WO1996019089A1 - Systeme de telecommunications - Google Patents

Systeme de telecommunications Download PDF

Info

Publication number
WO1996019089A1
WO1996019089A1 PCT/GB1995/002924 GB9502924W WO9619089A1 WO 1996019089 A1 WO1996019089 A1 WO 1996019089A1 GB 9502924 W GB9502924 W GB 9502924W WO 9619089 A1 WO9619089 A1 WO 9619089A1
Authority
WO
WIPO (PCT)
Prior art keywords
subscriber
loop
bit rate
transceiver unit
network
Prior art date
Application number
PCT/GB1995/002924
Other languages
English (en)
Inventor
Michael Philip Dyer
Peter John Dyke
Original Assignee
Northern Telecom Limited
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 Northern Telecom Limited filed Critical Northern Telecom Limited
Priority to EP95940380A priority Critical patent/EP0748574A1/fr
Publication of WO1996019089A1 publication Critical patent/WO1996019089A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/24—Testing correct operation
    • H04L1/242—Testing correct operation by comparing a transmitted test signal with a locally generated replica
    • H04L1/244—Testing correct operation by comparing a transmitted test signal with a locally generated replica test sequence generators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0009—Construction using wavelength filters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0015—Construction using splitting combining
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0018—Construction using tunable transmitters or receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0083—Testing; Monitoring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/009—Topology aspects
    • H04Q2011/0096—Tree

Definitions

  • This invention relates to communications systems supporting both voice services and broad band services such as broadcast video and video- on-demand
  • the invention relates to an apparatus and method for providing subscriber access to those services
  • apparatus for coupling a subscriber to a communications network via a subscriber loop
  • the apparatus including a common transceiver unit for coupling to the network and adapted to serve a plurality of subscribers each via a respective subscriber loop, and a subscriber transceiver unit or network termination unit for coupling to the respective subscriber loop and to one or more subscriber terminals, wherein the common transceiver unit and the network termination unit have means for determining a transmission bit rate that can be supported by the loop, and wherein the common transceiver unit and the subscriber transceiver unit are adapted to provide service independent digital communication over the subscriber loop at downstream and upstream bit rates less than or equal to said determined bit rate
  • a method of providing subscriber access to a communications network via a subscriber loop comprising determining a transmission bit rate that can be supported by the loop, and effecting communication in a service independent form over the subscriber loop at downstream and upstream bit rates that are less than or equal to said determined bit rate
  • the technique permits the provision of a wide range of services to a small business or a residential subscriber without the need to replace the conventional twisted pair subscriber loop
  • the subscriber unjt is programmable via the network so that new services and service changes can be introduced without the need to visit the subscriber premises
  • Figure 1 depicts in schematic form a telecommunications network providing subscriber access over a wired subscriber loop
  • FIG. 1 shows in further detail the subscriber access equipment of the network of figure 1
  • FIG. 1 there is shown in schematic form a telecommunications network in which a plurality of services including broad band services are provided over a fibre to the kerb system
  • the network incorporates a trunk network, indicated as a telecommunications network 1 1 , a broadcast/NVOD system 12, broad band services 13, video on demand (VOD) services 14, and a network management system 15 All these services are coupled to a switch node generally depicted as 16
  • This switch node may comprise the head end of a fibre optic distribution system to subscribers
  • the switch node 16 is coupled to a number of primary nodes 17 each typically housed in a street cabinet
  • Each primary node 17 is in turn coupled to a number of street optical network units (ONU) 18 which function as common transceiver units providing an interface between fibre optic transmission in the network and electrical transmission to subscribers
  • Each street ONU 18 distributes digital traffic to a number of subscriber stations 19 over twisted pairs or coaxial drops 20 using a transmission system which is service independent
  • the subscriber station is provided with a network termination unit 21 which receives digital traffic from the ONU 18 over the subscriber loop 20 and transmits digital traffic back across the loop to the ONU
  • the downstream and upstream transmissions may be symmetric or asymmetric
  • the network termination unit may be disposed at the customer premises, in a local street cabinet or adjacent the ONU, and serves via a broad band line card 210 various items of customer equipment such as a telephone set 22, a facsimile machine 23 and, via a set-top box 24, a television receiver 25
  • the unit is controlled by a processor 27 and may be powered, e g from the domestic electricity supply via a power supply 26
  • the street ONU has an optical transmitter 31 and an optical receiver 32 for interfacing with the fibre optic network Electronic transceivers 33 are provided one for each subscriber A multiplexer (MUX) is interfaced between the optical transmitter and receiver and the electronic transceivers 33 Operation of the ONU is controlled by a processor 34 and electrical power is obtained e g from the primary node via a power supply 35
  • the ONU may also provide emergency electrical power to each subscriber over the subscriber loop e g to maintain a basic telephone service in the event of a mains power failure
  • the ONU may provide the sole power source for the subscriber
  • the ONU may also incorporate a test head (not shown) for performing subscriber loop testing
  • the significant power dissipating functions such as ring tone generation, may be provided in the subscriber's network termination unit so that the ONU has a relatively low power dissipation
  • the traffic across the subscriber loop between the ONU and the network termination unit is carried in a service independent format at a bit rate approp ⁇ ate to the nature of the traffic
  • This bit rate may be selected from a set of bit rates comprising e g 1 Mb/s, 5 Mb/s, 10 Mb/s and 25 Mb/s
  • Conversion of the traffic into the form for service independent transmission over the loop and reconversion of signals received over the loop is effected via the ONU and the network termination unit processors which are programmed to perform this function
  • the particular rate to be employed over the loop is agreed between the processors in the network termination unit and the ONU respectively This is determined by transmitting a training sequence, from the ONU across the subscriber loop to the network termination unit at each of the various bit rates
  • a pilot tone is sent from the ONU to the network termination unit immediately prior to transmission of the training sequence to alert the termination unit of the nature of the following transmission
  • This training sequence may be stored in the ONU, or it may be transmitted to the ONU via the fibre network
  • the bit rate to be employed over the loop is notified to the network termination unit processor by the ONU processor.
  • This bit rate is independent of the service required by the subscriber
  • each subscriber loop may be operated at its maximum bit rate irrespective of whether the subscriber requires only a narrow band POTS service or a wide range of broad band services
  • the bit rate can be chosen to match the subscriber's service mix
  • the 1 Mb/s rate could be selected as this can easily accommodate a 64 kb/s voice channel
  • a subscriber requiring e g three video channels could be allocated the 25 Mb/s rate if this rate is available on his subscriber loop
  • the customer network termination unit is software programmed via the network according to the customer service demand thereby obviating the need for engineer access to the customer premises when new services are introduced or when a change in service mix is required
  • the system provides dynamic allocation of both services and bandwidth leading to "service dialtone", and allows equipment in the field and in the customer premises to be independent of service mix This reduces operational costs associated with new service provisioning and customer churn

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Telephonic Communication Services (AREA)

Abstract

Dans un système de télécommunications utilisant la transmission par fibres optiques, les abonnés sont reliés à des unités des réseaux optiques (ONU) de rue par l'intermédiaire de lignes de raccordement à paires torsadées. Le traffic est acheminé sur chaque ligne de raccordement suivant un format numérique indépendant du service, à un débit binaire approprié à la largeur de bande du traffic. Ce dispositif facilite l'introduction de nouveaux services et/ou de modifications dans l'assortiment de services d'un abonné.
PCT/GB1995/002924 1994-12-14 1995-12-14 Systeme de telecommunications WO1996019089A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95940380A EP0748574A1 (fr) 1994-12-14 1995-12-14 Systeme de telecommunications

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9425278A GB2298547B (en) 1994-12-14 1994-12-14 Communications System
GB9425278.0 1994-12-14

Publications (1)

Publication Number Publication Date
WO1996019089A1 true WO1996019089A1 (fr) 1996-06-20

Family

ID=10765960

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/002924 WO1996019089A1 (fr) 1994-12-14 1995-12-14 Systeme de telecommunications

Country Status (3)

Country Link
EP (1) EP0748574A1 (fr)
GB (1) GB2298547B (fr)
WO (1) WO1996019089A1 (fr)

Cited By (163)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0817524A2 (fr) * 1996-06-25 1998-01-07 Siemens Aktiengesellschaft Méthode pour la transmission de signaux d'information dans le raccordement au réseau d'un abonné
EP0949838A2 (fr) * 1998-04-07 1999-10-13 Nortel Networks Corporation Architecture répartie, pour la simplification de l'installation externe d'un système d'accès, basée sur des fibres optiques
US20160248509A1 (en) * 2015-02-20 2016-08-25 At&T Intellectual Property I, Lp Guided-wave transmission device with non-fundamental mode propagation and methods for use therewith
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GB2298547A (en) 1996-09-04

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