Abstract The proposal allows a switching center to be loaded with a combination of bothway circuit and unidirectional circuitcarrying systems with no increase in control complexity, no new switching stage(s), no frequency changing and no alteration to the super-highway format. The bothway serial highways are assembled in groups of four, as compared with the groups of eight employed in the original unidirectional-working scheme. Each bothway channel is associated with two time-slots on the parallel super-highway, one time-slot being inherently originating and the other terminating. In the receive direction the distribution of one serial channel on a highway to two parallel channels on the super-highway is accomplished at the serial-parallel converter stage. The length of each serial-parallel shift register is increased by one bit relative to the unidirectional scheme. Two sets of multiplexing gates are then associated with the output of each such shift-register, and this gating is such that if the two sets of gates are enabled in turn, at consecutive bit-times, then the complete channel contained in one shift-register appears at consecutive time-slots (one originating, one terminating) on the super-highway. In the transmit direction a complementary function is employed.
Inventors
👤 Alexander Schroder Philip
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-23 18:46
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
279 words
A time division multiplex telecommunication switching system comprising in combination: a plurality of first t.d.m. junctions each having y channels per frame, y/2 being dedicated originating channels whereas y/2 are dedicated terminating channels, each having x bits per channel, a plurality of receive highways arranged in groups of x and operated such that the incoming channels of a paIr of said first t.d.m. junctions are served by a corresponding pair of receive highways in such manner that one of the pair of highways carries y originating channels whereas the other of the pair carries y terminating channels, a plurality of bothway-working junctions arranged in groups of x/2 in which each bothway junction channel is usable as either an originating or terminating channel, a plurality of channel information duplicating means, one for each bothway working junction, arranged to generate the information content of each incoming-bothway-working junction channel in two successive exchange super-highway time slots, a plurality of x bit parallel receive super-highways some individually serving each group of said first t.d.m. junctions and the remainder serving individually each group of bothway working junctions, each receive super-highway carrying x.y channels, x.y/2 being originating channels interleaved with x.y/2 terminating channels and each super-highway channel occupies one exchange super-highway time slot, a plurality of time switching cord circuits arranged to provide channel alignment between interconnected t.d.m. junction channels, a plurality of transmit super-highways carrying x.y/2 originating channels interleaved with x.y/2 terminating channels, a first switching matrix having its inlets connected to said receive super-highways and its outlets connected to said cord circuits and a second switching matrix having its inlets connected to said cord circuits and its outlets connected to said transmit superhighways.
Claim 2
Dependent Claim
279 words
A time division multiplex telecommunication switching system comprising in combination: a plurality of first t.d.m. junctions each having y channels per frame, y/2 being dedicated originating channels whereas y/2 are dedicated terminating channels, each having x bits per channel, a plurality of receive highways arranged in groups of x and operated such that the incoming channels of a paIr of said first t.d.m. junctions are served by a corresponding pair of receive highways in such manner that one of the pair of highways carries y originating channels whereas the other of the pair carries y terminating channels, a plurality of bothway-working junctions arranged in groups of x/2 in which each bothway junction channel is usable as either an originating or terminating channel, a plurality of channel information duplicating means, one for each bothway working junction, arranged to generate the information content of each incoming-bothway-working junction channel in two successive exchange super-highway time slots, a plurality of x bit parallel receive super-highways some individually serving each group of said first t.d.m. junctions and the remainder serving individually each group of bothway working junctions, each receive super-highway carrying x.y channels, x.y/2 being originating channels interleaved with x.y/2 terminating channels and each super-highway channel occupies one exchange super-highway time slot, a plurality of time switching cord circuits arranged to provide channel alignment between interconnected t.d.m. junction channels, a plurality of transmit super-highways carrying x.y/2 originating channels interleaved with x.y/2 terminating channels, a first switching matrix having its inlets connected to said receive super-highways and its outlets connected to said cord circuits and a second switching matrix having its inlets connected to said cord circuits and its outlets connected to said transmit superhighways.
Claim 3
Dependent Claim
58 words
A time division multiplex telecommunication switching system as claimed in claim 1 and in which said information duplicating means includes x/2 shift registers, one for each bothway working junction in a group, and said shift registers are provided with x + 1, x + 3, x + 5 . . . x + (x - 1) stages respectively.