Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Patent
1998-04-01
2000-05-30
Smith, Creighton
Telephonic communications
Plural exchange network or interconnection
Interexchange signalling
379207, H04M 700
Patent
active
060699485
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to data communication networks. In particular, the present invention relates to a procedure as defined in the preamble of claim 1 and to a system as defined in the preamble of claim 9 for ensuring emergency communication in an access node connected to a data communication network and having a number of subscriber lines or subscribers connected to it for the connection of terminal equipment to the data communication network. Furthermore, the present invention relates to a procedure for the testing of the emergency communication feature, as defined in the preamble of claim 7.
There are at least two commonly known methods for connecting subscribers to an exchange in a data communication network. In the first method, the subscriber is connected via a subscriber line directly to the exchange or to an access module connected to it. In the second method, the subscriber is connected to an access network, whose access node is connected to the exchange. Open interfaces (V5.1 and V5.2) between an access network and a local exchange are defined in the ETSI (European Telecommunications and Standards Institute) standards of the ETS 300 324 and ETS 300 347 series. V5 interfaces enable subscribers belonging to a physically separate access network to be connected to a telephone exchange using a standard interface. A dynamic concentrator interface V5.2, consistent with the standards ETS 300 347-1 and 347-2, consists of one or more (1-16) PCM (Pulse Code Modulation) cables. One PCM cable comprises 32 channels, each of which with a transfer speed of 64 kbit/s, i.e. 2048 kbit/s in all. The V5.2 interface supports analogue telephones as used in the public telephone network, digital, such as ISDN (Integrated Services Digital Network) basic and system connections as well as other analogue or digital terminal equipment based on semi-fixed connections.
A static multiplexer interface V5.1, consistent with the standards ETS 300 324-1 and 324-2, consists of one PCM cable with a transfer speed of 2048 kbit/s. The V5.1 interface supports the same subscriber types as the V5.2 interface, except for the ISDN system connection.
The terminal equipment can be connected to the access ports of the access node. One or more V5 interfaces can be connected to an access node. The access ports are created in the V5 interface by linking an unambiguous address of each port with a given address of the V5 interface. In the local exchange, this address is created as a V5 subscriber. In other words, each access port has an address which is linked with a V5 address and uses a given time slot or given time slots for signalling to the local exchange.
The purpose of a system for ensuring emergency communication is to make sure that calls to emergency numbers of subscribers connected to an access node can be set up even when the V5 interface between the access node and the exchange is out of order. The V5.1 and V5.2 standards contain no definition of systems for ensuring emergency communication in case of failure. In this situation, the problem is that, at present, all communication, including emergency communication, via a specific V5 interface of a given subscriber is hindered when the V5 interface fails.
One possibility for ensuring emergency communication in case of failure of a V5 interface assigned to a subscriber is to create in the telephone exchange to which the V5 interface is connected a separate emergency address for each subscriber for communication during the failure situation. However, the problem with this system is the high capacity required in the exchange, because in this case the exchange must have a double subscriber address range as compared with the number of subscribers. In addition, such an arrangement would significantly increase the size of the interface database of the access node.
The object of the present invention is to eliminate the problems described above. A specific object of the invention is to present an effective procedure for ensuring emergency communication in an access node in the event of a
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Nokia Telecommunications Oy
Smith Creighton
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