Patent EP0013249B1 successfully refreshed from Google Patents.
US5544172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the digital transmission of data
Assignee: GPT Ltd
•
Filing: 1994-04-12
•
Granted: 1996-08-06
•
Expires: 2014-04-12
Abstract
Abstract Timing pointer signals to be transmitted across a synchronous digital hierarcy (SDH) network are transmitted in virtual containers (VC) in a number of fixed stuff bytes which were hitherto unused. In a preferred embodiment two such bytes are used to carry the timing information which allows for up to a sixteen bit code to be provided for the timing pointers.
Inventors
- 👤 Ghani Abbas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:56
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/16; H04J3/1605; H04J3/1611; H04J3/02; H04J3/06; H04J3/062; H04J3/0623
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A method for the digital transmission of data between nodes in a synchronous digital hierarchy (SDH) network, each node including a multiplexer/demultiplexer (MUX) in which the data is multiplexed from or demultiplexed into tributary streams, the network being operative to carry timing pointers, the method comprising the step of: transmitting the timing pointers in virtual containers (VC) in one or more unused fixed stuff bytes.
Claim 2
Independent Claim
65 words
A method for the digital transmission of data between nodes in a synchronous digital hierarchy (SDH) network, each node including a multiplexer/demultiplexer (MUX) in which the data is multiplexed from or demultiplexed into tributary streams, the network being operative to carry timing pointers, the method comprising the step of: transmitting the timing pointers in virtual containers (VC) in one or more unused fixed stuff bytes.
Claim 3
Dependent Claim
33 words
The method as claimed in claim 1, in which the transmitting step is preformed by using two of the fixed stuff bytes in each of the virtual containers to carry the timing pointers.
Claim 4
Dependent Claim
29 words
The method as claimed in claim 1, in which the transmitting step is preformed by deriving timing resolution for use with the timing pointers from an SDH line signal.
Claim 5
Dependent Claim
29 words
The method as claimed in claim 1, in which the transmitting step is performed by carrying the timing pointers in the fixed stuff bytes in positions 2 and 3.
Claim 6
Dependent Claim
41 words
The method as claimed in claim 1, and further comprising the steps of extracting a timing pointer value from the VC, and converting the timing pointer value to a reference value during receipt of a multiplexed data stream at a node.
Claim 7
Dependent Claim
23 words
The method as claimed in claim 5, in which the converting step is performed by using a node reference and a node clock.
Claim 8
Dependent Claim
22 words
The method as claimed in claim 5, and further comprising the step of generating a node timing pointer from the reference value.
Claim 9
Dependent Claim
25 words
The method as claimed in claim 2, and further comprising the step of generating the timing pointers as a code of up to sixteen bits.
References Cited (Backward Citations)
US5091907A
Cited
US5287360A
Cited
US5033044A
Cited
EP0460835A2
Cited
GB2249002A
Cited
US5172376A
Cited
US5331671A
Cited
US5331630A
Cited
GB2260469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-06 | 2000-02-05 | 2000-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-06 | 2004-02-05 | 2004-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-06 | 2008-02-05 | 2008-08-06 | $7700.00 | Window Closed / Lapsed |