US4622664A — Channel control system for loop type signal trans…

Claim 1

Independent Claim 443 words

A loop type signal transmission channel control system comprising a plurality of information transmission posts which are linked up in a loop channel and arranged such that a channel idle code indicating a channel idle condition is normally circulated in the channel, each post regenerating and relaying said code; each post having a transmitting means arranged such that a post which must transmit information to other posts transmits such information to other posts after converting said channel idle code to a channel code indicating a channel busy condition under an assumption that a channel idle code was previously in circulation and, after said post has delivered said information, said post again delivers a channel idle code to the channel, whereby an assignment of the transmitting right is made between different posts; said system further comprising a means such that a post with the shortest detection time for the detection of an absence of a channel code in the loop initially delivers the channel idle code and delivers said channel idle code after an absence of a channel code wherein each post, which operates in either direction of one loop comprises: an A-system for operating in one loop direction and a B-system for operating in the other loop direction and a mode switch circuit for switching between a relay mode for coupling said post so as to relay a signal and a terminal mode for coupling said post so as to separate its A-system from its B-system for turning back a signal; each of said A and B systems comprising a circuit for detecting a channel carrier signal OFF and a circuit for generating a carrier ON-OFF signal and a circuit for detecting an approach and circulation of a channel code; wherein a post which has detected a channel carrier signal OFF switches itself into a terminal mode by its mode switch circuit and returns a carrier ON-OFF signal and a post which has detected the carrier ON-OFF signal switches itself into a terminal mode while continuing to output a second carrier ON-OFF signal, and wherein, when a channel carrier signal OFF occurs, a part of a loop including the source of the channel carrier signal OFF and a part of loop not including the source of the channel carrier signal OFF are distinguished and when a post in a terminal mode determines from its approach and circulation detect circuit that a channel code has circulated to both loops of the terminal post, then said post switches itself to a relay mode by its mode switch circuit and said two parts of the loop are merged again when the channel carrier signal OFF vanishes.

Claim 2

Dependent Claim 443 words

A loop type signal transmission channel control system comprising a plurality of information transmission posts which are linked up in a loop channel and arranged such that a channel idle code indicating a channel idle condition is normally circulated in the channel, each post regenerating and relaying said code; each post having a transmitting means arranged such that a post which must transmit information to other posts transmits such information to other posts after converting said channel idle code to a channel code indicating a channel busy condition under an assumption that a channel idle code was previously in circulation and, after said post has delivered said information, said post again delivers a channel idle code to the channel, whereby an assignment of the transmitting right is made between different posts; said system further comprising a means such that a post with the shortest detection time for the detection of an absence of a channel code in the loop initially delivers the channel idle code and delivers said channel idle code after an absence of a channel code wherein each post, which operates in either direction of one loop comprises: an A-system for operating in one loop direction and a B-system for operating in the other loop direction and a mode switch circuit for switching between a relay mode for coupling said post so as to relay a signal and a terminal mode for coupling said post so as to separate its A-system from its B-system for turning back a signal; each of said A and B systems comprising a circuit for detecting a channel carrier signal OFF and a circuit for generating a carrier ON-OFF signal and a circuit for detecting an approach and circulation of a channel code; wherein a post which has detected a channel carrier signal OFF switches itself into a terminal mode by its mode switch circuit and returns a carrier ON-OFF signal and a post which has detected the carrier ON-OFF signal switches itself into a terminal mode while continuing to output a second carrier ON-OFF signal, and wherein, when a channel carrier signal OFF occurs, a part of a loop including the source of the channel carrier signal OFF and a part of loop not including the source of the channel carrier signal OFF are distinguished and when a post in a terminal mode determines from its approach and circulation detect circuit that a channel code has circulated to both loops of the terminal post, then said post switches itself to a relay mode by its mode switch circuit and said two parts of the loop are merged again when the channel carrier signal OFF vanishes.

Claim 3

Dependent Claim 273 words

A loop type signal transmission channel control system as recited in claim 1, wherein each post includes a detection circuit for detecting a continuous absence of the channel code, and a circuit for outputting a split code so as to order a post to switch to a terminal mode and a circuit for detecting approach and circulation of the chanel code; and wherein a post which is in a relay mode has detected a continuous absence of a channel code, switches itself to a terminal mode by means of said mode switch circuit; and wherein a post which is in a terminal mode has detected a continuous absence of a channel code outputs a split code and a post which has received said split code relays said split code and at the same time switches itself to a terminal mode by means of said mode switch circuit; and wherein when a post in a terminal mode determines from its channel code approach and circulation detect circuit that a channel code is circulating to the loops on both sides of it, said post switches itself to a relay mode by its mode switch circuit, wherein the loops on both sides of it merge into a single loop; and wherein split elements of the loop in which the channel code is circulating are successively merged together and finally a part of loop including a fault and a part of loop not including the fault are distinguished and wherein upon recovery from the fault, a channel code circulates to the loop including the fault, and the parts of the loop are merged into a single loop.

Claim 4

Dependent Claim 155 words

A loop type signal transmission channel control system as recited in claim 1, wherein a master station is coupled to a loop channel constituting a group and wherein a plurality of such groups are provided; and wherein opposite ends of adjacent channels in such groups serve as a terminal designated post such that when a fault occurs in a channel of a specific group, posts on both sides of the loop including the fault change to a terminal mode and such that the terminal designated post, when it detects a sound loop isolated from its master station on one side loop of said terminal designated post, switches itself into a relay mode so as to cause said sound loop to merge in a channel of a different master station and upon recovery from the fault, said terminal designated post switches itself into a terminal mode so as to return the channel to its original condition.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-11-10	1990-05-12	1990-11-11	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-11-10	1994-05-12	1994-11-11	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-11-10	1998-05-12	1998-11-11	$7700.00	Window Closed / Lapsed

Channel control system for loop type signal transmission channel

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