FI108493B - Updating of subscriber connection - Google Patents

Description

1 108493

Changing the subscriber line

Field of the Invention

The invention relates to changing the type of a subscriber line in a telephone network, where the subscriber line can be an analog PSTN or a digital ISDN or another digital subscriber line.

Technology background

Until the 1980s, each subscriber was connected to a local telephone exchange using a copper pair cable. From the subscriber socket, the twisted-pair cable leads to a crossover bracket, where individual twisted-pair cables from multiple subscribers are connected to a thicker, multi-conductor cable. A plurality of such cables can be further connected in a second crossover field bracket to a cable comprising hundreds, even thousands of wires, which in turn leads to the telephone exchange. The subscriber lines thus form a stellar network whose cables connect at a local exchange. As a result, most telephone operator cables consist of subscriber lines.

With the digitalisation of the telephone network, an attempt has been made to extend the digital network as close to the subscriber as possible. This has led to a basic solution as shown in Fig. 20a1. In it, the individual subscriber wires (i.e., copper paired cables) are connected to a single network element which acts as an access node to the network. In the access node, the AD is converted to the analog signals, after which the samples are multiplexed in a so-called. in a subscriber multiplexer to a PCM lead to a local exchange. Then each one ''. The 25 subscriber lines correspond to their own term with the trunk line. Instead of a multiplexer, a hub can also be used. The access node also performs on-hook / off-hook detection and loop measurements of subscriber • * * * · * · * wires.

v: The subscriber may have an old decent analog connection, so called. POTS (Plain Old Telephone System) interface, allowing him to connect ana: V: 30 logical terminal directly to a 2w subscriber line or via a digital terminal such as a computer modem.

\ (With the popularity of the Internet, the need for faster data transfer has increased and therefore the number of ISDN subscriptions has increased dramatically '·: ·'. Changing the POTS to basic audio and data speed::: 35 den ISDN requires an adapter card at the subscriber line end of the subscriber line «« · 2 108493 and at the subscriber end of the ISDN terminal The basic rate interface is called 2B + D with two 64 kbit / s B channels and one 9.6 kbit / s signaling and control channel D The physical transmission medium is still the same paired cable. The subscriber-side ISDN "modem" usually has an AD converter that can be connected to an analog terminal, in which case one B channel is used for audio voice signal transmission (POTS channel) while the other B channel is used for data transmission. .B channels are bidirectional.

Significantly high data rates of 10 can be achieved using ADSL (Asymmetric Digital Subscriber Line) using the same paired cable. ADSL contains three separate frequency channels with the same 2w pair cable. The lowest frequency channel transmits traditional POTS voice calls. A second uplink channel transmits data from a subscriber terminal over a subscriber line to a network at a rate of 16-500 kbit / s. The third channel is a high-speed downlink channel, for example, for transferring a movie from the web to a consumer. Speeds can range from 1.5 Mbps to 9 Mbps. The subscriber needs an ADSL modem. The prototype modem has three connectors, one for the telephone socket, one for the standard RJ-11 analog terminal connector, and the third is the twisted pair Ethernet Ethernet RJ-45 connector that connects to the computer.

20 The great advantage of ADSL is that it does not use any special adapter electronics for analogue devices, but that the analogue connection works even though the ADSL itself .. ·; the modem would not work either. Due to the high frequency, the length of the subscriber line • may not be very long, at 6 Mbit / s the cable length may be 2.5 -.:. 3 km.

Figure 3 illustrates the frequencies used by the 2w subscriber line when using the transmission methods listed above. In the POTS interface the frequency range is 300 Hz to 3.4 Khz, in the ISDN connection the range is 300 Hz to 80 kHz. The 1.5 * Mbit / s ADSL operates at higher frequencies and has an uplink channel of 85-95 Khz and a downlink channel of 110-410 Khz. I * * 30 women have shown in the figure that the subscriber may have access to the P: T: slanted POTS, ISDN, ISDN with another channel, * transmitted POTS signal, or ISDN and ADSL or POTS and :: ADSL. All this is achieved using a traditional 2w copper cable.

«· 3 108493

Figure 2 illustrates the circuits in the access node in a slightly more detailed manner. Physically, the access node can be located in a building or it can be a "small cabinet across the street. The cabinet has a rack with one or more racks. The rack has plug-in units with the necessary 5 electrical circuits. The individual subscriber lines entering the access node each terminate in its own plug-in unit and a subscriber line interface unit which adapts the subscriber line to the network interface. In Figure 3, therefore, multiple ISDN subscriber lines terminate in an ISDN-10 card. the individual subscriber access circuits, i.e., multiple subscriber lines terminating on the same card, respectively, and the analogue subscriber wires terminate on the POTS matching subscriber access circuits on the POTS cards 22.

The POTS and ISDN plug-in units connect to the backbone 29, to which the network connection unit 210 is also connected. The interface to the local exchange is here V5.2 according to the standard, and the unit 210 connects the access node to the exchange with 2 Mbit / s trunk lines.

In addition, the subscriber node further comprises a test unit 211 which is connected to the Network Management System 20 via the Network Management Interface Q3. The test unit 211 communicates via a separate test bus 28 to the ISDN and POTS subscriber interface circuits 21 and 22. The test unit performs conventional subscriber line loop measurements and sends the results to the network manager.

When subscribers consider their current POTS or ISDN connection too slow for in-25 ternet use, they may require an operator to have an ADSL connection that provides multiple speeds over ISDN. Such a need arises at the latest when more and more commercially available ADSL modems are available to the subscriber line. Therefore, the telecommunications operator may prepare for the deployment of ADSL technology by adding ADSL modems to the existing access node and providing new access nodes with these. Figure 2 illustrates this. It * has a plurality of ADSL modems 27 to which a subscriber line can be connected.

In addition to, or instead of, ADSL technology, one can be prepared for VDSL (Very High Data Rate Digital Subscriber Line) or HDSL (High::: 35 Bit Rate Digital Subscriber Line) using a 2 Mbit / s PCM cable. Charging is shown in Fig. 2 108493 4 by reference as + DSL. ADSL is no longer based on 2 Mbit / s PCM lines and therefore the figure illustrates ADSL connections to a multiplexed 212 proprietary transmission network based e.g. on Synchronous Digital Hierarchy (SDH).

5 Since a traditional POTS connection or an ISDN connection can also be transmitted in an ADSL interface, both a POTS partitioning unit and an ISDN partitioning unit are required at the access node. These splitters are shown at 25 and 26. The difference is simply based on low pass filtering.

Figure 4 illustrates a method used in an access node of the prior art described above to connect subscriber lines to a node. The subscriber lines SL are connected to a node in groups, denoted in the figure by UNIT1 ..... UNIT N. There are n 2 2w copper cable subscribers connected to one group, often 16 pairs of cables (n = 16) are connected. Each subscriber line SL 15 is connected to its own subscriber interface circuit, which is referenced by the term Interface, e.g., the subscriber line SL1 of the UNIT 1 group is connected to the interface circuit 1 (Interface 1). In practice, it is easiest for the subscriber lines in each group to be of the same type, e.g., the UNIT 1 subscriber lines are for POTS subscribers, the UNIT 3 subscriber lines are for ISDN subscribers and the UNIT N subscriber lines are for ADSL subscribers. This does not have to be the case, but different types of interfaces can be associated with the same group.

....: Between each end of the subscriber line and the interface circuit there is a test switch R, which may be a semiconductor switch or a relay for connecting the subscriber line to the test bus or the subscriber interface circuit. The test unit may control the 25-band test relay R individually via the test bus. Normally, the subscriber line is connected to the interface circuit, but if the operator wishes to make loop measurements of that subscriber line, the test unit 211 is remotely commanded. controls the test relay R so that it connects the desired subscriber line to the test bus for the duration of the measurements.

The problem with prior art access nodes as described above is that whenever a subscriber wants to change their subscription type, *. for example, a POTS subscriber wants an ISDN or ADSL connection, or an ISDN subscriber wants an ADSL connection, the installer must go on-site to make the necessary connections. Here, the end of the subscriber line is connected to a new interface circuit: 35 (interface). The on-site upgrade also results in 5,108,493 subscriber switching requests taking time to complete, depending on the operator, days at best, weeks at worst. One way of performing on-site POTS »ISDN switching is described in WO 97/01938.

5 The problem remains the same even if the access node is connected to the local exchange. After one installation is completed, it may be necessary to go to the access node again in a short time to upgrade the subscription of the other subscriber. In the state of the art access nodes, an installer visit is the only way to perform the upgrade.

It is an object of the present invention to solve the above problem.

Specifically, the goal is to perform a subscriber line upgrade without a visit by an installer and almost immediately after the subscriber's switch request.

The object set is solved in the ways defined in the independent claims.

15

BRIEF SUMMARY OF THE INVENTION

The solution according to the invention consists of two parts: a bus and means for connecting the subscriber line to the bus. First, a special switching matrix bus is provided to the access node, which is composed of a plurality of rin-20 contiguous wires, each of which is 2-wire. However, the first type of digital subscriber line, here ISDN, and the second type digital subscriber line, here ADSL, are permanently connected to the bus, but only one first or second type of connection is actively connected to one bus line at a time. .

25 This connection is made in advance.

The basic element of the second section is a controlled switch element, which can connect the wiring from the test relay between the end of the subscriber line and the connection circuit to the switching matrix bus. If several subscriber wires are physically connected to the same card unit so that their test relays are connected to the same conductor conducting the test bus, one controlled switch per group is sufficient, as the switch element is connected to this common conductor connecting the test relays to the test bus.

«· *

The remote control signal provided by the network control selects which * ·; · * and the group test relay connects the associated subscriber line to the test bus: V: 35 to the conductor. The subscriber line is, of course, the subscriber's line that wants to change the subscription type. With the same control, the controllable switch element is turned so that it connects the signal to the test bus to the switch matrix bus and to a predetermined conductor.

On the other hand, since a pair of switch matrix buses, i.e. a pair of wires, is permanently connected to a first type digital subscriber line (ISDN) or second type digital subscriber line (ADSL) interface circuit, it means that the subscriber line can be connected to the original interface circuit. Thus, any one but only one of the group's subscriber lines can be remotely converted to another type of interface.

Because the subscriber node has a large number of subscriber line terminating groups and there may be dozens or hundreds of subscriber lines, the likelihood of a subscriber requesting a change in subscription type is fairly even for all subscriber lines. In this case, the likelihood of two time-varying 15 connection type changes in the same group is relatively small. This in turn means that many changes to the subscriber interface can be done remotely before the installer has to come in to make permanent connections.

20 Pattern list

The invention will be described in more detail with reference to the following schematic drawings, in which Figure 1 illustrates a way of connecting a subscriber line to a telephone network, Figure 2 illustrates the structure of an interface node, Figure 3 shows the location of different types of Fig. 5 shows an interface node with an insertion according to the invention and Fig. 6 shows a connection of the subscriber lines to the connection circuits supplemented with an insertion according to the invention: v: 30.

· »·« * · • · · • *. DETAILED DESCRIPTION OF THE INVENTION

Fig. 5 shows a first section of the solution according to the invention, which is a switch matrix bus 213. As will be seen, Fig. 5 differs from Fig. 35 only in that it has a switch matrix bus 213. This bus is positioned as a backbone bus. The bus is accessed from the ISDN interface circuits 21, the POTS interface circuits 22. In addition, the POTS splitter 25 and the ISDN splitter 26 are connected to the switch matrix bus 213. The switch matrix bus is an analog bus, i.e. no bus clocks exist.

Although the subscriber lines are not directly connected to the additional ISDN and POTS interface circuits 23 and 24, the interface circuits are still connected to a bus 29 through which they, like the interface circuits 21 and 22, have access to the network access unit 210 and further connected to the local exchange. These interface circuits are needed to match the audio frequency or ISDN frequency signal from the ADSL subscriber line to and from there 10

Figure 6 shows the structure of the switching matrix bus better. The fairway is illustrated at the bottom of the figure. In this example, the bus consists of pair wires 1-8. Each bus conductor is a pair conductor because the space-15 conductors are also twisted-pair and the bus conductor forms part of the subscriber conductor as described in more detail below. The switching matrix bus is located on the back panel of the frame as a backbone, and the POTS and ISDN splitters 25 and 26, Fig. 5, connect to the bus through the plugs of the plug unit. The coupling methods are obvious to the person skilled in the art and will not be described further here. Each bus conductor 20 is thus fixedly connected to either the ISDN splitter 26 or the POTS splitter 25.

It is most advantageous to make the switching matrix bus such that the bus conductors are alternately connected to the same splitter. In the figure, bus conductor 1 connects to POTS splitter 25, bus conductor 2 connects to ISDN splitter 26, bus conductor 3 again to POTS splitter, etc. This is not required, but practical 1 to 4. 25 connections are made easier as shown below.

It will be apparent from the foregoing description and Figure 5 that if the bus: · * · 'wire has received a subscriber line signal having an audio or ISDN frequency component, it will pass to a splitter (25 or 26) separating from there, the audio portion for further transmission to the ISDN or POTS interface circuit 23 or 24. From there: the Y: 30 audio or ISDN signal is further provided to bus 29, from where it is routed to the local exchange. Splitters separate the audio frequency and the ISDN signal frequency m *. higher frequencies and lead them to the ADSL interface circuit 27. How to subscribe; ;;; ' and the signal from the line can be routed to the switching matrix bus, the second part of the invention is presented.

s 108493

The second part of the invention thus consists of a solution of how the existing subscriber line can be connected to the switching matrix bus instead of the connection unit originally associated therewith. This solution is explained with reference to Figure 6.

Figure 6 is substantially the same as Figure 4, except that the first section, i.e. the switching matrix bus, of the invention 5 and the second section, or means, for connecting the subscriber line to the switching matrix bus. Reference numerals and designations are, where applicable, identical in the figures. The second section is based on the idea of using existing subscriber line test tools to connect the wire to the switching matrix bus. After all, the subscriber line SL is provided with a test relay R 10 which can be used to connect the subscriber line to the test bus instead of the interface circuit. The test terminals t of the test relays R of the subscriber lines ending in the same group are connected to a common conductor, the other end of which is connected to the test bus.

Consider the group UNIT 1. Because the groups are similar, the description applies to other groups as well. Between its connection to the test bus 15 and the last relay Rn connected to the common lead 41, a common element 41 is provided with a switch element which, depending on its position, connects the common lead 41 either to the test bus or instead to a predetermined switch matrix conductor.

The function of the switching element can be constituted by two relays 20, the first of which relay SE1 connects a common conductor 41 to the second relay SE2. Thus, the contact of the first relay is at hub d when the common conductor 41 is to be connected to the test bus, and at hub c when the common conductor 41 is to be connected to the second relay SE2. It should be noted that. conductor 41 is a pair conductor, so the poles of the relays are pairs accordingly.

'* · *. The second relay SE2 connects the first relay output terminal c to either terminal a or b. Terminal a, in turn, is connected to one of the ** · '·' wires of the switching matrix bus and terminal b to the other wire of this bus. In the figure, terminal a is connected to wire 1, which, on the other hand, is as described above; connected to a POTS splitter. Terminal b is connected to wire 2, which, on the other hand, as above se-30 (purchased; connected to ISDN splitter).

Similar switching arrangements are also made in UNIT 2, *. <but there the relay common wire can be connected to the next pair of wires in the switching matrix, i.e. wires 3 or 4. Similarly, in UNIT 3 the common wire can be connected to wires 5 or 6 and in UNIT 4 the common wire: Y: 35 can be connected to wires 7 or 8. Now, each wiring of the switching matrix bus is connected once and the wiring pattern starts again at UNIT 5, i.e. connecting to wires 1 or 2. When there are a large number of groups N, the outputs of the relays SE2 of the different groups can be connected stepwise to the for individual wires approximately 5 single interfaces.

Let's consider below how to change the subscriber interface to another type. Suppose the subscriber is a POTS subscriber. The subscriber's subscriber line is a pair cable SL3 ending in group UNIT1. Before changing the interface, the subscriber line SL3 is connected to the POTS-10 interface circuit 3 with the relay R3 in its normal position. From the interface circuit 3, which is one of the POTS cards 22, Fig. 5, the connection continues via bus 26 to the network connection group 210 and from there to the local exchange. When the subscriber has requested the operator to convert their current POTS interface to an ADSL interface, the operator proceeds as follows: A switch command is provided to the Node Testing Unit 211, FIG. 5, from a computer in the Network Control Management System (NMS). The test unit switches relay R3 to test position, relay SE1 to position c, and relay SE2 to position a, Figure 6. The result is that the access wire is connected to relay R3 and relay SE1 and SE2 to switch matrix bus conductor 1. This conductor, on the other hand, is connected to ADSL mode. 5. The POTS subscriber ':' 'interface has thus been changed to an ADSL interface. The POTS splitter 25 belonging to -20 m is connected to a conventional POTS interface circuit 25 on the one hand and an ADSL circuit on the other hand.

*: ·: Viewed from a subscriber's point of view, the data produced by the subscriber's terminal is: · encapsulated in the ADSL modem as an ADSL signal propagating through the subscriber line SL3 25 to group R3 of UNIT 1, Fig. 6. It prevents the signal to common line 41. Relay SE1 directs the signal to relay SE2 which again directs the signal to the switching matrix bus to · · · line 1. From line 1, the ADSL signal propagates to the POTS splitter 25, Fig. 5, and. , then on to the ADSL converter 27. The signal processed by the converter is then fed to the SDH network multiplexed with the other signals. If * · *: the subscriber speaks a standard landline call at the same time, it is disconnected in the POTS-: splitter 25 and further routed via the POTS interface circuit 24 to the telephone. network.

. ·. Data coming from the subscriber's network is processed in the ADSL circuit 27, '· * ·' 35 from where it is output as an ADSL signal via the POTS splitter 25, the switch matrix bus 1 and relays SE2, SE1 and R3 to the subscriber line SL3. If the subscriber receives an analog call at the same time, it is routed from the bus 29 to the POTS interface circuit 24. From there, the analog call is routed via the switch matrix bus conductor 1 and relays SE2, SE1 and R3 to the subscriber line SL3.

5 As described above, the POTS subscriber interface has been remotely converted to a POTS + ADSL interface. It should be noted, however, that the change reserves the common lead for the relays, so that the type of access for other subscriber lines in this group can no longer be changed remotely.

By way of further example, the case where an access circuit 2, which is an ISDN circuit, is connected to a subscriber line SL2 of a group UNIT 2 will be described by way of example. The subscriber has requested the operator to convert the subscription to an ADSL subscription. The data produced by the subscriber terminal in the ADSL modem is converted into an ADSL signal propagating through the subscriber line SL2 to the relay R2 of group UNIT 2, Fig. 6. It prevents the signal from accessing the ISDN interface circuit 2 by directing the signal to relays R 15 to common line 42. which in turn directs the signal via pin b 'to line 4 of the switching matrix bus 4. From line 4, the ADSL signal propagates to the ISDN splitter 26, FIG. If the subscriber simultaneously speaks an ISDN call, which may also be a data call, it is disconnected in the ISDN splitter 26 and further routed to the telephone network via the ISDN interface circuit 23.

The data coming from the subscriber's network must be processed in the ADSL circuit: "! 27, from where it is output as an ADSL signal by the ISDN splitter 25, connected via a rice bus 4 and relays SE22, SE12 and R2 to the subscriber line. from the wire network, it is routed from bus 29 to the ISDN interface circuit 23. From there, the call is routed via a switched matrix bus 4 and relays SE22, SE12 and R2 to the subscriber line SL2.

. . This is how the remote ISDN subscriber line has been changed to · · · 30 ISDN + ADSL subscriptions. Here too, the change reserves the common wiring of the relays of the UNIT 2 group, so that the other type of subscriber lines: subscriber lines coming into this same group can no longer be changed remotely according to the invention.

Only one subscriber line Päivi-35 tys can be made per group. Because of the large number of groups and the number of subscriber lines associated with each group, the probability of having two subscribers wishing for an update of the subscription is relatively small is shared. When such a situation occurs, the installer must come to the site to remotely switch the already remotely modified interfaces. At the same time, the test leads for the groups will be freed up, whereby the group 5 can again be accessed remotely.

The outputs of several groups of switching elements can be connected to one wire of the switching matrix bus. However, this results in a blocking effect because connecting one subscriber line to that line on the switching matrix bus prevents the connection of other groups of subscriber lines.

It is also possible to convert the POTS interface to an ISDN using the mechanism of the invention. This requires a connection from the POTS split blades 25 to the ISDN card 23 This connection is depicted by the dashed line 214 in Figure 5. In the light of the above examples, the upgrade is clear and is not illustrated herein.

The basic idea of the invention is simple: connect the subscriber line to a new bus instead of its actual connection circuit. Through the bus, the subscriber line signal is applied to the desired interface circuit. The implementation is done using the existing subscriber line connection mechanism for the test bus. As a new thing, except for a switching matrix bus, only a couple of switching elements per card 20 are needed. The cost of the switching elements is only a fraction of what the on-site visit costs.

The case of a subscriber line connected to an access node, which then has a backbone connection to the exchange, is described above. The application is in no way limited to it, but the invention can equally be applied to a case where: ·: ··· 25 subscriber lines are brought directly to the exchange.

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Claims (10)

A subscriber connection arrangement at a node in a telephone network to which several two-wire subscriber lines and via which subscriber terminals have access to the telephone network, and which node comprises: several subscriber connection circuits for an analogue subscriber connection (POTS) and several subscriber connection circuits of a first type for a digital subscriber connection (eg ISDN), each of which is connected to the end of a subscriber line and whereby it adapts the signal coming from the subscriber line to the telephone network and likewise adjusts the signal from the telephone network to a signal transmitted over the subscriber line, several test relays each located between the end of a subscriber line and a subscriber connection circuit, a test unit controlling the test relay to connect the end of the subscriber line either to the subscriber connection circuit or to a test bus through which the test unit performs the measurements of the subscriber line, d the test relays, and thus the subscriber lines, are divided into groups such that the respective test relays of each group can connect the subscriber lines to a common, conductive conducting test bus, the characteristic of which the node further comprises one of a plurality of conductor pairs of switching matrix bus to which several,,, 1 ..... 8) is permanently connected to a subscriber connection circuit (27) for a second digital subscriber connection of a second type which adapts the telephone network and the signal of the subscriber line, which is of the second type, to each other, to each of the groups (UNIT1, ... UNIT N) comprises a controllable coupling element (SE1.SE2; SE11, SE22; ... SE1N, SE2N) on the common; the same conduit (41, ... 4N) between the group test relays (R1, ..., Rn) and the test bus, which coupling element couples the common wire to a predetermined lead pair of the coupling matrix bus or to the test bus. 2. Subscriber connection arrangement according to claim 1, characterized in that when changing a subscriber line (eg SL3) connection type with test relay (R3) between the subscriber line and the subscriber connection circuit connected to this subscriber line, the subscriber line is connected to the common line (41). the controllable switching element (SE1, SE2) connects the common line to one of the switch matrix bus lines instead of the test bus, whereby the subscriber line (SL3) via the switch matrix bus is connected to a subscriber connection circuit for the digital subscriber connection of the other type. Subscriber connection arrangement according to claim 1, characterized in that the subscriber connection circuit (27) for the second type digital subscriber connection is an ADSL (Asymmetric Digital Subscriber Line) circuit. Subscriber connection arrangement according to claim 3, characterized in that the ADSL circuit is connected to the switching matrix bus via a first separator circuit (POTS Splitter 25) and a second separator circuit (ISDN Splitter 26) which separates the signal from the subscriber line separates the signal frequencies of the analogue subscriber connection (POTS) or the digital subscriber connection of the first type (ISDN) which is lower than the ADSL signal frequencies, and connection circuits (23 or 24) but leave the ADSL signal frequencies closer to the ADSL 15 connection circuit (27). Subscriber connection arrangement according to claim 1, characterized in that some of the bus conductors are permanently connected to connection circuits for the digital subscriber connection of the first type (eg ISDN), an analog subscriber connection (POTS) is changed to a digital subscriber - connection of the first type by means of a test relay (R3) between,.,. the subscriber line (SL) and the subscriber circuit connected thereto connect the subscriber line to the common line (41) and by coupling with the controllable switching element (SE1, SE2; SE11, SE22; SE1 N.SE2N). 1a, instead of connecting it to the test bus, to the line of the switching matrix bus, which is firmly connected to subscriber connection circuits for the digital subscriber connection of the first type (ISDN); 6. A subscriber connection arrangement according to claim 4, characterized in that the conductor of the switching matrix bus connects to the first and the second separating circuit (POTS Splitter 25, Splitter 26) in turn, and the controllable the coupling element (SE1.SE2; SE11, SE22; .. SE1N, SE2N) can connect the common line / ·: 35 (41, .. 4N) and, thus, the subscriber line, either to one of the coupling feed rice bus to the first separator circuit (POTS Splitter 25) wires permanently connected to conductors or to one of the wiring matrix bus connected to the other separator circuit (ISDN Splitter 26). The subscriber connection arrangement according to claim 2, characterized in that the subscriber connection type of the subscriber line is changed by remote use via the telephone network's network management system. Subscriber connection arrangement according to claim 7, characterized in that the test unit changes the subscriber connection type in response to a command from the telephone network's network management system. Subscriber connection arrangement according to claim 1, characterized in -10 characterized in that the controllable switching element consists of two relays, the first relay (SE1) connecting the common line (41) from the test relays (R) to the second relay (SE2). ) instead of the test bus and the other one alternates, alternatively, the common line connects to one of the two conductors of the switch matrix bus. Subscriber connection arrangement according to claim 4 or 7, characterized in that one of the wiring matrix bus conductors is permanently connected to the first disconnecting circuit (POTS splitter 25), wherein an analog subscriber connection can be changed to an ADSL connection, and the other of the wiring matrix bus is fixed. connected to the second separator circuit 20 (ISDN splitter 24), whereby an ISDN subscriber connection can be changed to a ...: ADSL connection. • · • · · · · · · · · · · · · · · · · · · ♦ · r <<I «« (· i · <« ·