US4034159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switching system for multichannel lines
Assignee: International Business Machines Corp
•
Filing: 1974-07-19
•
Granted: 1977-07-05
•
Expires: 1994-07-19
Abstract
Abstract A switching exchange of the space switching type is adapted to provide interconnection of the lines of a communication network, each line being able to provide several multiplex channels, each channel being different from the other ones in the frequency domain, in the time domain or in any other way. The control unit of a switching exchange of the space switching type is adapted to enable the system to interconnect more than two lines of the multiplex type together, by the provision of complementary logic which determines for any new connection of multiplex lines whether the required connection is possible or not in accordance with the state of the network when this request occurs. This operation is carried out by checking what are the lines which would be interconnected should the required connection be made, and whether the use of the transmission channels in the assembly of said lines, as it is in the initial state, will cause interference between the channels when the required connection is made. To carry this checking out, independent groups of interconnected lines are defined. The fact that said groups are independent and the changes which can be caused to said groups and to their independence by any new condition determine the connections to be checked before the new connection can be able to be made. Tables in memory, and logic, are provided to show present status and available possibilities of new interconnections.
Inventors
- 👤 Rene Henri Buron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:14
CPC Classifications
H; H04; H04Q; H04Q11/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
206 words
In a switching system providing space division interconnection of multiplex lines in independent groups wherein no line of any group formed by a specific interconnection participates in any other group, a first matrix comprising storage element arrays equal in number to the maximum number of independent groups, each array having storage elements corresponding to said lines for indicating the connected status of respective lines in said group, an additional storage array having storage elements corresponding to said lines for indicating a proposed new connection of said lines, and logic means for comparing, one array at a time, the arrays of said first matrix with said additional array, a set of latches for recording, by first matrix array, coincidence between at least one element of corresponding first matrix arrays and said additional array, a second matrix comprising storage element arrays corresponding to said latches, each said second matrix array having an ordered series of storage elements corresponding to multiplex channels of said lines for indicating use status of said channels, and logic means responsive to said latches to compare said second matrix arrays, selectively according to the state of said latches, and to provide signals indicative of those orders wherein more than one channel is in use.
Claim 2
Dependent Claim
206 words
In a switching system providing space division interconnection of multiplex lines in independent groups wherein no line of any group formed by a specific interconnection participates in any other group, a first matrix comprising storage element arrays equal in number to the maximum number of independent groups, each array having storage elements corresponding to said lines for indicating the connected status of respective lines in said group, an additional storage array having storage elements corresponding to said lines for indicating a proposed new connection of said lines, and logic means for comparing, one array at a time, the arrays of said first matrix with said additional array, a set of latches for recording, by first matrix array, coincidence between at least one element of corresponding first matrix arrays and said additional array, a second matrix comprising storage element arrays corresponding to said latches, each said second matrix array having an ordered series of storage elements corresponding to multiplex channels of said lines for indicating use status of said channels, and logic means responsive to said latches to compare said second matrix arrays, selectively according to the state of said latches, and to provide signals indicative of those orders wherein more than one channel is in use.
Claim 3
Dependent Claim
250 words
For use in a line switching network, means for determining whether a proposed space connection involving lines having multiplex channels is possible without interference with existing connections, said means comprising: a table including a plurality of group registers equal in number to the maximum possible number of independent groups of multiplex lines in the network, each said group register having a first part in which respective storage elements correspond to different lines for recording which of said lines in the respective group are connected in that group, a new connection register having storage elements also corresponding to said lines for recording indication of the lines to be connected to make a new connection, comparing circuits connected between each of said group registers and said new connection register for producing respective potential conflict identifying signals upon any coincidence between a connected line indication in said group registers and a line indication in said new connection register, said potential conflict identifying signals identifying which of said group registers are producing such coincidence, each said group register further comprising a second part containing as many elements of storage as there are multiplex channels in any one said lines for indicating which of said channels are in use in each said group, and means under the control of said potential conflict identifying signals for comparing the states of corresponding elements of said second part and responsive to indications therein that any channel is in use in more than one line identified by said signals.
Claim 4
Dependent Claim
250 words
For use in a line switching network, means for determining whether a proposed space connection involving lines having multiplex channels is possible without interference with existing connections, said means comprising: a table including a plurality of group registers equal in number to the maximum possible number of independent groups of multiplex lines in the network, each said group register having a first part in which respective storage elements correspond to different lines for recording which of said lines in the respective group are connected in that group, a new connection register having storage elements also corresponding to said lines for recording indication of the lines to be connected to make a new connection, comparing circuits connected between each of said group registers and said new connection register for producing respective potential conflict identifying signals upon any coincidence between a connected line indication in said group registers and a line indication in said new connection register, said potential conflict identifying signals identifying which of said group registers are producing such coincidence, each said group register further comprising a second part containing as many elements of storage as there are multiplex channels in any one said lines for indicating which of said channels are in use in each said group, and means under the control of said potential conflict identifying signals for comparing the states of corresponding elements of said second part and responsive to indications therein that any channel is in use in more than one line identified by said signals.
References Cited (Backward Citations)
US3281536A
Cited
US3462743A
Cited
US3609668A
Cited
US3705958A
Cited
US3818142A
Cited
US3761619A
Cited
US3819865A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |