US3914552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
PCM time-division multiplex switching procedure
Assignee: Siemens AG
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Filing: 1974-03-26
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Granted: 1975-10-21
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Expires: 1994-03-26
Abstract
Abstract A PCM switching center is described wherein synchronization and signalling occur independently of entry of information into the address memories, the crosspoint controls between individual multiplex connections being directly accessed by a phase counter which determines the switching phases thereby momentarily bypassing the address memory of the switching center.
Inventors
- 👤 Karlheinz Neufang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:29
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
283 words
A procedure for operating a PCM time-division communication network having a number of PCM time-division multiplex switching centers connected to one another via four-wire time-division multiplex connections, said PCM time-division mutiplex switching centers having storage devices individually assigned to each pair of conductors of one of the four-wire time-division multiplex connections to store all the elements of information coming in or to be retransmitted on one of the time-division multiplex connections during a pulse frame, the pulse frame being determined by the duration of the time-division multiplex system sampling period, said centers further having crosspoint elements for the space-division switching of the elements of information, link connections connecting said crosspoint elements to the crosspoints allocated to the other time-division multiplex connections and address memories which produce the space and time-division coordination of the operation of said crosspoint elements and of the storage locations assigned to the individual communication time slots, further having means for electronic signal processing and data matching, each having access to the particular storage device of a switching center via a separate line connection, characterized in that the signals transmitted in a specified communication channel (e.g., 16) and the synchronization information for the time-division multiplex connection transmitted in another specified communication channel (e.g., 0) during fixed switching phases (e.g., 0 or 23) are switched to and from the particular device for electronic signal processing or data matching, for which the particular storage (KVS, GVS) and crosspoint controls (D,M) are directly accessed during the fixed swtiching phases by the phase counter (PAZ1) which determines the switching phases and therefore normally cause the output of selection addresses from the storages and crosspoints by the address memories (VHS, KHS) bypassing the address memories.
Claim 2
Dependent Claim
283 words
A procedure for operating a PCM time-division communication network having a number of PCM time-division multiplex switching centers connected to one another via four-wire time-division multiplex connections, said PCM time-division mutiplex switching centers having storage devices individually assigned to each pair of conductors of one of the four-wire time-division multiplex connections to store all the elements of information coming in or to be retransmitted on one of the time-division multiplex connections during a pulse frame, the pulse frame being determined by the duration of the time-division multiplex system sampling period, said centers further having crosspoint elements for the space-division switching of the elements of information, link connections connecting said crosspoint elements to the crosspoints allocated to the other time-division multiplex connections and address memories which produce the space and time-division coordination of the operation of said crosspoint elements and of the storage locations assigned to the individual communication time slots, further having means for electronic signal processing and data matching, each having access to the particular storage device of a switching center via a separate line connection, characterized in that the signals transmitted in a specified communication channel (e.g., 16) and the synchronization information for the time-division multiplex connection transmitted in another specified communication channel (e.g., 0) during fixed switching phases (e.g., 0 or 23) are switched to and from the particular device for electronic signal processing or data matching, for which the particular storage (KVS, GVS) and crosspoint controls (D,M) are directly accessed during the fixed swtiching phases by the phase counter (PAZ1) which determines the switching phases and therefore normally cause the output of selection addresses from the storages and crosspoints by the address memories (VHS, KHS) bypassing the address memories.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |