CA2199647A1 - Synchronization of communication devices connected over an asynchronous link - Google Patents

Synchronization of communication devices connected over an asynchronous link

Info

Publication number
CA2199647A1
CA2199647A1 CA 2199647 CA2199647A CA2199647A1 CA 2199647 A1 CA2199647 A1 CA 2199647A1 CA 2199647 CA2199647 CA 2199647 CA 2199647 A CA2199647 A CA 2199647A CA 2199647 A1 CA2199647 A1 CA 2199647A1
Authority
CA
Canada
Prior art keywords
samples
synchronization
communication devices
devices connected
local clock
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2199647
Other languages
French (fr)
Other versions
CA2199647C (en
Inventor
Robert Wood
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitel Networks Corp
Original Assignee
Mitel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitel Corp filed Critical Mitel Corp
Priority to CA 2199647 priority Critical patent/CA2199647C/en
Publication of CA2199647A1 publication Critical patent/CA2199647A1/en
Application granted granted Critical
Publication of CA2199647C publication Critical patent/CA2199647C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/07—Synchronising arrangements using pulse stuffing for systems with different or fluctuating information rates or bit rates
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • 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
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5649—Cell delay or jitter
    • 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
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H04L2012/6445—Admission control
    • H04L2012/6459—Multiplexing, e.g. TDMA, CDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H04L2012/6475—N-ISDN, Public Switched Telephone Network [PSTN]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H04L2012/6481—Speech, voice
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information

Abstract

In a method of establishing communication between synchronous devices over an asynchronous communications channel, each device samples a signal to be transmitted at a rate determined by a local clock. The rate of transmission of samples over the channel is determined by the local clock in each device. At least one of the devices is periodically adjusted to match the rates of transmission and arrival of samples over the channel, for example, by adjusting the frequency of the local clock or by dropping or duplicating samples. With this arrangement there is no need to exchange explicit timing information.
CA 2199647 1997-03-11 1997-03-11 Synchronization of communication devices connected over an asynchronous link Expired - Fee Related CA2199647C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 2199647 CA2199647C (en) 1997-03-11 1997-03-11 Synchronization of communication devices connected over an asynchronous link

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA 2199647 CA2199647C (en) 1997-03-11 1997-03-11 Synchronization of communication devices connected over an asynchronous link

Publications (2)

Publication Number Publication Date
CA2199647A1 true CA2199647A1 (en) 1998-09-11
CA2199647C CA2199647C (en) 2004-01-27

Family

ID=4160142

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2199647 Expired - Fee Related CA2199647C (en) 1997-03-11 1997-03-11 Synchronization of communication devices connected over an asynchronous link

Country Status (1)

Country Link
CA (1) CA2199647C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006053704A1 (en) * 2004-11-18 2006-05-26 National University Of Ireland, Galway Synchronizing multi-channel speakers over a network
CN101217039B (en) * 2008-01-08 2011-11-23 北京中星微电子有限公司 A method, system and device for echo elimination

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006053704A1 (en) * 2004-11-18 2006-05-26 National University Of Ireland, Galway Synchronizing multi-channel speakers over a network
CN101217039B (en) * 2008-01-08 2011-11-23 北京中星微电子有限公司 A method, system and device for echo elimination

Also Published As

Publication number Publication date
CA2199647C (en) 2004-01-27

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20130311