EP0505062A2
Expired / Lapsed
EP
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Multiplex data ring transmission
Assignee: GPT Ltd
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Filing: 1992-03-06
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Granted: —
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Expires: 2012-03-06
Abstract
Abstract A data transmission system in which multiplex data is created in accordance with the synchronous digital hierarchy includes an add-drop multiplex having a switch (9) across which data streams are switched between a pair of multiplexes and each input and output for a stream has a rejustifier circuit (18) the timing of which is extracted from a timing extract (19) from the other side of the switch (9).
Inventors
- 👤 Stephen Patrick Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 17:08
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0635; H04J3/0685; H04J3/0691; H04J3/08; H04J3/085; H04J2203/00; H04J2203/0001; H04J2203/0028; H04J2203/0039; H04J2203/0042; H04J2203/0089
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
A data transmission system in which multiplex data created in accordance with the synchronous digital hierarchy, includes an add-drop multiplex having a switch across which data streams are switched between a pair of multiplexes characterised in that each inpt and output for a stream to be switched has a rejustifier circuit (10), (18) the timing for each output rejustifier circuit (18) being extracted (19) from the other side of the switch (9).
Claim 2
Dependent Claim
19 words
A system according to Claim 1 characterised by including further rejustifier circuits (18) at the outputs to the system.
Claim 3
Dependent Claim
25 words
The system according to Claim 2 characterised in that each of the further rejustifier circuits (18) has a timing extract (19) connected to its input.
Claim 4
Dependent Claim
45 words
A system as claimed in Claim 3 characterised by connecting between the timing extract (19) on one side of a switch (9) to an output rejustifer circuit (18) on the other side of the switch (9) to transfer the timing to establish a timing reference.
Claim 5
Independent Claim
45 words
A system according to any one of Claims 2, 3 or 4 characterised in that the further rejustifier circuits on the output side (18) are of a simpler nature than those of the input rejustifier circuits (10) on the input side of the switch (9).
Claim 6
Independent Claim
75 words
A method of transmitting multiplexed data over a ring in which the data is created in accordance with the synchronous digital hierarchy characterised by providing an add-drop multiplex comprising a switch across which data streams between a pair of multiplexers are switched and in that each input and output for a stream to be switched has a rejustifier circuit. The timing for each output rejustifier circuit being extracted from the other side of the switch.
References Cited (Backward Citations)
No citation records indexed.
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