Subscriber network arrangement for connecting subscribers to a t

Details Subscriber network arrangement for connecting subscribers to a t Subscriber network arrangement for connecting subscribers to a t

1996-05-08

1998-05-19

Marcelo, Melvin

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

370524, 348 12, 455 51, H04L 522, H04Q 1104

Patent

active

057545553

DESCRIPTION:

BRIEF SUMMARY
This application claims benefit of international application PCT/FI94/00258, filed Jun. 15, 1994 and published as WO95/01019, Jan. 5, 1995.


BACKGROUND OF THE INVENTION

The invention relates to a subscriber network arrangement, which is the part of a telecommunication network which is intended for a subscriber. Such a part of the telecommunication network is often called an access network.
At the construction of a telephone network in a traditional manner, a separate two-wire line has to be drawn from each subscriber to a subscriber exchange or to a subscriber multiplexer. The construction costs caused only by the exchange and possibly by a connection lead of the subscriber multiplexer as well as by the multiplexing circuits can then be divided among all subscribers. A big problem for a new telephone operator (such are generated particularly because telecommunication legislation is becoming more liberal than before) is thus how to construct a network at substantially lower costs to make it competitive with the networks maintained by already existing telephone operators.


SUMMARY OF THE INVENTION

Accordingly, the object of the present invention is to provide a network arrangement, by means of which the above object can be achieved and by means of which the already existing transmission capacity can be utilized as well as possible at the same time. This is achieved by means of a point-to-multipoint network arrangement.
The idea of the invention is to provide telephone services as a point-to-multipoint network by means of a plurality of subscriber terminals and a common central unit implementing exchange interface and to generate in such a multipoint system a common message-based transmission channel in a transmission frame to be used on a transmission path common to all subscriber terminals between the central unit and the subscriber terminals as well as to transmit all messages to be transmitted in the system on such a message-based transmission channel.
Thanks to the solution of the problem, as provided by the invention, the transmission capacity already available can be utilized as efficiently as possible each time. The system can also be made flexible, since it allows, besides a transmission of all necessary control messages on the same channel, also an easy implementation of concentration, for instance. Through combining the different needs of message transmission into one single group of messages, efficient signalling as to transmission capacity will be possible, for example, and the equipment required will be cheaper and simpler than before, without anything from the flexibility getting lost which is offered as such if the different needs of signalling are kept apart.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention and its preferred embodiments will be described below in more detail with reference to the examples according to the attached drawings, in which;
FIG. 1 shows a subscriber network according to the invention,
FIG. 2a shows a frame structure to be used for downlink connections in the network according to the invention,
FIG. 2b shows bits to be transmitted in time slots TS0 of consecutive frames of one multiframe for downlink connections,
FIG. 3 shows a structure of a signalling message to be used for downlink connections,
FIG. 4a shows a frame structure to be used for uplink connections in the network according to the invention,
FIG. 4b shows a burst to be sent in a message transmission time slot of the uplink frame structure,
FIG. 5a shows a block diagram of a structure of a central unit common to the subscribers of the network,
FIG. 5b shows an alternative manner of implementing exchange interface,
FIG. 6 shows a block diagram of a subscriber terminal of one subscriber,
FIG. 7 shows an application of the solution according to the invention to a cable television network, and
FIG. 8 shows an application of the solution according to the invention to a passive optical subscriber network.


DETAILED DESCRIPTION

FIG. 1 shows a subscriber network according to the invention, implemented by

REFERENCES:
patent: 4773065 (1988-09-01), Kobayashi et al.
patent: 5027426 (1991-06-01), Chiocca, Jr.
patent: 5124980 (1992-06-01), Maki
patent: 5367522 (1994-11-01), Otani
patent: 5581555 (1996-12-01), Dubberly et al.

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