SE9602823L - A method, a device and a network to recover the clock - Google Patents
A method, a device and a network to recover the clockInfo
- Publication number
- SE9602823L SE9602823L SE9602823A SE9602823A SE9602823L SE 9602823 L SE9602823 L SE 9602823L SE 9602823 A SE9602823 A SE 9602823A SE 9602823 A SE9602823 A SE 9602823A SE 9602823 L SE9602823 L SE 9602823L
- Authority
- SE
- Sweden
- Prior art keywords
- frequency
- adjusted
- network
- arrival
- inter
- Prior art date
Links
- 238000000034 method Methods 0.000 title abstract 2
- 238000011084 recovery Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/091—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector using a sampling device
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
- H03L7/181—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a numerical count result being used for locking the loop, the counter counting during fixed time intervals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/062—Synchronisation of signals having the same nominal but fluctuating bit rates, e.g. using buffers
- H04J3/0632—Synchronisation of packets and cells, e.g. transmission of voice via a packet network, circuit emulation service [CES]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5614—User Network Interface
- H04L2012/5616—Terminal equipment, e.g. codecs, synch.
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5672—Multiplexing, e.g. coding, scrambling
- H04L2012/5674—Synchronisation, timing recovery or alignment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5678—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management
- H04L2012/5681—Buffer or queue management
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Computer Hardware Design (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The present invention relates to a method, an apparatus and a network for recovery of the clock of a constant bit-rate service transported over a packet-switched network. The invention measures the inter-arrival time, Wn, between consecutive packages, filter the results through a noise reduction function (27, 52) and calculates a mean value (28) of the inter-arrival times. If the derivative (38) of the mean values is less than an error level (39) for a specified number of times (42), the frequency (18) with which the arrival buffer is polled is adjusted to comply with the frequency with which the CBR service is sent. Whenever the frequency (18) is adjusted a new period for the calculation of the mean values is started. To be able to react faster at start-up, the error level is reduced down to a specified minimum level (45) when the frequency is adjusted.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9602823A SE9602823L (en) | 1996-07-19 | 1996-07-19 | A method, a device and a network to recover the clock |
PCT/SE1997/001168 WO1998004063A2 (en) | 1996-07-19 | 1997-06-27 | A method and an apparatus for recovery of the clock of a constant bit-rate service |
AU35636/97A AU3563697A (en) | 1996-07-19 | 1997-06-27 | A method, an apparatus and a network for clock recovery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9602823A SE9602823L (en) | 1996-07-19 | 1996-07-19 | A method, a device and a network to recover the clock |
Publications (2)
Publication Number | Publication Date |
---|---|
SE9602823D0 SE9602823D0 (en) | 1996-07-19 |
SE9602823L true SE9602823L (en) | 1998-01-20 |
Family
ID=20403436
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9602823A SE9602823L (en) | 1996-07-19 | 1996-07-19 | A method, a device and a network to recover the clock |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU3563697A (en) |
SE (1) | SE9602823L (en) |
WO (1) | WO1998004063A2 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2094201A (en) * | 1999-12-13 | 2001-06-18 | Broadcom Corporation | Voice gateway with downstream voice synchronization |
US7027424B1 (en) | 2000-05-24 | 2006-04-11 | Vtech Communications, Ltd. | Method for avoiding interference in a digital communication system |
GB2401764B (en) * | 2001-01-03 | 2005-06-29 | Vtech Communications Ltd | System clock synchronisation using phase-locked loop |
GB0100094D0 (en) | 2001-01-03 | 2001-02-14 | Vtech Communications Ltd | System clock synchronisation using phased-lock loop |
DE10232988B4 (en) * | 2002-07-19 | 2007-11-22 | Infineon Technologies Ag | Method and device for the clocked output of asynchronously received digital signals |
WO2009010891A1 (en) * | 2007-07-17 | 2009-01-22 | Nxp B.V. | A method and a device for data sample clock reconstruction |
US8401007B2 (en) * | 2009-04-06 | 2013-03-19 | Avaya Inc. | Network synchronization over IP networks |
US8238377B2 (en) | 2009-04-06 | 2012-08-07 | Avaya Inc. | Network synchronization over IP networks |
WO2010141514A2 (en) * | 2009-06-01 | 2010-12-09 | Bit Cauldron Corporation | Method of stereoscopic synchronization of active shutter glasses |
GB201002217D0 (en) | 2010-02-10 | 2010-03-31 | Zarlink Semiconductor Inc | Clock recovery method over packet switched networks based on network quiet period detection |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2682244B1 (en) * | 1991-10-04 | 1995-01-13 | Cit Alcatel | SYNCHRONIZATION DEVICE FOR THE END EQUIPMENT OF A DIGITAL TELECOMMUNICATIONS NETWORK WITH TRANSFER IN ASYNCHRONOUS MODE. |
US5425061A (en) * | 1993-06-07 | 1995-06-13 | Texas Instruments Incorporated | Method and apparatus for bit stream synchronization |
JPH0766814A (en) * | 1993-08-24 | 1995-03-10 | Anritsu Corp | Atm clock regeneration equipment |
NL9401525A (en) * | 1994-09-21 | 1996-05-01 | Nederland Ptt | Clock recovery for ATM receiver. |
-
1996
- 1996-07-19 SE SE9602823A patent/SE9602823L/en not_active Application Discontinuation
-
1997
- 1997-06-27 AU AU35636/97A patent/AU3563697A/en not_active Abandoned
- 1997-06-27 WO PCT/SE1997/001168 patent/WO1998004063A2/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO1998004063A2 (en) | 1998-01-29 |
WO1998004063A3 (en) | 1998-03-12 |
SE9602823D0 (en) | 1996-07-19 |
AU3563697A (en) | 1998-02-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NAV | Patent application has lapsed |
Ref document number: 9602823-8 |