Telephonic communications – Plural exchange network or interconnection – Interexchange signalling
Reexamination Certificate
2000-04-18
2001-07-10
Smith, Creighton (Department: 2642)
Telephonic communications
Plural exchange network or interconnection
Interexchange signalling
C379S207030, C379S220010
Reexamination Certificate
active
06259784
ABSTRACT:
The present invention relates to a procedure as defined in the preamble of claim
1
.
An earlier application, FI-973313, by the same applicant presents a telecommunication system that uses a so-called cascaded V5 interface. A number of subscribers are defined in a telephone exchange. A first access node is connected to the telephone exchange via a first V5 interface. A second access node is connected to the first access node via a second V5 interface. A subscriber terminal is connected to the second access node. Thus the connection between the subscriber and the telephone exchange is set up by cascading the two V5 interfaces.
V5 interfaces are defined by the ETS 300 324 and 300 347 standards. A dynamic V5.2 concentrator interface as defined in the ETS 300 347 standard series consists of one or more (1-16) PCM (Pulse Code Modulation) lines. One PCM line comprises 32 time slots or channels, each of which with a transfer rate of 64 kbit/s, i.e. 2048 kbit/s altogether. However, the standard is not exclusively concerned with 2 Mbit/s connections. 1.5 Mbit/s connections are used in the USA, and ITU versions of the V5 standards allow 1.5 Mbit/s connections. 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 subscriber lines as well as other analogue or digital terminal equipment based on semi-fixed connections.
A static V5.1 multiplexer interface consistent with the ETS 300 324 series consists of one 2048 kbit/s PCM line. The V5.1 interface supports the same subscriber types as the V5.2interface except ISDN system lines.
PSTN signalling in a V5 interface always requires national and/or of operator-specific adaptation (so-called PSTN mapping) because of national and/or operator-specific differences in the signalling. Typically, this adaptation includes definitions of the PSTN messages to be used, the encoding of information elements, and ways of using different messages in different signal currents.
In a cascaded V5 interface, the problem is how to accomplish PSTN mapping when the subscriber lines are connected to physically separate access nodes so that an access node through which signalling is transmitted does not necessarily know the properties and limitations of the other access nodes.
The object of the present invention is to eliminate the drawbacks described above.
A specific object of the present invention is to disclose a procedure that enables PSTN mapping to be accomplished without problems in a cascaded V5 interface.
The procedure of the invention is characterised by what is presented in claim
1
.
According to the invention, in a cascaded V5 interface, the signalling sequences and decoding of messages in PSTN mapping are only performed in the telephone exchange and a second access node. The signalling is transmitted transparently via a first access node without the first access node participating in the decoding of the signalling.
The invention has the advantage of simplifying the accomplishment of PSTN mapping in a cascaded V5 interface.
In an embodiment of the procedure, the required routing data in the messages to be transmitted are changed in the first access node.
In an embodiment of the procedure, the second access node is a multiplexer.
In an embodiment of the procedure, the first V5 interface is a V5.2 interface consistent with the ETS 300 347 standard and the second V5 interface is a V5.1 interface consistent with the ETS 300 324 standard.
REFERENCES:
patent: 297 04 615 U1 (1997-06-01), None
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patent: 0 731 618 (1996-09-01), None
patent: 973313 (1997-03-01), None
patent: 93/18598 (1993-09-01), None
patent: 96/34504 (1996-10-01), None
patent: 97/16936 (1997-05-01), None
patent: WO 99/08455 (1999-02-01), None
ETS 300 347-1 Signalling Protocols and Switching (SPS); V interfaces at the digital Local Exchange (LE) V5.2 interface for the support of Access Network (AN) Part 1: V5.2 interface specification, Sep. 1994.
ETS 300 324-1 Signalling Protocols and Switching (SPS); V interfaces at the digital Local Exchange (LE) V5.1 interface for the support of Access Network (AN) Part 1: V5.1 interface specification, Feb. 1994.
Antila Leena
Juntunen Timo
Lallukka Toivo
Lehto Pekka
Liinamaa Olli
Altera Law Group LLC
Nokia Networks Oy
Smith Creighton
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