GB2298547A - Communciations system - Google Patents

Communciations system Download PDF

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Publication number
GB2298547A
GB2298547A GB9425278A GB9425278A GB2298547A GB 2298547 A GB2298547 A GB 2298547A GB 9425278 A GB9425278 A GB 9425278A GB 9425278 A GB9425278 A GB 9425278A GB 2298547 A GB2298547 A GB 2298547A
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GB
United Kingdom
Prior art keywords
subscriber
network
loop
transceiver unit
unit
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
GB9425278A
Other versions
GB9425278D0 (en
GB2298547B (en
Inventor
Michael Philip Dyer
Peter John Dyke
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.)
Nortel Networks Ltd
Original Assignee
Northern Telecom Ltd
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 Ltd filed Critical Northern Telecom Ltd
Priority to GB9425278A priority Critical patent/GB2298547B/en
Publication of GB9425278D0 publication Critical patent/GB9425278D0/en
Priority to PCT/GB1995/002924 priority patent/WO1996019089A1/en
Priority to EP95940380A priority patent/EP0748574A1/en
Publication of GB2298547A publication Critical patent/GB2298547A/en
Application granted granted Critical
Publication of GB2298547B publication Critical patent/GB2298547B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/24Testing correct operation
    • H04L1/242Testing correct operation by comparing a transmitted test signal with a locally generated replica
    • H04L1/244Testing correct operation by comparing a transmitted test signal with a locally generated replica test sequence generators
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q11/0067Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005Switch and router aspects
    • H04Q2011/0007Construction
    • H04Q2011/0009Construction using wavelength filters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005Switch and router aspects
    • H04Q2011/0007Construction
    • H04Q2011/0015Construction using splitting combining
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005Switch and router aspects
    • H04Q2011/0007Construction
    • H04Q2011/0018Construction using tunable transmitters or receivers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q2011/0079Operation or maintenance aspects
    • H04Q2011/0083Testing; Monitoring
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q2011/009Topology aspects
    • H04Q2011/0096Tree

Landscapes

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

Description

2298547 1 COMMUNICATIONS SYSTEM 1 This invention relates to communications
systems supporting both voice services and broad band services such as broadcast video and videoon- demand. In particular, the invention relates to an apparatus and 5 method for providing subscriber access to those services.
A wide range of narrow band and broad band services are currently available via telecommunications networks. The provision of these services has been greatly facilitated by the introduction of fibre in the loop (FITL) to support these services on a wide band optical carrier. At present these services are generally limited to larger business premises where it is economic to provide a direct fibre connection to the network. However, in numerical terms the large majority of subscribers are either residential or are small business subscribers with a single line or only a small number of lines. these subscribers are coupled to the network via conventional twisted pair subscriber loops and it is generally considered to be uneconomic to replace these wired loops in the foreseeable future with the optical fibre connections that could carry the various services. There are the additional problems that different subscribers will require different services; some may require only a basic POTS service. Also, as service churn introduces new services and modifies current services, there is a potential added cost to the carrier in the introduction of new equipment and the constant need to change equipment to accommodate different service requirements. One approach to this problem has been the introduction of the service adaptive subscriber line card. However, these devices are relatively costly in terms of hardware investment and in engineer time to effect the necessary installation, and can be rendered obsolete by the introduction of new services which are outside the current service adaptive line card capabilities and/or when the subscriber changes his/her service requirements.
It is an object of the invention to minimise or to overcome these 5 disadvantages.
A further object of the invention is to provide a cost-effective network access to a subscriber via a wired subscriber loop.
According to one aspect of the invention there is provided apparatus for coupling a subscriber to a communications network via a wired 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, 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 determined by said transceiver units.
According to another aspect of the invention there is provided a method of providing subscriber access to a communications network via a wired subscriber loop, wherein there are transceiver units one at each end of the loop, the method comprising effecting communication in a service independent digital form over the subscriber loop at downstream and upstream bit rates determined by said transceiver units.
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.
Advantageously, the subscriber unit is programmable via the network so that new services and service changes can be introduced without the need to visit the subscriber premises.
Reference is here directed to our copending applications No.9408582.6 and No.9419866.0 which relate to the provision of voice and broad band services in a communications network.
An embodiment of the invention will now be described with reference to the accompanying drawing in which- Figure 1 depicts in schematic form a telecommunications network providing subscriber access over a wired subscriber loop; and Figure 2 shows in further detail the subscriber access equipment of the network of figure 1.
Referring to figure 1, there is shown in schematic form a telecommunications network in which a plurality of services including broad band services are provided over a file to the Kerb system. Typically the network incorporates a trunk network identity, a telecommunications network 11, a broadcastINVOID system 12, broad band services 13 and 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 ONUs 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 distributes signals to subscriber stations 19 over twisted pair or coaxial drops 20 using a digital transmission system which is service independent.
Referring now to figure 2, the subscriber's end of the network is shown in further detail. The subscriber station is provided with a network termination unit 21 which receives digital signals from the ONU 18 over the subscriber loop 20 and transmits digital signals back across the loop to the ONU. The network termination unit disposed at the customer premises may serve, 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. 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. In some applications, the ONU may provide the sole power source for the subscriber.
The traffic across the subscriber loop between the ONU and the network termination unit is carried in a service independent digital format at a bit rate appropriate 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. The particular rate to be employed is agreed between the processors in the network termination unit and the ONU respectively. Thus, for a subscriber requiring only a POTS service, the 1 Mb/s rate could be selected as this can easily accommodate a 64 kb/s voice channel. On the other hand, a subscriber requiring e.g. three video channels could be allocated the 25 Mb/s rate. Advantageously, 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.
1 -5.

Claims (8)

CLAIMS:-
1. Apparatus for coupling a subscriber to a communications network via a wired 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, 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 determined by said transceiver units.
2. Apparatus as claimed in claim 1, wherein operation of the common transceiver unit and the subscriber transceiver unit are controlled each via a respective processor.
3. Apparatus as claimed in claim 1 or 2, wherein the subscriber transceiver unit is programmable via the network.
4. Apparatus as claimed in claim 1, 2 or 3 wherein the common transceiver unit incorporates means for supplying electrical power to the subscriber transceiver unit across the subscriber loop.
5. Apparatus for coupling a subscriber to a telecommunications network substantially as described herein with reference to and as shown in the accompanying drawings.
6. A method of providing subscriber access to a communications network via a wired subscriber loop, wherein there are transceiver units one at each end of the loop, the method comprising effecting communication in a service independent digital form over the subscriber loop at downstream and upstream bit rates determined by said transceiver units.
7. A method as claimed in claim 6, including providing each subscriber with a network termination unit and programming that unit via the network.
8. A method of providing subscriber access to a communications network substantially as described herein with reference to and as shown in the accompanying drawings.
GB9425278A 1994-12-14 1994-12-14 Communications System Expired - Fee Related GB2298547B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB9425278A GB2298547B (en) 1994-12-14 1994-12-14 Communications System
PCT/GB1995/002924 WO1996019089A1 (en) 1994-12-14 1995-12-14 Communications system
EP95940380A EP0748574A1 (en) 1994-12-14 1995-12-14 Communications system

Applications Claiming Priority (1)

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

Publications (3)

Publication Number Publication Date
GB9425278D0 GB9425278D0 (en) 1995-02-08
GB2298547A true GB2298547A (en) 1996-09-04
GB2298547B GB2298547B (en) 1998-12-16

Family

ID=10765960

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9425278A Expired - Fee Related GB2298547B (en) 1994-12-14 1994-12-14 Communications System

Country Status (3)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2320643A (en) * 1996-12-23 1998-06-24 Dsc Telecom Lp Network access adapter
US6600815B1 (en) 1996-12-23 2003-07-29 Alcatel Usa Sourcing, L.P. Telephone network access adapter

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WO1996019089A1 (en) 1996-06-20
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EP0748574A1 (en) 1996-12-18

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