EP0503474A2
Expired / Lapsed
EP
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Routing system for linear add-drop multiplexer
Assignee: Fujitsu Ltd
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Filing: 1992-03-05
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Granted: —
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Expires: 2012-03-05
Abstract
Abstract A routing system for a linear ADM having two drop switches (10, 40) operates to establish paths according to a relatively simple process and to establish paths according to a program that is relatively small in scale and inexpensive to develop. The routing system includes a first selection switch (11) for selecting one of a plurality of channels connected to a first transmission line and for outputting a signal transmitted through the selected channel. A first selector (12) selectively outputs and inhibits the signal transmitted from the first selection switch (11). The first selection switch (11) and the first selector (12) are provided in one of the drop switches (10). A second selection switch (41) selects one of a plurality of channels connected to a second transmission line and outputs a signal transmitted through the selected channel. A second selector (42) inhibits the signal transmitted from the second selection switch (41) when the first selector (12) outputs the signal, and outputs the signal when the first selector (12) inhibits the signal. The second selection switch (41) and the second selector (42) are provided in the other of the drop switches (40). The signals are transmitted from the first and second selectors (12, 42) to a transmitter/receiver for lower signal levels.
Inventors
- 👤 Kazuo c/o FUJITSU LIMITED Takatsu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 23:05
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
224 words
A routing system for a linear add-drop multiplexer having a first drop switch connected to a first transmission line, a second drop switch connected to a second transmission line and a channel switch for lower levels connected to the first drop switch and the second drop switch, comprising: a first selection switch, provided in said first drop switch, for selecting one of a plurality of channels connected to the first transmission line and outputting a first signal transmitted through the selected channel; a first selector, provided in said first drop switch and coupled to said first selection switch, for selectively outputting and inhibiting the first signal transmitted from said first selection switch; a second selection switch, provided in said second drop switch, for selecting one of a plurality of channels connected to the second transmission line and outputting a second signal transmitted through the selected channel; a second selector, provided in said second drop switch and coupled to said second selection switch, for inhibiting the second signal transmitted from said second selection switch when said first selector outputs the first signal, and for outputting the second signal when said first selector inhibits the first signal; and output means, provided in said channel switch, for outputting the first and second signals transmitted from said first and second selectors to a transmitter/receiver for lower signal levels.
Claim 2
Dependent Claim
52 words
A routing system according to claim 1, wherein said routing system is coupled to an external source, further including control means, which can be commanded by the external source and which is connected to said first and second selection switches, for controlling said first and second selection switches to select the channels.
Claim 3
Dependent Claim
56 words
A routing system according to claim 1, wherein said routing system is coupled to an external source, further including control means, which can be commanded by the external source and which is connected to said first and second selectors, for controlling said first and second selectors to selectively output and inhibit the first and second signals.
Claim 4
Dependent Claim
116 words
A routing system according to claim 1, wherein: said first selection switch comprises means for outputting a third signal transmitted through said selected channel and a fourth signal having all data bits set to 0, said first selector comprises means for selecting and outputting one of said third and fourth signals as the first signal, said second selection switch comprises means for outputting a fifth signal transmitted through said selected channel and a sixth signal having all data bits set to 0, and said second selector comprises means for outputting, as the second signal,the sixth signal when said first selector outputs the third signal and the fifth signal when said first selector outputs the fourth signal.
Claim 5
Dependent Claim
15 words
A routing system according to claim 1, wherein said output means comprises an OR gate.
Claim 6
Dependent Claim
18 words
A routing system according to claim 1, wherein each of said signals is of a SONET STS-1 frame.
Claim 7
Dependent Claim
46 words
A routing system according to claim 6, wherein said output means comprises means for selecting and outputting one of the first and second signals outputted by said first and second selectors which has an equipped code added to a byte C2 of said SONET STS-1 frame.
Claim 8
Dependent Claim
25 words
A routing system according to claim 7, wherein said equipped code is not the same as an unequipped code in which all bits are 0.
Claim 9
Dependent Claim
39 words
A routing system according to claim 1, further including demultiplexers connected to said first and second transmission lines and said first and second selection switches, respectively, for applying demultiplexed output signals to said first and second selection switches, respectively.
Claim 10
Dependent Claim
16 words
A routing system according to claim 1, wherein said linear add-drop multiplexer has a cross-connect function.
Claim 11
Dependent Claim
150 words
A routing system according to claim 1, wherein: said first selection switch comprises a plurality of first selection switches and said first selector comprises a plurality of first selectors, said plurality of first selection switches and said plurality of first selectors are assembled as a single block unit, said second selection switch comprises a plurality of second selection switches and said second selector comprises a plurality of second selectors, said plurality of second selection switches and said plurality of second selectors are assembled as a single block unit, said routing system is connected to an external source and further includes: control lines connected to the external source; and control means, which can be commanded by the external source and which is connected to said block units through respective said control lines, for controlling said block units to select the channels in response to a selection signal from said control means.
Claim 12
Dependent Claim
21 words
A routing system according to claim 11, wherein said control means comprises means for establishing paths for said block units, respectively.
Claim 13
Dependent Claim
23 words
A routing system according to claim 11 or 12, further including add switches for selecting add channels from said channels and through channels.
Claim 14
Dependent Claim
47 words
A routing system according to claim 13, wherein said routing system is coupled to an external source, further including control means, which can be commanded by the external source and which is connected to said add switches, for controlling said add switches to select the add channels.
Claim 15
Dependent Claim
220 words
A routing system for a linear add-drop multiplexer connected to first and second transmission lines, comprising: a first drop switch connected to the first transmission line and formed as a single block unit, said first drop switch including: first selection switches, each of which selects a corresponding one of a plurality of channels connected to the first transmission line and outputs a first signal transmitted through the selected channel; and first selectors, respectively coupled to said first selection switches, each of said first selectors selectively outputting and inhibiting the first signal transmitted from the corresponding one of said first selection switches; a second drop switch formed as a single block unit, said second drop switch including: second selection switches, each of which selects a corresponding one of a plurality of channels connected to the second transmission line and outputs a second signal transmitted through the selected channel; and second selectors respectively coupled to said second selection switches, each of said second selectors inhibiting the second signal transmitted from the corresponding one of said second selection switches when a corresponding first selector outputs the first signal, and outputting the second signal when the corresponding first selector inhibits the first signal; and a channel switch including output means for outputting the first and second signals transmitted from said first and second selectors.
References Cited (Backward Citations)
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