US5144297A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital cross connection apparatus
Assignee: Fujitsu Ltd
•
Filing: 1991-01-03
•
Granted: 1992-09-01
•
Expires: 2011-01-03
Abstract
Abstract A cross connection apparatus which performs cross connection using divided VT signals, as cross connection units, obtained by division of the VT sizes foming virtual tributary (VT) signals of input side transmission line signals into whole integers by a predetermined common size unit, wherein it is possible to perform cross connection by common hardware even if a plurality of types of VT signals having different VT sizes are input.
Inventors
- 👤 Katsuichi Ohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:51
CPC Classifications
H; H04; H04L; H04L49/00; H04L49/10; H04L49/104; H04J; H04J3/00; H04J3/16; H04J3/1605; H04J3/1611; H04Q; H04Q11/00; H04Q11/04; H04Q11/0407
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
132 words
A digital connection apparatus comprising: a switch unit which performs a cross connection; an input side interface unit which is provided at an input side of the switch unit and receives a plurality of input side transmission line signals composed of two or more types of virtual tributary (VT) signals; and an output side interface unit which is provided at an output side of the switch unit and transmits signals which have been cross connected by the switch unit as a plurality of output side transmission line signals, wherein the switch unit is operative to divide the virtual tributary (VT) sizes of the input side transmission line signals into whole integers by predetermined common size unit and perform the cross connection using the resultant divided VT signals as a cross connection unit.
Claim 2
Dependent Claim
132 words
A digital connection apparatus comprising: a switch unit which performs a cross connection; an input side interface unit which is provided at an input side of the switch unit and receives a plurality of input side transmission line signals composed of two or more types of virtual tributary (VT) signals; and an output side interface unit which is provided at an output side of the switch unit and transmits signals which have been cross connected by the switch unit as a plurality of output side transmission line signals, wherein the switch unit is operative to divide the virtual tributary (VT) sizes of the input side transmission line signals into whole integers by predetermined common size unit and perform the cross connection using the resultant divided VT signals as a cross connection unit.
Claim 3
Dependent Claim
46 words
An apparatus as set forth in claim 1, wherein the numbers of bytes of the common size are determined to be the numbers equal to one of the common divisors obtained when dividing the number of bytes of the VT sizes by whole integers without reminders.
Claim 4
Dependent Claim
28 words
An apparatus as set forth in claim 1, wherein the greatest common divisor among said common divisors is set as the number of bytes of the common size.
Claim 5
Dependent Claim
68 words
An apparatus as set forth in claim 2, wherein in said input side interface unit, unique additional signals are attached to each of the divided VT signals and the results are input to the switch unit and in said output side interface unit, the VT signals are reconstructed in accordance with the content of the additional signals and then the resultant output side transmission line signal is output.
Claim 6
Dependent Claim
39 words
An apparatus as set forth in claim 4, wherein the content of said additional signals is at least a frame synchronization information used when reconstructing the output VT signal and a division number information showing the order of division.
Claim 7
Dependent Claim
41 words
An apparatus as set forth in claim 5, wherein the content of said additional signals includes path identification information showing which one of the plurality of cross connection paths formed in said switch unit said divided VT signals must pass through.
Claim 8
Dependent Claim
54 words
An apparatus as set forth in claim 3, wherein said VT signal is a signal based on the SONET specifications and the value of the integer is "36" when at least two types of the North American specification signals (VT1.5, VT3, or VT6) and CEPT specification signals (VT2) are mixed as said VT signals.
Claim 9
Dependent Claim
65 words
An apparatus as set forth in claim 4, wherein said input side interface unit has a division means for dividing the input side transmission line signal by an amount corresponding to the number of the above integers and said output side interface unit has a combining means for combining the plurality of divided VT signals from the switch unit to reconstruct the output VT signal.
Claim 10
Dependent Claim
24 words
An apparatus as set forth in claim 8, wherein said division means cooperates with an additional signal generating means for generating the additional signals.
Claim 11
Dependent Claim
29 words
An apparatus as set forth in claim 8, wherein said combining means cooperates with a combining controlling means for a combining control in accordance with the above additional signal.
Claim 12
Dependent Claim
41 words
An apparatus as set forth in claim 10, wherein said combining controlling means further cooperates with a separating means for separating the additional signals from the corresponding divided VT signals and inputting the separated divided VT signals to the combining means.
References Cited (Backward Citations)
US4670627A
Cited
JPS644131A
Cited
JPH01101747A
Cited
US4967405A
Cited
US4998242A
Cited
US5040170A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |