FI104455B - Procedure for securing emergency communication in a chained V5 connection - Google Patents

Description

104455 METHOD FOR EMERGENCY TRAFFIC OPERATION ON THE CHAINED V5 INTERFACE

The present invention relates to a method for verifying emergency traffic in a V5 linked network, as defined in the preamble of claim 1, in particular when the V5 connection between the telephone exchange and the access network element is malfunctioning.

The V5 interface standards ETS 300 324 and ETS 10 300 347 describe the interface and functionality between a local exchange and a local area network in each network element. A local area network is a part of a local area network that includes local loops. Thus, the subscribers and the subscriber lines may be connected either directly to the exchange 15 (direct subscribers) or through various multiplexers and / or hubs. V5 interfaces allow physically separate subscriber network subscribers to be connected to a local exchange using a standard interface.

20 The V5.2 dynamic hub connection according to standard series ETS 300 347 consists of one or more! : .I. (1-16) on a PCM (Pulse Code Modulation) cable. The single PCM cable has a total of 32 time slots, or channel / '·, each with a rate of 64 kbit / s, or a total of' '. 25 2048 kbps. The V5.2 interface supports analogue public telephone networks, digital, such as ISDN (Integrated Services Digital Network) basic and system interfaces, and other analogue or digital semi-fixed terminal 30 devices.

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* Static I according to standard series ETS 300 324

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~ The V5.1 multiplexer interface consists of a single PCM cable of 2048 ··· kbit / s. This V5.1 interface supports the same broadband types except the ISDN system interface as the V5.2 interface.

The terminals can be connected to the access ports of the access network:: ../ test element. One or more V5 interfaces can be connected to one LAN unit 1 2 104455. Subscriber ports are created on the V5.1 interface by associating the unique address of each port with a specific address on the V5.1 interface. In Local Central, this address is created as a V5 subscriber. In other words, each subscriber port has a unique address, coupled to a V5.1 address, that uses a specific time slot (analog subscribers) or 10 specific time slots (ISDN subscribers) for traffic to the local exchange. Also in the V5.2 interface, each subscriber port has a unique address, but the signaling to the local exchange uses dynamically allocated time slots or time slots. This means that the BCC protocol (Bearer Channel

Control) book slots to be used per call.

The purpose of V5 standardization is to provide an open interface between a local exchange and a local area network 20. However, within the access network, the interface between the access: test element and the subscribers is not: defined. Thus, subscribers become a problem

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connection to the access network element, for example, by means of a static hub connection. A further problem, especially in a multi-vendor environment, is that different. • vendor solutions for centralizing subscribers to a broadband • • network differ significantly, leaving operators with limited choice of equipment suppliers.

30 The purpose of emergency traffic certification is: **. Recognizes calls to emergency numbers connected to the access network element when the V5 connection between the access network element and the telephone exchange is malfunctioning. V5.2 standards do not define * 35 emergency restraints for breakage; * 'Ty, and not particularly when the two V5. · * · Interfaces are concatenated. The problem then arises is that traffic currently passing through a predetermined V5 interface of a particular subscriber, including emergency traffic, is prevented when that V5 interface fails.

It is an object of the present invention to eliminate the above problems. In particular, it is an object of the present invention to provide a method for securing emergency calls to subscribers even in the event of failure of the V5 interface between the access network element and the telephone exchange.

10 With respect to the features of the present invention, reference is made to the claims.

A method for providing emergency traffic in a communication system comprising a telephone exchange having a plurality of subscribers, a subscriber network 15 connected to the telephone exchange by a first V5 interface, including a first access network test element, a second access network element connected to a telephone exchange, and a subscriber terminal. 20 and / or through a hub.

According to the invention, the second T-wide network element is connected to the first access network element by a second V5 interface, whereby the connection between the subscriber and the · '·' telephone exchange (LE) is established by concatenating two V5 connections. The first subscriber ·, · network element is preferably connected via a V5.2- • ♦ interface to the telephone exchange and the second subscriber network element is connected to the first access network element via a V5.1 interface.

Further according to the invention, when a disconnection of the first V5 • · · connection is detected at the beginning of the call set-up, a call from the terminal to the emergency number is combined to be responsible for the emergency traffic of the terminal. . 35, which forwards the emergency call. Preferably, the emergency call is a call to a predetermined emergency telephone number of 4 104455. The process responsible for emergency traffic disruption switches the subscriber to a dial tone or the like and analyzes the selection the subscriber sends. If the selection leads to a predefined emergency number, the process will make the necessary connections. Otherwise, a bulletin or the like will be attached to the subscriber.

In a preferred embodiment of the invention, the emergency communication process directs a call to the first emergency and network element to the pre-established emergency connection locally. In practice, the first access node element monitors the state of the V5 interface 15 used by the terminal to enter a new connection or call and enters a predetermined set up connection state where the connection is established locally from the first state and the network element if it is detected that the V5 connection is the emergency number.

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In a preferred embodiment of the present invention, the first V5 connection is only allowed to make .V calls to the emergency number in the event of a breakdown. Other call attempts are answered by providing the subscriber with an information message, a beep or * «. such as when normal call setup fails.

The invention will now be described, by way of example, with reference to the accompanying drawing, which illustrates one of the present invention. an information system advantageous to the method of the invention.

The communication system shown in the drawing comprises two local exchanges LE (1), LE (2) 35 and a subscriber station ·, respectively, connected to the local exchanges; · Network elements AN1 (1), ANI (2). In this example, the subscriber network elements are connected to local exchanges • - «104455 by V5.2 interfaces V5. As shown in the figure, one local area network element ANI can be connected to multiple local exchanges, allowing the subscriber to be easily transferred to another local exchange by access control commands at the local exchange LE. In addition, the system includes a plurality of other access network elements or multiplexers AN2 connected to the local exchange LE via the access network elements AN1. The multiplexer AN2 is connected to the access node ANI by a second V5 interface, which is a V5.1 interface V5 '. Further, in the example of Figure 1, the subscriber terminal TE is connected to a local exchange via a multiplexer AN2 and a first access node AN1. The access network AN 15 consists of the access terminal TE, the multiplexer AN2, the first access network element AN1 and the lines connecting them.

By way of example, the emergency subscriber interface TE1 is connected to the access node ANI (2) to which an emergency call from the subscriber TE can be connected in the event of a loss of the first 20 V5 interfaces. In practice, this: is performed such that a 3 layer according to the OSI (Open System Interconnection) model of the first access node ANI (2) examines whether the V5.2 interface is V5; ·, 25 when in a call trying to connect. If V5.2-. If the interface is not working properly, the messages are forwarded to the process responsible for this traffic.

If it is detected that the subscriber is trying to make a call to a number other than the emergency number, 30 the call is prevented and the subscriber is notified of an information or tone. If it is detected that the subscriber is trying to make a call to the emergency number, then according to one embodiment of the invention, the call is connected locally to the emergency connection TE1 established in the access node ANI (2) 35. This emergency interface can be: ·: · separately monitored when a breakdown is detected that may cause blocking to subscribers connected to the access node 6 104455 ANI (2). Another solution corresponding to the basic idea of the invention is to dynamically allocate a channel to the subscriber from another V5.2 interface connected to the first ti-5 wide area network element ANI (2).

It should also be noted that the V5 interfaces shown in the communication system depicted in the drawing are started independently. Preferably, the connections are initiated according to standard V5-10 specifications. In addition, it is noted that a system according to the drawing can be implemented as a so-called. a management network which is connected to the local exchange LE, the first and second access node elements AN1 and AN2. However, this does not elaborate on the structure and operation of the 15 management networks but refers to the V5 standards.

The invention is not limited to the above embodiments only, but many modifications are possible within the scope of the inventive idea defined by the claims.

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Claims (7)

7 104455 A method for providing emergency traffic in a telecommunication system comprising a telephone exchange (LE) having a plurality of subscribers, a state-5 and a network (AN) connected to the telephone exchange by a first V5 interface (V5) and including a first access network element (ANI). a network access element (AN2) connected to a telephone exchange and a subscriber terminal (TE) connected to a local exchange via a access network and / or a hub, characterized in that a second access network element (AN2) is connected to a first t1 wide area network element (AN1). interface, whereby the connection between the subscriber and the telephone exchange (LE) is established by concatenating two V5 interfaces; and that connecting the call from the terminal to the emergency number in the event of a failure of the first V5 interface used by the terminal to the process responsible for the emergency communication of the outage. ,,, 20 A method according to claim 1, characterized in that the process responsible for the emergency traffic 4 * '>' · directs the calls to the first access network element (ANI) I «I to the pre-established emergency connection, directed to the emergency number. ! '\ 25 The method of claim 1 or 2, characterized by monitoring the state of the V5 interface used by the terminal in the first access node (ANI) when establishing a new connection; and ,, 30 proceeds to a predetermined connection set-up * · • * state where the connection is established from the first subscriber »· *. * network element if monitoring indicates that the V5 interface in question is malfunctioning. position. · * 35 A method according to any one of the preceding claims 1 to 8, characterized in that, in the event of a disconnection of the first V5 interface, only calls to the emergency number are allowed. A method according to any one of the preceding claims 1 to 4, characterized in that the subscriber is provided with information, a tone or the like in the event of failure of normal call setup. Method according to one of the preceding claims 1 to 5, characterized in that the call to the emergency number is a call to the telephone number (LE) 10 predefined as an emergency number. Method according to one of the preceding claims 1 to 6, characterized in that the interface between the access network (AN) and the telephone exchange (LE) is a V5.2 interface and between the second access network element (AN2) and the first access network element (ANI). The V5 interface is the V5.1 interface. • «• Il Ml • · 9 104455