US5329526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trunk line identification system
Assignee: Fujitsu Ltd
•
Filing: 1992-03-12
•
Granted: 1994-07-12
•
Expires: 2012-03-12
Abstract
Abstract A trunk line identification system includes a line switch part connected to each of a plurality of channels of a transmission line, channel processing parts for processing signals received from and transmitted to the transmission line via the line switch part, where the channel processing parts are provided with respect to each of the channels and include first and second parts, and a switching system for switching signals. When relaying a signal received by a first channel processing part from the transmission line via the line switch part to the transmission line via the switching system and a second channel processing part, the first part of the second channel processing part transmits an identification signal to the first channel processing part via the switching system, and the second part of the first channel processing part judges whether or not a line being used is a trunk line based on whether or not the identification signal is detected.
Inventors
- 👤 Shigeru Murata
- 👤 Kaoru Nagakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:12
CPC Classifications
H; H04; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
224 words
A trunk line identification system for one of connecting channels of a first transmission line to a local subscriber of a first station and forming a trunk connection of the first transmission line with a second transmission line to connect the channels to a second station, the trunk line identification system comprising: a line switch part connected to each of a plurality of channels of a first transmission line; channel processing parts, coupled to said line switch part, for processing signals received from and transmitted to first and second transmission lines via said line switch part, said line switch part connecting each channel with corresponding channel processing parts; and a switching system, connected to said channel processing parts, switching signals when relaying a signal received by a first channel processing part from the first transmission line via said line switch part to the second transmission line via said switching system and a second channel processing part, said second channel processing part transmitting an identification signal to the first channel processing part via said switching system, and said first channel processing part judging whether or not a line is being used as a trunk line based on whether the identification signal is detected, said line switch part forming a trunk connection between said first and second channel processing parts when the identification signal is detected.
Claim 2
Dependent Claim
224 words
A trunk line identification system for one of connecting channels of a first transmission line to a local subscriber of a first station and forming a trunk connection of the first transmission line with a second transmission line to connect the channels to a second station, the trunk line identification system comprising: a line switch part connected to each of a plurality of channels of a first transmission line; channel processing parts, coupled to said line switch part, for processing signals received from and transmitted to first and second transmission lines via said line switch part, said line switch part connecting each channel with corresponding channel processing parts; and a switching system, connected to said channel processing parts, switching signals when relaying a signal received by a first channel processing part from the first transmission line via said line switch part to the second transmission line via said switching system and a second channel processing part, said second channel processing part transmitting an identification signal to the first channel processing part via said switching system, and said first channel processing part judging whether or not a line is being used as a trunk line based on whether the identification signal is detected, said line switch part forming a trunk connection between said first and second channel processing parts when the identification signal is detected.
Claim 3
Dependent Claim
25 words
The trunk line identification system as claimed in claim 1, wherein said second channel processing part generates the identification signal which indicates the second channel.
Claim 4
Dependent Claim
34 words
The trunk line identification system as claimed in claim 1, wherein said channel processing parts transmit the identification signal to said switching system in a direction opposite to a connecting direction of a call.
Claim 5
Dependent Claim
41 words
The trunk line identification system as claimed in claim 1, wherein said switching system forms a loop back path, which connects the first and second channel processing parts only when the signal received from the transmission line is to be relayed.
Claim 6
Dependent Claim
37 words
The trunk line identification system as claimed in claim 1, which further comprises control means, coupled to each of said channel processing parts, for controlling a connection of said line switch part to the second transmission line.
Claim 7
Dependent Claim
43 words
The trunk line identification system as claimed in claim 5, wherein said line switch part connects two channels corresponding to the first and second channel processing parts when the first channel processing part detects the identification signal from the second channel processing part.
Claim 8
Dependent Claim
40 words
The trunk line identification system as claimed in claim 1, wherein each channel processing part includes compression means for subjecting a signal received from and transmitted to the transmission line via said line switch part to a predetermined signal processing.
Claim 9
Dependent Claim
76 words
The trunk line identification system as claimed in claim 7, which further comprises control means, coupled to each of said channel processing parts, for controlling compression means of each of the channel processing parts based on outputs of each of said channel processing parts, said control means bypassing the predetermined signal processing in said first and second channel processing parts when the first channel processing part detects the identification signal from the second channel processing part.
Claim 10
Dependent Claim
54 words
The trunk line identification system as claimed in claim 1, wherein said switching system is connected to a subscriber, and said switching system transmits a signal received from the transmission line via the channel processing part to the local subscriber of said first station if a destination of this signal is the local subscriber.
Claim 11
Dependent Claim
156 words
A trunk line identification system connected to a transmission line having channels, the trunk line identification system comprising: a line switch part connected to each of the channels; channel processing parts, coupled to said line switch part, for processing signals received from and transmitted to the transmission line via said line switch part; and a switching system, connected to said channel processing parts, switching signals and relaying at least one signal received by a first channel processing part from the transmission line by way of said line switch part to the transmission line by way of said switching system and a second channel processing part, wherein the second channel processing part transmits an identification signal to the first channel processing part by way of said switching system, and said first channel processing part judges whether or not a line is being used as a trunk line based on whether or not the identification signal is detected.
Claim 12
Dependent Claim
156 words
A trunk line identification system connected to a transmission line having channels, the trunk line identification system comprising: a line switch part connected to each of the channels; channel processing parts, coupled to said line switch part, for processing signals received from and transmitted to the transmission line via said line switch part; and a switching system, connected to said channel processing parts, switching signals and relaying at least one signal received by a first channel processing part from the transmission line by way of said line switch part to the transmission line by way of said switching system and a second channel processing part, wherein the second channel processing part transmits an identification signal to the first channel processing part by way of said switching system, and said first channel processing part judges whether or not a line is being used as a trunk line based on whether or not the identification signal is detected.
Claim 13
Dependent Claim
167 words
A trunk line identification system connected to a transmission line having channels, the trunk line identification system comprising: a line switch part connected to each of the channels; channel processing parts, coupled to said line switch part, for processing signals received from and transmitted to the transmission line via said line switch part; and a switching system, connected to said channel processing parts, switching signals and relaying at least one signal received by a first channel processing part from the transmission line by way of said line switch part to the transmission line by way of said switching system and a second channel processing part, wherein the second channel processing part transmits an identification signal to the first channel processing part by way of said switching system in a direction opposite to a connecting direction of a call, and said first channel processing part judges whether or not a line is being used as a trunk line based on whether or not the identification signal is detected.
Claim 14
Dependent Claim
167 words
A trunk line identification system connected to a transmission line having channels, the trunk line identification system comprising: a line switch part connected to each of the channels; channel processing parts, coupled to said line switch part, for processing signals received from and transmitted to the transmission line via said line switch part; and a switching system, connected to said channel processing parts, switching signals and relaying at least one signal received by a first channel processing part from the transmission line by way of said line switch part to the transmission line by way of said switching system and a second channel processing part, wherein the second channel processing part transmits an identification signal to the first channel processing part by way of said switching system in a direction opposite to a connecting direction of a call, and said first channel processing part judges whether or not a line is being used as a trunk line based on whether or not the identification signal is detected.
Claim 15
Dependent Claim
184 words
A trunk line identification system connected to a transmission line having channels, the trunk line identification system comprising: a line switch part connected to each of the channels; channel processing parts, coupled to said line switch part, for processing signals received from and transmitted to the transmission line via said line switch part; and a switching system, connected to said channel processing parts, switching signals and relaying at least one signal received by a first channel processing part from the transmission line by way of said line switch part to the transmission line by way of said switching system and a second channel processing part, wherein the second channel processing part transmits an identification signal to the first channel processing part by way of said switching system, and said first channel processing part judges whether or not a line is being used as a trunk line based on whether or not the identification signal is detected, said switching systems forms a loop back path which connects the first and second channel processing parts only when the signal received from the transmission line is relayed.
Claim 16
Dependent Claim
184 words
A trunk line identification system connected to a transmission line having channels, the trunk line identification system comprising: a line switch part connected to each of the channels; channel processing parts, coupled to said line switch part, for processing signals received from and transmitted to the transmission line via said line switch part; and a switching system, connected to said channel processing parts, switching signals and relaying at least one signal received by a first channel processing part from the transmission line by way of said line switch part to the transmission line by way of said switching system and a second channel processing part, wherein the second channel processing part transmits an identification signal to the first channel processing part by way of said switching system, and said first channel processing part judges whether or not a line is being used as a trunk line based on whether or not the identification signal is detected, said switching systems forms a loop back path which connects the first and second channel processing parts only when the signal received from the transmission line is relayed.
Claim 17
Dependent Claim
188 words
A trunk line identification system connected to a transmission line having channels, the trunk line identification system comprising: a line switch part connected to each of the channels; channel processing parts, coupled to said line switch part, for processing signals received from and transmitted to the transmission line via said line switch part; and a switching system, connected to said channel processing parts, switching signals and relaying at least one signal received by a first channel processing part from the transmission line by way of said line switch part to the transmission line by way of said switching system and a second channel processing part, wherein The second channel processing part transmits an identification signal to the first channel processing part by way of said switching system, and said first channel processing part judges whether or not a line is being used as a trunk line based on whether or not the identification signal is detected, said line switch part connects to channels corresponding to the first and second channel processing parts when the first channel processing part detects the identification signal from the second channel processing part.
Claim 18
Dependent Claim
188 words
A trunk line identification system connected to a transmission line having channels, the trunk line identification system comprising: a line switch part connected to each of the channels; channel processing parts, coupled to said line switch part, for processing signals received from and transmitted to the transmission line via said line switch part; and a switching system, connected to said channel processing parts, switching signals and relaying at least one signal received by a first channel processing part from the transmission line by way of said line switch part to the transmission line by way of said switching system and a second channel processing part, wherein The second channel processing part transmits an identification signal to the first channel processing part by way of said switching system, and said first channel processing part judges whether or not a line is being used as a trunk line based on whether or not the identification signal is detected, said line switch part connects to channels corresponding to the first and second channel processing parts when the first channel processing part detects the identification signal from the second channel processing part.
Claim 19
Dependent Claim
187 words
A trunk line identification system connected to a transmission line having channels, the trunk line identification system comprising: a line switch part connected to each of the channels; channel processing parts, coupled to said line switch part, for processing signals received from and transmitted to the transmission line via said line switch part; and a switching system, connected to said channel processing parts, switching signals and relaying at least one signal received by a first channel processing part from the transmission line by way of said line switch part to the transmission line by way of said switching system and a second channel processing part, wherein the second channel processing part transmits an identification signal to the first channel processing part by way of said switching system, and said first channel processing part judges whether or not a line is being used as a trunk line based on whether or not the identification signal is detected, each channel processing part includes compression means for subjecting a signal received from and transmitted to the transmission line by way of said line switch part to a predetermined signal processing.
Claim 20
Dependent Claim
187 words
A trunk line identification system connected to a transmission line having channels, the trunk line identification system comprising: a line switch part connected to each of the channels; channel processing parts, coupled to said line switch part, for processing signals received from and transmitted to the transmission line via said line switch part; and a switching system, connected to said channel processing parts, switching signals and relaying at least one signal received by a first channel processing part from the transmission line by way of said line switch part to the transmission line by way of said switching system and a second channel processing part, wherein the second channel processing part transmits an identification signal to the first channel processing part by way of said switching system, and said first channel processing part judges whether or not a line is being used as a trunk line based on whether or not the identification signal is detected, each channel processing part includes compression means for subjecting a signal received from and transmitted to the transmission line by way of said line switch part to a predetermined signal processing.
Claim 21
Dependent Claim
74 words
The trunk line identification system as claimed in claim 14, which further comprises control means, coupled to each of said channel processing parts, for controlling compression means of each of the channel processing parts based on outputs of said channel processing parts, said control means bypassing the predetermined signal processing in said first and second channel processing parts when the first channel processing part detects the identification signal from the second channel processing parts.
Claim 22
Dependent Claim
25 words
The trunk line identification system as claimed in claim 10, wherein said second channel processing part generates the identification signal which indicates the second channel.
References Cited (Backward Citations)
US4039758A
Cited
US4090034A
Cited
GB2066624A
Cited
US4277649A
Cited
JPS60263555A
Cited
JPS6315556A
Cited
US4759049A
Cited
JPS63172555A
Cited
US4885780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-07-11 | 1998-01-10 | 1998-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-11 | 2002-01-10 | 2002-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-11 | 2006-01-10 | 2006-07-12 | $7700.00 | Window Closed / Lapsed |