US3906159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
TDM exchange with incoming PCM frames delayed with respect to outgoing PCM frames
Assignee: Siemens AG
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Filing: 1973-04-26
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Granted: 1975-09-16
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Expires: 1993-04-26
Abstract
Abstract A time multiplex communication system for transmission of pulse code modulated signals, using several exchange stations. At each exchange station, varying delays in transmission are compensated for by insertion of delay lines in the transmission paths, to synchronize the pulse frames of the arriving lines with each other. The pulse frames of the departing lines are also synchronized with each other. At each exchange station, the next available time channel is assigned to a signal to be forwarded, as compared with the signal as it arrives at the station. The pulse frames of departing lines are delayed by a set time interval as compared with arriving lines, and the time slots within pulse frames which are assigned to arriving and departing signals are also so set, to require the minimum storage capacity at the exchange stations.
Inventors
- 👤 Karl-Anton Lutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:31
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0635; H04J3/0676; H04J3/062
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
390 words
In apparatus for transmitting data signals in a time multiplex telecommunication system having a plurality of exchange stations, pairs of said exchange stations being connected by at least a pair of transmission lines for bi-directional transmission, said signals being transmitted thereover in time channels in a pulse frame constituted by a plurality of time channels, the data signals in a given time channel in adjacent pulse frames being equally spaced onE from the other, wherein the pulse frames departing on transmission lines carring departing transmissions from a said exchange station are synchronized with each other, wherein pulse frames arriving at said exchange station on transmission lines carrying arriving data signals are synchronized with each other by the insertion of delay means in said arriving transmission lines, wherein for the establishment of a connection through said exchange stations, which connection is in a given time channel in a pulse frame on an arriving line, the next free time channel in a pulse frame on the departing line is assigned, said given and said next time channels occupying the same relative positions in the arriving and departing pulse frames, the improvement comprising: said delay means being constructed to introduce a delay time such that pulse frames in transmission lines departing from a said exchange station are displaced with respect to those on incoming transmission lines by a period of time having a magnitude of tv, where tv (tx + ty,)/2 and tx and ty being the time period between the time of arrival of a given time channel at said exchange station and the time of departure of the same time channel in one direction of transmission and the other direction of transmission, respectively, whereby tv (tr + ts - T)/2, where T is the duration of a pulse frame and where tr defines the time interval between the time of appearance of a time slot to be allocated to a connection in one direction of transmission over an outgoing line and the time of appearance of the time slot used over the associated incoming line and where ts defines the time interval between the time of appearance of the time slot to be allocated to the connection in the other direction of transmission over an outgoing line and the time of appearance of the time slot over the associated incoming line.
Claim 2
Dependent Claim
390 words
In apparatus for transmitting data signals in a time multiplex telecommunication system having a plurality of exchange stations, pairs of said exchange stations being connected by at least a pair of transmission lines for bi-directional transmission, said signals being transmitted thereover in time channels in a pulse frame constituted by a plurality of time channels, the data signals in a given time channel in adjacent pulse frames being equally spaced onE from the other, wherein the pulse frames departing on transmission lines carring departing transmissions from a said exchange station are synchronized with each other, wherein pulse frames arriving at said exchange station on transmission lines carrying arriving data signals are synchronized with each other by the insertion of delay means in said arriving transmission lines, wherein for the establishment of a connection through said exchange stations, which connection is in a given time channel in a pulse frame on an arriving line, the next free time channel in a pulse frame on the departing line is assigned, said given and said next time channels occupying the same relative positions in the arriving and departing pulse frames, the improvement comprising: said delay means being constructed to introduce a delay time such that pulse frames in transmission lines departing from a said exchange station are displaced with respect to those on incoming transmission lines by a period of time having a magnitude of tv, where tv (tx + ty,)/2 and tx and ty being the time period between the time of arrival of a given time channel at said exchange station and the time of departure of the same time channel in one direction of transmission and the other direction of transmission, respectively, whereby tv (tr + ts - T)/2, where T is the duration of a pulse frame and where tr defines the time interval between the time of appearance of a time slot to be allocated to a connection in one direction of transmission over an outgoing line and the time of appearance of the time slot used over the associated incoming line and where ts defines the time interval between the time of appearance of the time slot to be allocated to the connection in the other direction of transmission over an outgoing line and the time of appearance of the time slot over the associated incoming line.
References Cited (Backward Citations)
US2910541A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |