US3812299A
Expired / Lapsed
US
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Arrangement for protecting a common highway in a common control communication switching system
Assignee: AG Communication Systems Corp
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Filing: 1973-03-28
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Granted: 1974-05-21
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Expires: 1993-03-28
Abstract
Abstract An arrangement is provided for protecting a common highway in a common control communication switching system of the type having full redundancy of the common control equipment, but not the trunks. In the particularly disclosed system, a truck type signal generator means is associated with each trunk and gates the truck type information onto both of the common highways servicing the ''''on-line'''' and ''''off-line'''' markers so that both markers can see the information and respond alike to maintain synchronous operation. The disclosed arrangement prevents any trunk type signal generator means which have failed on or are shorted from contaminating both common highways.
Inventors
- 👤 G Fleischfresser
- 👤 T Mila
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:52
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/54
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
327 words
In a common control communication switching system including a plurality of trunk frames each having a plurality of trunks associated with it, at least one marker, and a common highway over which the trunk type of each of said plurality of trunks is transmitted from said trunks to said marker, an arrangement for protecting said common highway from contamination as a result of more than one trunk type signal being coupled onto said common highway at one time due to a failure of the trunk type signal generating means comprising signal generating means associated with each of said trunks for producing a signal representative of the trunk type of the trunk with which it is associated, said marker coupling a frame enable signal to all of said signal generating means associated with said plurality of trunks within one of said trunk frames to simultaneously enabled them for subsequent one at a time operation to produce a trunk type signal, a plurality of groups of gating means each associated with said plurality of trunks within one of said trunk frames, said trunk type signals being coupled to said gating means and said gating means upon being enabled coupling said trunk type signals onto said common highway, monitoring means associated with each trunk frame and included within the coupling between said signal generating means and said gating means, said gating means being enabled upon coincidence of a trunk type signal and an interrogate signal from said marker to couple said trunk type signal onto said common highway, said monitoring means monitoring the output of said signal generating means and upon detecting the presence of a trunk type signal and the absence of said frame enable signal being operated to block said group of gating means associated with a trunk frame to prevent said trunk type signal produced by said signal generating means associated with said plurality of trunks within that Trunk frame from being coupled onto said common highway.
Claim 2
Dependent Claim
327 words
In a common control communication switching system including a plurality of trunk frames each having a plurality of trunks associated with it, at least one marker, and a common highway over which the trunk type of each of said plurality of trunks is transmitted from said trunks to said marker, an arrangement for protecting said common highway from contamination as a result of more than one trunk type signal being coupled onto said common highway at one time due to a failure of the trunk type signal generating means comprising signal generating means associated with each of said trunks for producing a signal representative of the trunk type of the trunk with which it is associated, said marker coupling a frame enable signal to all of said signal generating means associated with said plurality of trunks within one of said trunk frames to simultaneously enabled them for subsequent one at a time operation to produce a trunk type signal, a plurality of groups of gating means each associated with said plurality of trunks within one of said trunk frames, said trunk type signals being coupled to said gating means and said gating means upon being enabled coupling said trunk type signals onto said common highway, monitoring means associated with each trunk frame and included within the coupling between said signal generating means and said gating means, said gating means being enabled upon coincidence of a trunk type signal and an interrogate signal from said marker to couple said trunk type signal onto said common highway, said monitoring means monitoring the output of said signal generating means and upon detecting the presence of a trunk type signal and the absence of said frame enable signal being operated to block said group of gating means associated with a trunk frame to prevent said trunk type signal produced by said signal generating means associated with said plurality of trunks within that Trunk frame from being coupled onto said common highway.
Claim 3
Dependent Claim
65 words
In the common control communication switching system of claim 1, wherein said monitoring means further monitors said frame enable signals generated by said marker, said monitoring means upon detecting the presence of a frame enable signal for longer than an established time interval being operated to block said group of gating means associated with that trunk frame to which said frame enable signal is coupled.
Claim 4
Dependent Claim
27 words
In the common control communication switching system of claim 1, wherein said monitoring means is operated to block said group of gating means until it is reset.
Claim 5
Dependent Claim
74 words
In the common control communication switching system of claim 1, wherein said monitoring means comprises latch means which is operable to provide an output signal for blocking a group of said gating means, and trigger gate means enabled to operate said latch means upon detecting a trunk type signal being coupled to at least one of said gating means within a group of said gating means and the absence of a frame enable signal.
Claim 6
Dependent Claim
55 words
In the common control communication switching system of claim 4, wherein said monitoring means further includes timing means coupled to said latch means, said frame enable signal being coupled to said timer means and said timer means operating said latch means when said frame enable signal is present for longer than an estabilished time interval.
Claim 7
Dependent Claim
79 words
In the common control communication switching system of claim 1, wherein each of said groups of gating means includes a pre-determined number of gating means, said signal generating means associated with said plurality of trunks within a trunk frame each being coupled to a pre-determined one of said gating means to thereby indicate its trunk type, said gating means upon being enabled coupling a signal onto said common highway to represent the trunk type of trunks to said marker.
Claim 8
Dependent Claim
33 words
In the common control communication switching system of claim 6, wherein each group of gating means comprises five of said gating means, whereby five different trunk types can be transmitted to said marker.
Claim 9
Dependent Claim
67 words
In the common control communication switching system of claim 1, wherein two markers are provided and a common highway is associated with each of said markers for transmitting said trunk type signals to both of said markers, said system including a duplicate monitoring arrangement for each said marker and its associated common highway, whereby a failure of one such monitoring arrangement will only effect one common highway.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |