US3894184A
Expired / Lapsed
US
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Time division multiplex subscriber circuit
Assignee: International Standard Electric Corp
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Filing: 1974-04-08
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Granted: 1975-07-08
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Expires: 1994-04-08
Abstract
Abstract A time-division-multiplex subscriber circuit provides the synchronous transfer of dial signals and teleprinter character signals into a time-division-multiplex system by means of a buffer and a pair of flip-flop devices in response to differences in the changes of polarity of the signals and at least one counter in cooperation with a divider for dividing the clock rate of the multiplex system down to the character signal repetition rate when one of the flip-flop devices is energized. The character signal repetition rate also controls the clock input of the buffer storage device so that the pair of flip-flop devices, the counter and divider become reset when the counter has reached a predetermined counting value.
Inventors
- 👤 Herbert Aulhorn
- 👤 Harry Schulz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:34
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/50; H04L12/52; H04L12/525; H04L5/00; H04L5/22; H04L5/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
In a time-division-multiplex circuit arrangement including a transmitter-distributor, and a source of multiplex clock rate pulses and incoming dial and teleprinter character signals, a time-division-multiplex subscriber circuit comprising: means for bit-wise transfer of the teleprinter character and dial signals according to a counting code and into the transmitter-distributor cycle, said transfer means including a buffer for storing the signals at the multiplex clock rate and with a delay, and a counting device for counting the clock rate pulses and ending the setting of the buffer after the counting device has reached a predetermined counting value, whereby said counting value is determined by the direction of the change of polarity of said signals at the beginning of counting.
Claim 2
Dependent Claim
117 words
In a time-division-multiplex circuit arrangement including a transmitter-distributor, and a source of multiplex clock rate pulses and incoming dial and teleprinter character signals, a time-division-multiplex subscriber circuit comprising: means for bit-wise transfer of the teleprinter character and dial signals according to a counting code and into the transmitter-distributor cycle, said transfer means including a buffer for storing the signals at the multiplex clock rate and with a delay, and a counting device for counting the clock rate pulses and ending the setting of the buffer after the counting device has reached a predetermined counting value, whereby said counting value is determined by the direction of the change of polarity of said signals at the beginning of counting.
Claim 3
Dependent Claim
84 words
The time-division-multiplex subscriber circuit of claim 1 further including: a pair of flip-flop devices which respond to changes of polarity of said signals; and a divider for dividing the multiplex clock rate, said dIvider responsive to one of said two flip-flop devices and wherein said teleprinter character signal repetition controls the clock input of the buffer and the input of the counting device, said one flip-flop device, said counting device and said divider becoming reset when said counting device reaches a predetermined counting value.
Claim 4
Dependent Claim
56 words
The time-division-multiplex subscriber circuit according to claim 2 wherein said counting device comprises a pair of first and second counters, the first of which becomes enabled by a response from said first flip-flop to a count of seven and the second counter becomes enabled by a response from the second flip-flop to a count of four.
Claim 5
Dependent Claim
57 words
The time-division-multiplex subscriber circuit according to claim 2 wherein the counting device comprises a counter preset to two counting values and is responsive to either of said flip-flops wherein said counter counts to a count of seven in response to a first set of flip-flops and to a count of four upon response from said second flip-flop.
Claim 6
Dependent Claim
20 words
The time-division-multiplex subscriber circuit according to claim 4 wherein the counter counts to five upon response from said second flip-flop.
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |