IL104106A

IL104106A - Method of transmission of tele-communication signals

Info

Publication number: IL104106A
Application number: IL10410692A
Authority: IL
Original assignee: Kommunikations Elektronik
Priority date: 1991-12-18
Filing date: 1992-12-15
Publication date: 1996-06-18
Also published as: DE4141725A1; DE4141725C2; AU3025992A; AU654417B2; IL104106A0; CN1075837A; CH684565A5

Description

METHOD OF TRANSMISSION OF SIGNALS TECHNICAL FIELD The Invention relates to a process for transmi communications signals between at least one subscriber and at least one switching centre connected to a telephone the signals are transmitted as digital signals over a between two connecting units associated with the subscriber and the switching and wherein the on the one and the switching on the are connected with the associated connecting unit at least one of which is configured as an analog interface 42 49 BACKGROUND OF THE INVENTION For the German Federal Postal Authorities provide with their integrated data network a net for transmitting data 1n digital net is independent of the telephone For the net is such a Apart from the other data networks with digital transmission are In what the IDN considered as a representative of such The subscriber can connect to the IDN peripheral data units the transmission rate of which may differ in dependence upon the interface a data net terminal unit with a maximum transmission rate oF at the interface according to CCITT But there are also known units having higher transmission rates 64 For a net terminal unit such an In order to be able to transmit the signals of the DEE an in the known method there is interconnected a data net terminating which prepares the signals of the DEEs for For the or the DAG may be a In order to improve the utilization of the copper wires of existing cable it is also known from the to for example subscribers their telephones to one line After the signals are transmitted between a switching centre and the subscribers at a transmission rate 144 The two digitized voice channels are transmitted two channels of 64 each via a line between the subscribers and the switching The remaining D channel with 16 used for control FAX units may be used by the subscribers place of telephone The corresponding system has been denoted by because two analog Interfaces are available on the of the subscriber and on the 2 the two systems described work two separate If a subscriber his and Instruments wishes to use both connected over separate paths to them 1n the known requires relatively high expenditures because separate lines must be out between the switching centre or the switching centres and the SUMMARY OF THE INVENTION the problem underlying the Invention 1s to develop the described process further so that a Instruments can be connected the as well as the telephone over a single According to the the problem solved 1n that at least one of the of the two connecting units configured as a digital the digital on the of the subscriber configured so j that a peripheral data with a digital or output can be connected via a an data net terminating and a data net 1s connected to the digital Interface on the of the j the known transmission 1n following digit voice channels are transmitted 1n both directions a between a subscriber and a switching centre of the telephone used In a simple way for additional connection of data units digital Inputs and To the connecting units of both the subscriber and the switching centre there replaced at least one of the analog by a digital so at the j a running to a at the switching the IDN proper can be connected to the respective j all the units of a subscriber can be connected the existing with the IDN or the telephone of whether they are provided a digital or an analog or The expendi ures for process are low the simplest one converter has to be replaced by a digital matching component 1n the two connecting Since the digital on the designed for connecting a there the additional advantage that greater distances can be bridged between the connecting and the than 1n the case of the X 3 the In the preferred in the two connecting at the digital e interface and the DNAE there employed a transmitting unit using the ISDN transmission technique wherewith the digital signals are converted for transmission over the respective line or the and are One UEI then for one converter in the connecting of the subscriber and of the switching centre GRIEF DESCRIPTION OF THE DRAWINGS The process according to the invention explained reference to the drawings of an There Figures 1 to various circuits the form of block diagrams sing the process according to the Figure a detail of the circuits on an enlarged DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Figure 1 shows essential parts of the known PCM2 These the switching centre VSTF of the telephone a connecting VA connected to the same via an analog a a connecting unit TA and In the telephone or FAX T connected to the analog of the connecting units VA and TA each have a digital Uko 1n addi ion to the analog A to which a DEE connected a h the Uko of the The Uko of the VA connected centre VSTD of the data network The two switching centres VSTF and which are shown as separate centres in the could be integrated in one The DEE for an or a interface according to CCITT a maximum transmission rate of transmission rate is increased to 24 a The data of the DEE can be transmitted via the one digital channel of 64 of the PCM2 system illustrated Figure Since this channel 1s not used to Us full capaci which are fed the could be In the 64 of a channel compare a total transmission rate of 144 The process according to the not limited to this transmission In the circuit shown 1n Figure 2 works 1n the same 4 e n e connec and a digital Interface The Uko Interface of VA Is connected the whereas the VSTF connected to the three Telephones or telecopiers T are connected to the of the TA at the The DEE connected the Uko a DNG and the Here four digital channels with 32 are available at a rate of the When a DAG an input or output of 64 to be used place of the two of the analog are replaced by a digital as per Figure The data of the DEE are transmitted two combined 32 channels to the IDN or vice There remain two analog interfaces for telephones or telecopiers In order to obtain matching of the digital 1n preferred embodiment UEIs are used the connecting units VA and as as the DNG or the DAG as shown Figure 4 for the subscriber The UEI processes the signals two directions of transmission such a way that the arriving signals are processed by the respect ve DNAE and the signals emitted from the DNAE can be transmitted through the L and Z and the When a DEE 1s connected to a the UEI according to Figure 4 has the Data from the DEE at a transmission rate of at most are set on an transmission rate of 24 the DNG by adding envelope and are serially and synchronism accepted by the They are combined three each case and given an additional control The data group obtained way is fitted a time slot on the Uko and thereafter serially In the direction of the data group picked out of a slot the control 1s and the remaining 3 parallel are serially outputted to the After removal of the envelope the received data are available for the DEE at a transmission rate of 5 insufficientOCRQuality

Claims

104,106/2 The claims defining the invention are as follows:

1. A process for transmitting communications signals between at least one subscriber and at least one switching centre connected to a telephone networK, wherewith the signals are transmitted as digital signals over a two-wire line between two connecting units associated with the subscriber and the switching centre, and wherein the subscriber, on the one hand, and the switching centre, on the other,, are connected via two-wire interfaces with the associated connecting unit, at least one of which is configured as an analog interface, characterized in that at least one of the two-wire Interfaces of the two connecting units (VA, TA) is configured as a digital Interface (Uko); the digital interface (Uko) on the side of the subscriber Is configured so that a peripheral data unit (DEE) with a digital Input or output can be connected via a two-wire line with an Interposed data net terminating unit DNAE); and a data net is connected to the digital interface (Uko) on the side of the switching centre.

2. The process according to Claim 1, characterized In that at each digital Interface (Uko) of the two connecting units (VA, TA) and In the data net terminating unit there is interposed a transmitting unit (UEI) by which the signals are converted 1n each of the two directions of transmission and processed for transmission.

3. A process for transmitting communications signals, substantially as hereinbefore described with reference to the accompanying drawings.