WO1999067903A1 - Telecommunication network - Google Patents

Telecommunication network Download PDF

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Publication number
WO1999067903A1
WO1999067903A1 PCT/EP1999/003370 EP9903370W WO9967903A1 WO 1999067903 A1 WO1999067903 A1 WO 1999067903A1 EP 9903370 W EP9903370 W EP 9903370W WO 9967903 A1 WO9967903 A1 WO 9967903A1
Authority
WO
WIPO (PCT)
Prior art keywords
curb
telecommunication network
wide
band signals
local
Prior art date
Application number
PCT/EP1999/003370
Other languages
French (fr)
Inventor
Han Hiong Tan
Original Assignee
Koninklijke Kpn N.V.
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 Koninklijke Kpn N.V. filed Critical Koninklijke Kpn N.V.
Priority to AU41441/99A priority Critical patent/AU4144199A/en
Publication of WO1999067903A1 publication Critical patent/WO1999067903A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/112—Line-of-sight transmission over an extended range
    • H04B10/1123—Bidirectional transmission
    • H04B10/1125—Bidirectional transmission using a single common optical path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H04B10/272—Star-type networks or tree-type networks

Definitions

  • the invention is related to a telecommunication network, comprising an exchange, an intermediary network between the exchange and local distribution/collection stations, hereinafter called curbs, and per curb a local network between the curb and subscriber connections .
  • a local telecommunication network there are two technical possibilities for transmitting wide-band signals, namely FTTH (Fibre To The Home) and ADSL (Asymmetric Digital Subscriber Line). Both techniques have advantages and disadvantages.
  • FTTH Fibre To The Home
  • ADSL Asymmetric Digital Subscriber Line
  • ADSL - via (existing) twisted pair wires - has a limited bit- rate as a disadvantage.
  • FTTC Fibre To The Curb
  • ADSL then only needs to bridge the distance between the curb and the subscriber - this disadvantage can be largely compensated.
  • Each client who desires wide-band can obtain an ADSL connection.
  • the object of the invention is to combine both advantages of FTTH and ADSL.
  • a "fibre to the curb" FTTC
  • this fibre can be installed up to the curb together with the twisted pair.
  • the wide-band signal is transmitted to the subscribers via an infrared transmitter.
  • Subscribers who do not desire wide-band services have only their normal telephone line via the twisted pair connection.
  • Clients who do desire a wide-band service get an optical receiver which can receive the transmitter's signal; therewith, a distance of several hundreds of metres can be bridged.
  • Another advantage is that only costs need to be incurred for the clients who require a wide-band service.
  • a pre-investment in the form of a fibre to the curb and a transmission tower with infrared transmitter is, of course, necessary.
  • An advantage of infrared with respect to radio is that it is much cheaper and does not require transmission licences.
  • the operational reliability is somewhat less than the normal twisted pair of FTTH.
  • the connection can become worse in the event of heavy mist and rain. Since only wide-band services are involved here and the normal telephone (narrow-band) is transported via the twisted pair, this objection can be considered to be acceptable.
  • a second possibility to avoid cross-talk is by modulating a carrier wave with the wide-band signal before it is supplied to the infrared transmitter. By allocating different carrier waves to neighbouring areas (different wavelength, frequency or polarisation), cross-talk is avoided.
  • Fig. 1 shows an example of an embodiment of a telecommunication network according to the invention.
  • an exchange PBX 1
  • the curbs are connected to the exchange by both a conventional, narrow-band twisted pair cable 4 and an optical fibre 5, with which wide-band signals can be transmitted. If desired, the copper cable 4 can be omitted.
  • PBX exchange
  • the copper cable 4 can be omitted.
  • IR (omnidirectional) transmitters 6 are set up, which are supplied by the wide-band signal transmitted by the optical fibre 5.
  • the IR transmitters are situated at locations where there is direct sight to the houses 7 of the subscribers.
  • an IR receiver 8 is installed which receives the IR signal of the transmitter and supplies it to subscriber equipment such as a PC or NC (Network Computer) 9 via an interface which is not shown.
  • Fig. 2 shows in greater detail an IR receiver 8.
  • This is formed by an 0/E converter 12, for example a photodiode, in the focal point of a reflector 12.
  • an 0/E converter 12 for example a photodiode
  • lens 14 for concentrating incoming light, use can also be made of a lens 14; in the figures, both are used.
  • the optical signal of the co-operating transmitter 6, bundled via the lens 14 and reflector 12, is converted into an electrical signal by the photodiode .
  • the upstream traffic also will usually be narrow- banded
  • subscriber locations 7 can thereto be provided with IR transmitters (such as the transmitters 6), while at the curb an IR receiver (such as the IR receivers 8) can be set up.
  • the upstream wide-band traffic can be transmitted via the fibres 5.

Abstract

A telecommunication network, comprising an exchange (1), an intermediary network (2) between the exchange and the curbs (3), and per curb a local network (10) between the curb and subscriber connections. For the transmission of wide-band signals, the local network comprises, at the side of the curb, an optical transmitter (6) and, at the side of the subscribers (7), optical receivers (8) which cooperate with said transmitter. For narrow-band services such as conventional telephony, a conventional copper cable (11) can be used locally if desired.

Description

Telecommunication network .
A. Background of the invention
The invention is related to a telecommunication network, comprising an exchange, an intermediary network between the exchange and local distribution/collection stations, hereinafter called curbs, and per curb a local network between the curb and subscriber connections . In a local telecommunication network there are two technical possibilities for transmitting wide-band signals, namely FTTH (Fibre To The Home) and ADSL (Asymmetric Digital Subscriber Line). Both techniques have advantages and disadvantages. The most important disadvantage of FTTH is that it is (still) expensive and that it is still unknown terrain for operators. Besides that, it must also be mentioned as a disadvantage that FTTH must be installed at one time in a whole area in order to be able to supply wide-band. This is therefore only possible in new construction areas. As an advantage, it can be mentioned that FTTH has an unlimited bandwidth and that it is therefore "future proof".
ADSL - via (existing) twisted pair wires - has a limited bit- rate as a disadvantage. However, in combination with FTTC (Fibre To The Curb) - ADSL then only needs to bridge the distance between the curb and the subscriber - this disadvantage can be largely compensated. As an advantage, it can be mentioned that it does not need to be installed as a whole. Each client who desires wide-band can obtain an ADSL connection.
B. Summary of the invention
The object of the invention is to combine both advantages of FTTH and ADSL. According to the invention, besides the (already existing) twisted pair or not, a "fibre to the curb" (FTTC) is installed for the - often downstream oriented - wide-band services. For new construction, this fibre can be installed up to the curb together with the twisted pair. At the curb, the wide-band signal is transmitted to the subscribers via an infrared transmitter. Subscribers who do not desire wide-band services have only their normal telephone line via the twisted pair connection. Clients who do desire a wide-band service, get an optical receiver which can receive the transmitter's signal; therewith, a distance of several hundreds of metres can be bridged.
An advantage which can mentioned is that the bandwidth is much higher than that of ADSL. An estimate is several hundred MHz. The limitation of the bandwidth is formed by reflections causing multiple- path transmission, with the therewith associated pulse broadening as a result. This problem can be largely prevented by making the receiver directionally sensitive with the aid of a reflector or lens .
Another advantage is that only costs need to be incurred for the clients who require a wide-band service. A pre-investment in the form of a fibre to the curb and a transmission tower with infrared transmitter is, of course, necessary. An advantage of infrared with respect to radio is that it is much cheaper and does not require transmission licences. As a disadvantage, it can mentioned that the operational reliability is somewhat less than the normal twisted pair of FTTH. Among other things, the connection can become worse in the event of heavy mist and rain. Since only wide-band services are involved here and the normal telephone (narrow-band) is transported via the twisted pair, this objection can be considered to be acceptable.
It may happen that neighbouring areas cause cross-talk and thus interference. In cases where this is a problem, this can be avoided by using different light polarity in neighbouring areas . A second possibility to avoid cross-talk is by modulating a carrier wave with the wide-band signal before it is supplied to the infrared transmitter. By allocating different carrier waves to neighbouring areas (different wavelength, frequency or polarisation), cross-talk is avoided.
Since use is made of consumer components (LEDs and infrared receivers such as also used in remote control units), it is plausible that the concept according to the present invention will be economically attractive .
C. Examples of embodiment
Fig. 1 shows an example of an embodiment of a telecommunication network according to the invention. Shown is an exchange (PBX) 1, which is connected by an intermediary network 2 to local distribution/collection stations 3 , called curbs . The curbs are connected to the exchange by both a conventional, narrow-band twisted pair cable 4 and an optical fibre 5, with which wide-band signals can be transmitted. If desired, the copper cable 4 can be omitted. At or near each curb 3, one or - see the uppermost curb in the figure - several IR (omnidirectional) transmitters 6 are set up, which are supplied by the wide-band signal transmitted by the optical fibre 5. The IR transmitters are situated at locations where there is direct sight to the houses 7 of the subscribers. On the outside of the houses, an IR receiver 8 is installed which receives the IR signal of the transmitter and supplies it to subscriber equipment such as a PC or NC (Network Computer) 9 via an interface which is not shown.
Fig. 2 shows in greater detail an IR receiver 8. This is formed by an 0/E converter 12, for example a photodiode, in the focal point of a reflector 12. For concentrating incoming light, use can also be made of a lens 14; in the figures, both are used. The optical signal of the co-operating transmitter 6, bundled via the lens 14 and reflector 12, is converted into an electrical signal by the photodiode .
Finally, although it can be foreseen that for wide-band downstream traffic the upstream traffic also will usually be narrow- banded, it observed that, in cases where in the local network 10 there is nevertheless a need for an upstream wide-band connection, subscriber locations 7 can thereto be provided with IR transmitters (such as the transmitters 6), while at the curb an IR receiver (such as the IR receivers 8) can be set up. In the intermediary network 2, the upstream wide-band traffic can be transmitted via the fibres 5. Such a wide-banded upstream connection in the local network 10, formed by an IR transmitter at the side of a subscriber 7 and an IR receiver at the side of the curb, is diagrammatically shown in Fig. 1 at 15.

Claims

D . Claims
1. A telecommunication network, comprising an exchange (1), an intermediary network (2) between the exchange and local distribution/collection stations, hereinafter called curbs (3), and per curb a local network (10) between the curb and subscriber connections, characterised in that the local network, for the transmission of wide-band signals, comprises, at the side of the curb, an optical transmitter (6) and, at the side of the subscribers (7), optical receivers (8) which co-operate with said transmitter.
2. Telecommunication network according to Claim 1 , characterised in that the intermediary network comprises optical fibres (5) for the transmission of wide-band signals.
3. Telecommunication network according to Claim 2 , characterised in that the intermediary network comprises twisted pair cables (4) for the transmission of narrow-band signals.
4. Telecommunication network according to Claim 1, characterised in that the local network comprises twisted pair cables for the transmission of narrow-band signals.
5. Telecommunication network according to Claim 1 , characterised in that the optical receiver is directionally sensitive by means of a reflector (13) or a lens (14).
6. Telecommunication network according to Claim 1, characterised in that [in] neighbouring local networks of the optical transmitters have mutually differing light polarity.
7. Telecommunication network according to Claim 1 , characterised by modulation means for modulating, on a carrier wave, the wide-band signals which are transmitted from the curb to the subscriber stations, where the wavelength, the frequency or the polarity of the various modulated carrier waves or of the various modulating signals in neighbouring local networks are mutually different.
PCT/EP1999/003370 1998-06-19 1999-05-12 Telecommunication network WO1999067903A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU41441/99A AU4144199A (en) 1998-06-19 1999-05-12 Telecommunication network

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1009443A NL1009443C2 (en) 1998-06-19 1998-06-19 Telecommunication network.
NL1009443 1998-06-19

Publications (1)

Publication Number Publication Date
WO1999067903A1 true WO1999067903A1 (en) 1999-12-29

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Application Number Title Priority Date Filing Date
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Country Status (3)

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AU (1) AU4144199A (en)
NL (1) NL1009443C2 (en)
WO (1) WO1999067903A1 (en)

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