiods; and means at each station responsive to said distribution subperiod detector for preempting an available identifying address code for use during communications with one or more stations
Claim 2
Dependent Claim
195 words
An address-coded data communication system wherein communications between stations is carried out by sending station identifying address codes which permit an intended receiving station to distinguish its own intended data from other data carried on a transmission medium for other stations, comprising: a generator for producing a set of station identifying address codes; status means for indicating which of said set of identifying address codes are available and not in use by any of the stations at a given time; distributor means responsive to said generator and said status means for transmitting available identifying address codes on the transmission medium thereby making said address codes available to stations desiring to communicate; assignment means for assigning one or more distribution subperiods located at a predetermined position within repetitive periods (P) of time, said distribution subperiods being used by said distribution means for sending said available identifying address codes on said transmission medium; a distribution subperiod detector at each station and at said distributor means for recognizing said distribution subperiods; and means at each station responsive to said distribution subperiod detector for preempting an available identifying address code for use during communications with one or more stations
Claim 3
Dependent Claim
18 words
System as recited in claim 1, further comprising central storage means for holding said available identifying address codes.
Claim 4
Dependent Claim
57 words
System as recited in claim 2, wherein said status means include further assignment means for assigning a return subperiod within said period (P) for returning said identifying address codes to said central storage means after two or more communicating stations have terminated a communication, whereby said returned identifying address codes can be made available to other stations.
Claim 5
Dependent Claim
48 words
System as recited in claim 3, wherein said further assignment means for returning said identifying address codes to said central storage means includes a return address detector for recognizing in said return subperiod on the transmission medium those identifying address codes being returned by communicating stations after use.
Claim 6
Dependent Claim
60 words
System as recited in claim 1, wherein said status means include polling means employing a polling subperiod assigned within said period (P) for polling the stations of the system as to identifying address codes inserted in said polling subperiod to determine which identifying address codes are available and not in use by any of the stations at any given time.
Claim 7
Dependent Claim
87 words
System as recited in claim 5, wherein said polling means includes poll sending means for sending identifying address codes, produced by said generator, in said polling subperiod on said transmission medium, means for sensing said polling subperiod to determine if said address codes have been removed by stations from said polling subperiods and are in use by said stations, and a poll detector for indicating to said distributor means which of said identifying address codes sent by said poll sending means are available and not in use.
Claim 8
Dependent Claim
44 words
System as recited in claim 1, wherein said distributor means further includes a service request detector for receiving requests by said stations for sending available identifying address codes in said distribution subperiods, said service request detector providing an enable signals to said distributor means.
Claim 9
Dependent Claim
67 words
System as recited in claim 1, further comprising at each of said stations: means responsive to said distribution subperiod detector for receiving an identifying address code from said distribution subperiod on said transmission medium; storage means for storing said distributed identifying address code; and detection means connected to said storage means for recognizing on the transmission medium that identifying address code which is stored by each station.
Claim 10
Dependent Claim
39 words
System as recited in claim 8, further comprising at each of said stations: means for receiving text data conveyed on said transmission medium with said identifying address codes; and text data storage means for storing said received text data.
Claim 11
Dependent Claim
44 words
System as recited in claim 1, further comprising, at each station, clearing means associated with said distribution subperiod detector for removing said available identifying address code from said distribution subperiod on the transmission medium, thereby rendering said removed address code unavailable to other stations.
Claim 12
Dependent Claim
21 words
System as recited in claim 1, wherein said stations are connected on the transmission medium in a closed loop communication system.
Claim 13
Dependent Claim
17 words
System as recited in claim 1, wherein said identifying address codes are represented in binary digit form.
Claim 14
Dependent Claim
240 words
An address-coded data communication system wherein communications between stations is carried out by sending station identifying address code which permit an intended receiving station to distinguish its own intended data from other data carried on a transmission medium for other stations, comprising: a generator for producing a set of station identifying address codes; status means for indicating which of said set of identifying address codes are available and not in use by any of the stations at a given time; central distributor means responsive to said generator and said status means for transmitting available identifying address codes on the transmission medium thereby making said address codes available to stations desiring to communicate; at each station and said central distributor means, timing means for recognizing each of a multiplicity of discrete subperiods located within each period (P) of chronologically repetitive periods (P) of time; assignment means associated with said timing means for assigning one or more of said discrete subperiods as a distribution subperiod located at a predetermined position within said period (P), said distributor subperiod beiNg used by said central distributor means for conveying identifying address codes for use by stations; a distribution subperiod detector, associated with said timing means, at said stations and said central distributor means for recognizing said distribution subperiods; and means at each station responsive to said distribution subperiod detector for preempting an available identifying address code for use during communications with one or more stations.
Claim 15
Dependent Claim
240 words
An address-coded data communication system wherein communications between stations is carried out by sending station identifying address code which permit an intended receiving station to distinguish its own intended data from other data carried on a transmission medium for other stations, comprising: a generator for producing a set of station identifying address codes; status means for indicating which of said set of identifying address codes are available and not in use by any of the stations at a given time; central distributor means responsive to said generator and said status means for transmitting available identifying address codes on the transmission medium thereby making said address codes available to stations desiring to communicate; at each station and said central distributor means, timing means for recognizing each of a multiplicity of discrete subperiods located within each period (P) of chronologically repetitive periods (P) of time; assignment means associated with said timing means for assigning one or more of said discrete subperiods as a distribution subperiod located at a predetermined position within said period (P), said distributor subperiod beiNg used by said central distributor means for conveying identifying address codes for use by stations; a distribution subperiod detector, associated with said timing means, at said stations and said central distributor means for recognizing said distribution subperiods; and means at each station responsive to said distribution subperiod detector for preempting an available identifying address code for use during communications with one or more stations.
Claim 16
Dependent Claim
108 words
System as recited in claim 13, also comprising: further assignment means for assigning ones of said multiplicity of subperiods with individual message meanings; message correlating means at the stations for associating each of a plurality of message meanings with respective ones of said subperiods; and signal sending means, at the sending stations, responsive to said message correlating means for inserting a station identifying address code into the selected subperiods having assigned message meanings corresponding the message means to be transferred; whereby a receiving station may, in response to a received identifying address code, derive the transferred message meanings corresponding to the subperiods having said received identifying address code.
Claim 17
Dependent Claim
46 words
System as recited in claim 13, further comprising at the stations: means associated with said distribution subperiod detector for removing a detected identifying address code from said distribution subperiod for subsequent use by a given station; and storage means for storing said removed identifying address code.
Claim 18
Dependent Claim
35 words
System as recited in claim 15, further comprising, at each station, further assignment means for assigning a return subperiod within said period (P) for returning said identifying address code to said central distributor after use.
Claim 19
Dependent Claim
232 words
An address-coded data communication system wherein communications between stations is carried out by sending station identifying address codes which permit an intended receiving station to distinguish its own intended data from other data carried on a transmission medium for other stations; comprising: a generator for producing a set of station identifying address codes; status means for indicting which of said set of identifying address codes are available and not in use by any of the stations at a given time; central distributor means responsive to said generator and said status means for transmitting available identifying address codes on the transmission medium for use by stations desiring to communicate; at each station and said central distributor, timing means for recognizing each of a multiplicity of discrete subperiods located within each period (P) of chronologically repetitive periods (P) of time; assignment means associated with said timing means for assigning one or more of said discrete subperiods as a distribution subperiod which is used by said central distributor means for conveying identifying address codes sent by said central distributor means; further assignment means associated with said timing means for assigning a return subperiod for returning said identifying address codes from the stations to said central distributor means after use; and means at each station responsive to said assignment means for preempting an available identifying address code for use during communications with one or more stations.
Claim 20
Dependent Claim
232 words
An address-coded data communication system wherein communications between stations is carried out by sending station identifying address codes which permit an intended receiving station to distinguish its own intended data from other data carried on a transmission medium for other stations; comprising: a generator for producing a set of station identifying address codes; status means for indicting which of said set of identifying address codes are available and not in use by any of the stations at a given time; central distributor means responsive to said generator and said status means for transmitting available identifying address codes on the transmission medium for use by stations desiring to communicate; at each station and said central distributor, timing means for recognizing each of a multiplicity of discrete subperiods located within each period (P) of chronologically repetitive periods (P) of time; assignment means associated with said timing means for assigning one or more of said discrete subperiods as a distribution subperiod which is used by said central distributor means for conveying identifying address codes sent by said central distributor means; further assignment means associated with said timing means for assigning a return subperiod for returning said identifying address codes from the stations to said central distributor means after use; and means at each station responsive to said assignment means for preempting an available identifying address code for use during communications with one or more stations.
Claim 21
Dependent Claim
311 words
An address-coded data communication system wherein communications between stations is carried out by sending station identifying address codes which permit an intended receiving station to distinguish its own intended data from other data carried on a transmission medium for other stations, comprising: a generator for producing a set of station identifying address codes; status means for indicating which of said set of identifying address codes are available and not in use by any of the stations at a given time; central distributor means responsive to said generator and said status means for transmitting available identifying address codes on the transmission medium making said address codes available to stations desiring to communicate; at each station and said central distributor means, timing means for recognizing each of a multiplicity of discrete subperiods located within each period (P) of chronologically repetitive periods (P) of time; assignment means associated with said timing means for assigning one or more of said subperiods as a distribution subperiod which is used by said central distributor means for conveying identifying address codes sent by said central distributor means; further assignment means associated with said timing means for assigning a discrete polling subperiod within said period (P) which is used by said central distributor means for the insertion of identifying address codes from said generator; means associated with said further assignment means and said central distributor means for inserting said address codes in said polling subperiod on said transmission medium; means associated with said timing means at the stations, for detecting said polling subperiod and for removing the address code inserted therein if said address code is presently being used by a given station; and logic means, included at the input in said status means, for detecting the return of address codes in said polling subperiods and determining which address codes have been removed by stations from said polling subperiods.
Claim 22
Dependent Claim
311 words
An address-coded data communication system wherein communications between stations is carried out by sending station identifying address codes which permit an intended receiving station to distinguish its own intended data from other data carried on a transmission medium for other stations, comprising: a generator for producing a set of station identifying address codes; status means for indicating which of said set of identifying address codes are available and not in use by any of the stations at a given time; central distributor means responsive to said generator and said status means for transmitting available identifying address codes on the transmission medium making said address codes available to stations desiring to communicate; at each station and said central distributor means, timing means for recognizing each of a multiplicity of discrete subperiods located within each period (P) of chronologically repetitive periods (P) of time; assignment means associated with said timing means for assigning one or more of said subperiods as a distribution subperiod which is used by said central distributor means for conveying identifying address codes sent by said central distributor means; further assignment means associated with said timing means for assigning a discrete polling subperiod within said period (P) which is used by said central distributor means for the insertion of identifying address codes from said generator; means associated with said further assignment means and said central distributor means for inserting said address codes in said polling subperiod on said transmission medium; means associated with said timing means at the stations, for detecting said polling subperiod and for removing the address code inserted therein if said address code is presently being used by a given station; and logic means, included at the input in said status means, for detecting the return of address codes in said polling subperiods and determining which address codes have been removed by stations from said polling subperiods.
Claim 23
Dependent Claim
36 words
System as recited in claim 18, further comprising storage means for storing those identifying address codes which have been sent out and returned in said polling subperiod and thereby determined as available and not in use.
Claim 24
Dependent Claim
227 words
Method for communicating data over a transmission medium between stations connected in a address-coded data communications system, comprising: generating, at a central station, station identifying address codes for use by the stations as an identifying code during communications; indicating, at said central station, which of said generated identifying address codes are available and not in use by any of the stations at a given time; assigning one or more distribution subperiods located at a predetermined position within repetitive periods (P) of time for distributing said available identifying address codes on said transmission medium; distributing, from a distributor means at said central station, said available identifying address codes on said trans-mission medium for use by stations as an identifying code during communications by inserting said avail-able identifying address codes into said distribution subperiods, so that the stations or a communication can be distinctly iden-tified by an identifying address code; detecting, at stations desiring to communicate, said distribution periods and removing said address codes therefrom; and sending, from sending station, said removed identifying address codes with data intelligence on said transmission medium in a form which permits the intended receiving station to recognize the data intelligence from other data carried on the transmission medium by detecting the identifying address code; whereby said identifying address codes are distributed to the system for use by communicating stations as their identifying codes.
Claim 25
Dependent Claim
227 words
Method for communicating data over a transmission medium between stations connected in a address-coded data communications system, comprising: generating, at a central station, station identifying address codes for use by the stations as an identifying code during communications; indicating, at said central station, which of said generated identifying address codes are available and not in use by any of the stations at a given time; assigning one or more distribution subperiods located at a predetermined position within repetitive periods (P) of time for distributing said available identifying address codes on said transmission medium; distributing, from a distributor means at said central station, said available identifying address codes on said trans-mission medium for use by stations as an identifying code during communications by inserting said avail-able identifying address codes into said distribution subperiods, so that the stations or a communication can be distinctly iden-tified by an identifying address code; detecting, at stations desiring to communicate, said distribution periods and removing said address codes therefrom; and sending, from sending station, said removed identifying address codes with data intelligence on said transmission medium in a form which permits the intended receiving station to recognize the data intelligence from other data carried on the transmission medium by detecting the identifying address code; whereby said identifying address codes are distributed to the system for use by communicating stations as their identifying codes.
Claim 26
Dependent Claim
38 words
Method as recited in claim 20, comprising the further step of storing, at said distributor means, said available identifying address codes in a central store for subsequent distribution to said system for use by stations desiring to communicate.
Claim 27
Dependent Claim
28 words
Method as recited in claim 21, further comprising the step of returning said identifying address codes from said station to said central store after use by communicating stations.
Claim 28
Dependent Claim
47 words
Method as recited in claim 20, wherein said step of indicating which of said identifying address codes are available comprises assigning one or more polling subperiods for polling the stations on a continuous basis as to their use of each address code located in said polling subperiods.
Claim 29
Dependent Claim
17 words
Method as recited in claim 20, wherein said identifying address codes are represented in binary digit form.
Claim 30
Dependent Claim
69 words
Method as recited in claim 20, further comprising the steps of: synchronizing the stations by inserting synchronizing signals in each of said periods (P) so that each station may operate in synchronism; and recognizing, at each station and said distributor means, said synchronizing signals and each of a multiplicity of discrete subperiods located within each period (P); whereby each station may detect the recognizable subperiods on the transmission medium.
Claim 31
Dependent Claim
92 words
Method as recited in claim 25, comprising the additional steps of: assigning each of a plurality of said subperiods with individual data message meanings; correlating, at each station, each of the subperiods with their respective assigned data message meanings; and inserting, from sending stations, identifying address codes into the selected subperiods having assigned data message meanings corresponding to the message meanings to be transferred; whereby a receiving station may, in response to a received identifying address code, derive the transferred message meanings corresponding to the subperiods having said received identifying address code.
Claim 32
Dependent Claim
55 words
Method as recited in claim 25, comprising the further step of storing, at the stations engaging in communications, the identifying address codes sent by said distributor means whereby each communication between stations on the transmission medium is distinguished from other communications by means of transmission of the so stored identifying address code of each station.
Claim 33
Dependent Claim
308 words
Method for communicating data between stations in an address-coded data communications system, comprising: generating, at a central station, station identifying address codes for use by the stations as an identifying code during communications; indicating, at said central station, which of said generated identifying address codes are available and not in use by any of the stations at a given time; distributing, from a distributor means, said available identifying address codes on a transmission medium for use by stations as an identifying code during communications so that the stations or a communication is distinctly identified by an identifying address code; synchronizing the stations so that each station may operate in synchronism with chronologically repetitive periods (P) of time; recognizing, at each station and said distributor means, each of a multiplicity of discrete subperiods located within each period (P) on said transmission medium; assigning one or more of said subperiods for conveying said available identifying address codes sent by said distributor means on said transmission medium for use by stations desiring to go on line; at each station, detecting the distributed identifying address codes located in recognizable subperiods on the transmission medium and removing said detected codes for a station''s use during communications; assigning a return subperiod for returning said identifying address codes from said stations to said distributor means after use; at said stations, inserting said identifying address codes in said return subperiod so that said returned identifying codes can be made available to other stations; and sending, from sending stations, said identifying address codes with data intelligence on said transmission medium in a form which permits the intended receiving station to recognize the data intelligence from other data carried on the transmission medium by detecting the identifying address code; whereby said identifying address codes are distributed to the system for use by communicating stations as their identifying codes.
Claim 34
Dependent Claim
308 words
Method for communicating data between stations in an address-coded data communications system, comprising: generating, at a central station, station identifying address codes for use by the stations as an identifying code during communications; indicating, at said central station, which of said generated identifying address codes are available and not in use by any of the stations at a given time; distributing, from a distributor means, said available identifying address codes on a transmission medium for use by stations as an identifying code during communications so that the stations or a communication is distinctly identified by an identifying address code; synchronizing the stations so that each station may operate in synchronism with chronologically repetitive periods (P) of time; recognizing, at each station and said distributor means, each of a multiplicity of discrete subperiods located within each period (P) on said transmission medium; assigning one or more of said subperiods for conveying said available identifying address codes sent by said distributor means on said transmission medium for use by stations desiring to go on line; at each station, detecting the distributed identifying address codes located in recognizable subperiods on the transmission medium and removing said detected codes for a station''s use during communications; assigning a return subperiod for returning said identifying address codes from said stations to said distributor means after use; at said stations, inserting said identifying address codes in said return subperiod so that said returned identifying codes can be made available to other stations; and sending, from sending stations, said identifying address codes with data intelligence on said transmission medium in a form which permits the intended receiving station to recognize the data intelligence from other data carried on the transmission medium by detecting the identifying address code; whereby said identifying address codes are distributed to the system for use by communicating stations as their identifying codes.
Claim 35
Dependent Claim
310 words
Method for communicating data between stations in an address-coded data communications systems, comprising: generating, at a central station, station Identifying address codes for use by the stations as an identifying code during communications; indicating, at said central station, which of said generated identifying address codes are available and not in use by any of the stations at a given time; distributing, from a distributor means, said available identifying address codes on a transmission medium for use by stations as an identifying code during communications so that the stations or a communication is distinctly identified by an identifying address code; synchronizing the stations so that each station may operate in synchronism with chronologically repetitive periods (P) of time; recognizing, at each station and said distributor means, each of a multiplicity of discrete subperiods located within each period (P) on said transmission medium; assigning one or more of said subperiods for conveying said available identifying address codes sent by said distributor means on said transmission medium for use by stations desiring to go on line; at each station, detecting the distributed identifying address codes located in recognizable subperiods on the transmission medium and removing said detected codes for a station''s use during communications; assigning a polling subperiod for polling the stations as to their use of identifying address codes located in said polling subperiod; at said central station, inserting identifying address codes in said polling subperiod to determine if any of the stations is using said address codes; and sending, from sending stations, said identifying address codes with data intelligence on said transmission medium in a form which permits the intended receiving station to recognize the data intelligence from other data carried on the transmission medium by detecting its own identifying address code; whereby said identifying address codes are distributed to the system for use by communicating stations as their identifying codes.
Claim 36
Dependent Claim
310 words
Method for communicating data between stations in an address-coded data communications systems, comprising: generating, at a central station, station Identifying address codes for use by the stations as an identifying code during communications; indicating, at said central station, which of said generated identifying address codes are available and not in use by any of the stations at a given time; distributing, from a distributor means, said available identifying address codes on a transmission medium for use by stations as an identifying code during communications so that the stations or a communication is distinctly identified by an identifying address code; synchronizing the stations so that each station may operate in synchronism with chronologically repetitive periods (P) of time; recognizing, at each station and said distributor means, each of a multiplicity of discrete subperiods located within each period (P) on said transmission medium; assigning one or more of said subperiods for conveying said available identifying address codes sent by said distributor means on said transmission medium for use by stations desiring to go on line; at each station, detecting the distributed identifying address codes located in recognizable subperiods on the transmission medium and removing said detected codes for a station''s use during communications; assigning a polling subperiod for polling the stations as to their use of identifying address codes located in said polling subperiod; at said central station, inserting identifying address codes in said polling subperiod to determine if any of the stations is using said address codes; and sending, from sending stations, said identifying address codes with data intelligence on said transmission medium in a form which permits the intended receiving station to recognize the data intelligence from other data carried on the transmission medium by detecting its own identifying address code; whereby said identifying address codes are distributed to the system for use by communicating stations as their identifying codes.
References Cited (Backward Citations)
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