Patent US3117387A successfully refreshed from Google Patents.
Patent US3864525A successfully refreshed from Google Patents.
US3864525A
Expired / Lapsed
US
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Time stage system for a pcm exchange
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1973-01-19
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Granted: 1975-02-04
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Expires: 1993-01-19
Abstract
Abstract A time stage system included in a PCM exchange working according to the time-space-time principle is connected to incoming and outgoing transmission links on which PCM words are received and sent out, and further connected to files ( highways) on which said PCM words are transferred to and from file contact planes for space switching. In order to decentralize the control of the time switching, the time stage system is divided into time substages each of which being connected to associated incoming and outgoing links. Each time substage is divided in time stage units each of which being connected to the associated links and to two associated files of which one goes to and the other comes from the file contact plane cooperating with the time stage unit. Each time substage includes as many time stage units as there are file contact planes. For time switching, each time stage unit comprises word memories and index memories. The PCM words are written cyclically into the word memories from which they are read randomly with the aid of indexes stored in the index memories or vice versa. For allotting address numbers to the PCM words, each time stage unit comprises an address memory connected to the outgoing file. Blocking devices guarantee that writing and reading never coincide in the same word memory and that an address number defining the space switching for a PCM word is transferred to the respective file contact plane immediately before such PCM word.
Inventors
- 👤 Nils Herbert Edstrom
- 👤 Stig Gustaf Wilhelm Lindqvist
- 👤 Gunnar Erik Willia Sparrendahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:13
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04; H04Q11/0407
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
682 words
A time stage system for a PCM exchange utilizing an assemblage including a first time stage, a space stage with file contact planes and a second time stage with files connecting the first time stage to the contact planes of the space stage and further files connected the contact planes of the space stage to the second time stage wherein PCM words are received on incoming transmission links connected to the first time stage and the PCM words are transmitted on outgoing transmission links connected to the second time stage in first time slots associated with a first time division multiplex system, wherein the PCM words are transferred from the first time stage via the files and the space stage to the second time stage in second time slots associated with a second time division multiplex system, each of the PCM words being identified by a receiving and sending index and an address number allotted to the file through which the PCM words will be transferred from the first time stage to the second time stage, a clock means for the exchange including a clock generator defining the first and second time slots to have equal durations and the start of a first time slot coinciding with the start of a second time slot, the clock means also including means for generating in each of the second time slots two successive activating pulses, the exchange further including first and second scanning means connected to the clock means for performing memory scanning operations in synchronism with the first and second time division multiplex systems, respectively, said time stage system comprising a plurality of time substages, each of said time substages being connected to at least one associated incoming link and to at least one associated outgoing link of the transmission links and comprising a plurality of identical time stage units each being connected to all of the incoming and outgoing links connected to its time substage and furthermore connected to one associated file of the files going to and connected to one associated file of the files coming from the file contact plane cooperating with the time stage unit, each time substage including as many time stage units as there are file contact planes in the space stage, each time stage unit comprising at least one receiving word memory and at least one sending word memory which for writing and reading of PCM words, respectively, are connected to their respective link of the links associated with the time substage and to the first scanning means whereby PCM words are transferred between the associated links and the sending and receiving word memories under the control of said first scanning means, said receiving and sending word memories being provided with a receiving and a sending decoder means for decoding receiving and sending indices, respectively, and being connected to the outgoing and incoming file associated with the time stage unit, each time stage unit further comprising a receiving index memory and a sending index memory for storage of the receiving and sending indices, means for connecting said receiving index memory and said sending index memory to said receiving and sending decoder means, respectively, and means for connecting said second scanning means to said sending index memory and said receiving index memory whereby PCM words are transferred between the associated files and the sending and receiving memories at times indicated by the index memories under control of said second scanning means, and an address memory for storage of the address numbers allotted to the files coming from the space stage, said address memory when reading being connected to the second scanning means and to the file going to the space stage, each time stage unit furthermore comprising first blocking means connected to the clock generator for preventing, during the first of the successive activation pulses, reading from the receiving word memories and writing into the sending word memories, and for preventing, during the second of said successive activAtion pulses, writing into the receiving word memories and reading from the sending word memories and from the address memory.
Claim 2
Dependent Claim
682 words
A time stage system for a PCM exchange utilizing an assemblage including a first time stage, a space stage with file contact planes and a second time stage with files connecting the first time stage to the contact planes of the space stage and further files connected the contact planes of the space stage to the second time stage wherein PCM words are received on incoming transmission links connected to the first time stage and the PCM words are transmitted on outgoing transmission links connected to the second time stage in first time slots associated with a first time division multiplex system, wherein the PCM words are transferred from the first time stage via the files and the space stage to the second time stage in second time slots associated with a second time division multiplex system, each of the PCM words being identified by a receiving and sending index and an address number allotted to the file through which the PCM words will be transferred from the first time stage to the second time stage, a clock means for the exchange including a clock generator defining the first and second time slots to have equal durations and the start of a first time slot coinciding with the start of a second time slot, the clock means also including means for generating in each of the second time slots two successive activating pulses, the exchange further including first and second scanning means connected to the clock means for performing memory scanning operations in synchronism with the first and second time division multiplex systems, respectively, said time stage system comprising a plurality of time substages, each of said time substages being connected to at least one associated incoming link and to at least one associated outgoing link of the transmission links and comprising a plurality of identical time stage units each being connected to all of the incoming and outgoing links connected to its time substage and furthermore connected to one associated file of the files going to and connected to one associated file of the files coming from the file contact plane cooperating with the time stage unit, each time substage including as many time stage units as there are file contact planes in the space stage, each time stage unit comprising at least one receiving word memory and at least one sending word memory which for writing and reading of PCM words, respectively, are connected to their respective link of the links associated with the time substage and to the first scanning means whereby PCM words are transferred between the associated links and the sending and receiving word memories under the control of said first scanning means, said receiving and sending word memories being provided with a receiving and a sending decoder means for decoding receiving and sending indices, respectively, and being connected to the outgoing and incoming file associated with the time stage unit, each time stage unit further comprising a receiving index memory and a sending index memory for storage of the receiving and sending indices, means for connecting said receiving index memory and said sending index memory to said receiving and sending decoder means, respectively, and means for connecting said second scanning means to said sending index memory and said receiving index memory whereby PCM words are transferred between the associated files and the sending and receiving memories at times indicated by the index memories under control of said second scanning means, and an address memory for storage of the address numbers allotted to the files coming from the space stage, said address memory when reading being connected to the second scanning means and to the file going to the space stage, each time stage unit furthermore comprising first blocking means connected to the clock generator for preventing, during the first of the successive activation pulses, reading from the receiving word memories and writing into the sending word memories, and for preventing, during the second of said successive activAtion pulses, writing into the receiving word memories and reading from the sending word memories and from the address memory.
Claim 3
Dependent Claim
191 words
Time stage system according to claim 1 in which each of the time stage units further comprises a time slot register for registration of a slot number identifying one of the second time slots, and for the purpose of such registering being connected to the incoming file of said time stage unit, means for connecting said receiving index memory, said sending index memory and said address memory of each time stage unit, for the purpose of writing, to the incoming file of the time stage unit and a slot number decoder connected to said time slot register, each time stage unit further comprising second blocking means connected to the clock generator and operative during the first of the activation pulses in predetermined second time slots for preventing writing into said sending word memories and for allowing writing into said time slot register respectively, and said second blocking means further allowing, during the second of said activation pulses in their respective selected second time slot of said predetermined second time slots, writing into the receiving index memory, into the address memory and into the sending index memory of said time stage unit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |